According to the U.S. Environmental Protection Agency (EPA), upgrades in wastewater treatment over the last twenty years have significantly lowered the amount of nutrient pollution entering the Chesapeake Bay, effectively meeting the sector’s 2025 goals under the Chesapeake Bay Total Maximum Daily Load, or TMDL, a decade early.
Since 1985, nitrogen and phosphorus pollution from wastewater in the Bay watershed have decreased by 57 percent and 75 percent, respectively—this despite an increase in both population and the volume of wastewater to be treated. Thirty years ago, wastewater accounted for 28 percent of nitrogen pollution and 39 percent of phosphorus pollution; the sector now accounts for just 16 percent of the overall loads of each pollutant.
“The wastewater sector is leading the way at this point in our efforts to restore the Bay and local waters,” said EPA Regional Administrator Shawn M. Garvin in a release. “While we’ve reached a critical milestone in reducing pollution from wastewater plants, we need to keep up the momentum and ensure that other sectors do their share.” Garvin and other officials announced the news Tuesday at Blue Plains Advanced Wastewater Treatment Plant in Washington, D.C.
The Chesapeake Bay watershed, which includes portions of six states and D.C., is home to 472 municipal and industrial wastewater treatment plants. Over the last 30 years, improvements at the ten largest of these treatment plants have prevented 240 million pounds of nitrogen and 48 million pounds of phosphorus from flowing into the Bay.
Many residents of the region know that pollutants in rivers like the James, Potomac and Susquehanna can end up in the Chesapeake Bay. In fact, the Chesapeake Bay watershed—or the area of land over which water flows into the nation’s largest estuary—stretches from Cooperstown, New York, to Norfolk, Virginia. Less well known is the fact that the Bay’s so-called “airshed” extends much farther: particles of air pollution emitted as far away as Cincinnati, Ohio, can reach the waters of the Bay.
At 570,000 square miles, the Bay’s airshed is nine times as large as its watershed. Because pollution emitted into the air can be carried over long distances by wind and weather, it should come as no surprise that emissions associated with hydraulic fracturing operations in Pennsylvania and West Virginia have been found in Baltimore, Maryland, and Washington, D.C., or that emissions from gas, coal and oil-powered machines in Tennessee or North Carolina can lead to algae blooms in the waters of Maryland and Virginia.
Scientists estimate that one-third of the total nitrogen that pollutes the Bay comes from the air, often in the form of nitrogen oxides generated by power plants or machines. Through a process known as atmospheric deposition, six to eight percent of this airborne nitrogen falls onto the water directly, sometimes as dry particles and sometimes attached to raindrops, snowflakes or sleet. The rest falls onto the land, where it soaks into groundwater or washes into rivers and streams. Once in the water, nitrogen can fuel the growth of harmful algae blooms that create low-oxygen dead zones that suffocate marine life.
But there is evidence that regulations meant to curb air pollution are having a positive impact on our air and our water. In 2014, for instance, researchers with the University of Maryland Center for Environmental Science traced a drop in the amount of nitrogen found in some Maryland, Pennsylvania and Virginia waterways to the Clean Air Act. In 2015, the U.S. Environmental Protection Agency declared the drop in the atmospheric deposition of nitrogen observed in the region over the past two decades can also be attributed to the Clean Air Act. And in 2016, our own water quality modeling experts confirmed we are still seeing benefits of the Clean Air Act emerge as estimates of the atmospheric deposition of nitrogen continue to fall.
This means efforts to curb air pollution across the nation have curbed water pollution in our watershed. In 1985, an estimated 52.2 million pounds of nitrogen fell directly onto the region’s waters. Thirty years later, this number has dropped to 17.88 million pounds, and data show that pollution-reducing practices put in place between 2009 and 2015 in an effort to meet the Bay’s “pollution diet” have reduced the atmospheric deposition of nitrogen 20 percent.
More research is needed to understand the effects that nearly imperceptible bits of plastic, called “microplastics,” could have on underwater life in the Chesapeake Bay, according to a report from an advisory committee of scientific experts.
In response to growing concern surrounding microplastic pollution, the Chesapeake Bay Program’s Scientific and Technical Advisory Committee (STAC) was asked by the Chesapeake Bay Commission—a tri-state legislative body representing Maryland, Pennsylvania and Virginia—to investigate the issue. The resulting technical report provides information on the fate and transport of microplastics, potential impacts on wildlife, treatment options and the urgency of the issue.
Estimates suggest trillions of pieces of plastic persist in surface waters around the globe, including in the Chesapeake Bay. At five millimeters or less in size, much of this pollution is classified as microplastic. A subset of this category is microbeads: plastic particles roughly the width of a strand of hair that can be found in products like face wash, cosmetics and cleaning supplies.
Although the panel found more information is needed to understand the impacts of microplastics on underwater life, research is growing. Among the concerns is the ability of microplastics to accumulate chemical contaminants from the surrounding water, potentially exposing aquatic plants and animals to harmful chemicals.
According to the report, the simplicity of removing microbeads from products has helped propel regulations like the federal Microbead-Free Waters Act of 2015, which requires companies to stop using the beads in their products by 2017. But the report stresses that microbeads are just one type of microplastic, and that solving the greater issue would require the management of more than microbeads alone.
For a close-up look at microplastics from the Chesapeake Bay region, view our photo essay.
The report, Technical Review of Microbeads/Microplastics in the Chesapeake Bay, is available on the STAC website.
Water quality modeling experts have announced a drop in estimated nutrient and sediment loads entering the Chesapeake Bay. Computer simulations show that pollution controls put in place between 2009 and 2015 have reduced the amount of nitrogen, phosphorus and sediment entering the Bay by eight, 20 and seven percent. During the 2014 to 2015 reporting period alone, these controls reduced nitrogen, phosphorus and sediment loads by three, three and four percent. Experts attribute this drop to significant reductions of nitrogen and phosphorus in the wastewater sector, reductions in the atmospheric deposition of nitrogen as a result of the Clean Air Act and the increased implementation of agricultural conservation practices. Improved reporting and enhanced crediting of these practices have also generated a more accurate picture of the pollution entering rivers and streams from this sector.
Excess nitrogen, phosphorus and sediment impair water quality: nutrients can fuel the growth of algae blooms that lead to low-oxygen “dead zones,” while sediment can block sunlight from reaching underwater grasses and suffocate shellfish. The pollution load estimates discussed here are one in a suite of tools used to track progress toward our clean water goals, which include the pollution-reducing commitments of the Chesapeake Bay Total Maximum Daily Load.
Nutrient reductions in the wastewater sector account for 41 percent of the estimated Bay-wide nitrogen reductions and 38 percent of the estimated Bay-wide phosphorus reductions that took place between 2014 and 2015. Indeed, many large municipal wastewater treatment plants are removing more nitrogen from effluent than it was previously thought technology would allow.
Our picture of agricultural best management practices has also changed: cover crops have seen improved reporting, conservation tillage has seen increased implementation and nutrient management plans have become associated with increased nutrient reductions. Improved reporting and enhanced crediting allow computer simulations to show a more accurate picture of the pollution entering rivers and streams from the agricultural sector.
By incorporating the best available data into our computer simulations, we gain a more accurate picture of pollution in the watershed. This gives us a better understanding of the actions that are needed to restore water quality in our work toward an environmentally and economically sustainable watershed.
The Maryland portion of the Chesapeake Bay dead zone measured slightly smaller than average this past summer, supporting scientists’ June prediction of a smaller than average hypoxic zone in the nation’s largest estuary.
Dead zones are areas of little to no dissolved oxygen that form when nutrient-fueled algae blooms die and decompose. This decomposition process removes oxygen from the surrounding waters faster than it can be replenished, and the resulting low-oxygen conditions can suffocate marine life.
Each summer, the Maryland Department of Natural Resources (DNR) and the Virginia Department of Environmental Quality (DEQ) collect water samples to measure the hypoxic volume of the Bay. At 3,806 million cubic meters, the Maryland portion of this year’s dead zone was the 13th smallest in 31 years of sampling.
According to a report from the DNR, the size of the dead zone was likely due to reduced rainfall earlier this spring.
Today, the Chesapeake Bay Program unveiled a new, interactive story map—titled “Cleaner Air, Cleaner Bay”—showing how Clean Air Act regulations, as well as decades of enforcement actions, have led to a steady decline in air pollution across the Chesapeake region.
Polluted air can have quite an impact on the health of local waters: scientists estimate that one third of the nitrogen in the Bay comes from the air through a process known as atmospheric deposition. When our cars, power plants or other sources emit air pollution, it can be carried by wind and weather over long distances until it falls onto land or directly into the water.
Even pollution emitted thousands of miles away can eventually end up in our waterways. While the area of land that drains into the Bay spans six states and 64,000 square miles, the Bay’s “airshed”—the area of land over which airborne pollutants travel to enter the estuary—is nine times that size. Nearly three-quarters of the airborne nitrogen that eventually ends up in the Bay is generated by sources within this airshed, and the remaining 25 percent is emitted from sources even farther away. Which is why policies like the Clean Air Act have been essential in reducing the amount of pollution that reaches the Bay.
“We don’t often think about air as a source of pollution to Chesapeake Bay waters,” said Bay Program Director Nick DiPasquale. “The good news, as illustrated by this story map, is that we have been very successful in reducing airborne emissions through Clean Air Act regulations that have improved water quality in the Bay region.”
Excess nitrogen can fuel the growth of harmful algae blooms that block sunlight from reaching underwater grasses and create low-oxygen “dead zones” that suffocate marine life. In addition to national and local regulatory actions, pollution-reducing practices in backyards, in cities and on farms play a critical role in decreasing the flow of nitrogen.
Learn more about air pollution in the Bay region.
Faith plays an influential role in the lives of billions of people in the world, with about 84 percent identifying with a religious group. As Ramadan, a month-long ritual focused on self-purification and refocusing attention to faith, comes to an end for roughly 1.6 billion Muslims around the world, it is a good time to reflect on the intersection between conviction and nature.
Green Muslims, a Washington, D.C., based organization with the mission of helping their community live in the environmental spirit of Islam, began with a conversation between a group of friends about how to ‘green’ their Ramadan. At first they took small measures, like switching to reusable plates and having zero-trash iftars, or evening meals, when they could break their fasts. Those simple actions set off a chain reaction of stewardship within the community that led to the formal establishment of Green Muslims as a volunteer organization in 2007.
The nonprofit works with a number of different Muslim communities in the D.C. area, but serves as a national resource for those across the country that are looking to tie their faith back to the natural world. “There is really a passion and a yearning for learning more about what our tradition is amongst the Muslim community everywhere, and we hope to provide those resources and incubate that energy to take it to the next level,” said Colin Christopher, Executive Director of Green Muslims.
With many youths spending an increasing amount of time indoors, exposure to and connections with the natural world are lost, often times leading to rises in health problems like allergies and obesity. In a push to alleviate nature deficit disorder, Green Muslims launched the ‘Our Deen is Green’ Youth Outdoor Education Program this year. The program offers a wide range of field trips to places like the Chesapeake Bay, farms and conserved lands to demonstrate real life examples of how Islam and the environment are intertwined.
Each trip offers themed lessons that cover subjects such as, water, food waste and renewable energy. The goal of the program is to reconnect the participants with outdoor spaces and encourage healthy behavior changes, like wiser food choices and increased awareness about human impacts on the planet. “In Islam, we understand that God has an amount of trust in us as Khalifas, or stewards of the Earth. We really see our responsibility as people who need to conserve and protect the natural environment; we are called to do so, it’s our responsibility,” said Christopher.
The final trip of the year was to Rock Creek Park in Washington, D.C., where the kids toured the historic Peirce Mill and learned how the Earth’s natural processes like water flow and wind create energy that can be harnessed with minimal negative impacts to the environment. Prior to touring the mill, all eight kids sat contently in a circle making windmills out of paper and pencils while discussing where their energy comes from. “Why are we always talking about water?” asks a young boy. “Because we are made of water,” replies Christopher. A look of awe falls over the children’s faces. The importance of water is a theme that weaves through all lessons taught during the program.
The Qur’an has hundreds of verses that talk about water, animals, wind and the sun, and Sharia, or Islamic law, directly translates into ‘the pathway to the water source’—meaning that protecting water is of utmost importance in the tradition of Islam. “Every part of our natural environment is integral to the greater whole. In Islam, we talk about, if you have one limb that is unhealthy then the entire body is unhealthy and sick. So, the Chesapeake Bay is a really integral part of that entire ecosystem and we can’t afford to neglect the Bay or other parts of our ecosystem," explained Christopher.
Although the organization aims to spread awareness about the link between Islam and the environment, Christopher believes that diversity is the backbone of the Muslim community and welcomes anyone, regardless of faith, to volunteer and participate in Green Muslim events. “I think that the challenges we face relate to education. There is a lot of misinformation about Islam and what Islam is,” noted Christopher. “We are trying to bring back the teachings of our traditions within our community and explain that conservation, moderation and love for creation are core components of our tradition.”
To view more photos, visit the Chesapeake Bay Program’s Flickr page.
Images by Will Parson
Text by Jenna Valente
Scientists expect the Chesapeake Bay to see a slightly smaller than average dead zone this summer, due to reduced rainfall and less nutrient-rich runoff flowing into the Bay from the Susquehanna River this spring.
Dead zones are areas of little to no dissolved oxygen that form when nutrient-fueled algae blooms die and decompose. Resulting low-oxygen conditions can suffocate marine life. The latest forecast predicts an early-summer no-oxygen zone of 0.27 cubic miles, a mid-summer low-oxygen zone of 1.37 cubic miles and a late-summer no-oxygen zone of 0.28 cubic miles. This forecast, funded by the National Ocean and Atmospheric Administration (NOAA), is based on models developed at the University of Maryland Center for Environmental Science and the University of Michigan.
Nutrient pollution and weather patterns influence dead zone size. According to the U.S. Geological Survey (USGS), 58 million pounds of nitrogen entered the Bay in the spring of 2015, which is 29 percent lower than last spring’s nitrogen loadings.
Researchers with the Maryland Department of Natural Resources (DNR) and the Virginia Department of Environmental Quality (DEQ) will measure oxygen levels in the Bay over the next few months. While the final dead zone measurement will not take place until October, bimonthly updates on Bay oxygen levels are available through DNR’s Eyes on the Bay.
If you’ve ever watched a solitary ant explore your countertop, you might have marveled at its tiny size. You also might have questioned how something seemingly insignificant can be such a nuisance in your aspiringly sterile kitchen. Then you remember what your tiny pioneer heralds — the impending arrival of thousands of her sisters — and she suddenly seems like a more formidable adversary.
At a few millimeters short of a typical carpenter ant, microplastics are another case of both extreme smallness and overwhelming magnitude. Microplastics are the fragments, pellets, sheets, fibers, microbeads and polystyrene that begin as improperly discarded plastic bottles and trash that get washed into our waterways. At less than five millimeters in length, they are nearly imperceptible. But plastic doesn’t degrade like most organic material, meaning the total amount of plastic in the environment doesn’t really change as it breaks down, allowing microplastics to persist in most surface waters around the globe, including the Chesapeake Bay.
University of Maryland Professor Dr. Lance Yonkos is the primary author on a study of microplastics collected from four tributaries of the Chesapeake Bay — the Patapsco, Magothy, Rhode, and Corsica Rivers. Of the 60 samples taken by the National Oceanic and Atmospheric Association (NOAA) Marine Debris Program, all but one contained microplastics.
To Yonkos, it’s not really a surprise there are microplastics in the Bay.
“We have many of the prime sources for creating and introducing microplastics to aquatic environments,” Yonkos said. Roads are a main contributor because they promote physical degradation of plastics and provide easy transport via storm drains to Bay tributaries. Yonkos listed wastewater treatment plant effluent and substantial shipping traffic.
As plastic fragments become smaller, a greater number of animals are able to swallow them—as exemplified by the recent case of a whale killed by a shard from a DVD case. When these materials break down enough reach the level of microplastics, even filter feeders like oysters can consume them.
Smaller pieces also mean more surface area, Yonkos said, which could mean more leaching, either of chemicals from the plastic itself or of the environmental contaminants that cling to its surface.
“In this way, microplastics might serve as a vehicle for introducing bioaccumulative contaminants to the food chain,” Yonkos said. The concentration of such toxic contaminants can become magnified at higher levels of the food web.
But, the science isn’t clear yet on whether microplastics represent a serious environmental or human health concern.
“Since we don’t really know yet, it is a little disconcerting to think that most of the plastics we have created over the past 70 years are still in the environment,” Yonkos said.
And microplastics are here to stay. With no feasible method for removing microplastics that are already in the environment, measures like improved recycling and decreased use of offending products — like those that include microbeads, which would be banned by the state of Maryland according to legislation passed recently — could improve the situation going forward.
“The take home message is prevention,” Yonkos said. “If we want to reduce microplastics in the oceans we need to limit their release at the source.”
To view more photos, visit the Chesapeake Bay Program's Flickr page.
A new report from an advisory committee of scientific experts recommends the Chesapeake Bay Program’s Watershed Model be adjusted to better account for the influence of stream corridors and tree canopy on pollution from urban areas.
In the report, experts from the Bay Program’s Scientific and Technical Advisory Committee (STAC) suggest accounting for the effects of stream corridors and urban trees to improve the model’s accuracy and allow managers to better target pollution-reducing best management practices.
Trees and stream corridors interact with nutrient and sediment pollution in ways that are unique compared to other urban land covers, the study suggests. The erosion of stream channels can significantly increase the amount of sediment pollution associated with an urban area, while trees can help reduce the volume of polluted runoff.
The Watershed Model is used by Bay Program partners and stakeholders to estimate the amount of nutrients and sediment reaching the Bay. The model currently includes three urban land use categories: impervious (paved) surfaces like buildings, roads or parking lots; pervious (porous) surfaces like lawns or landscaping; and construction sites.
While pollution controls put in place over the last five years have lowered the amount of nutrients and sediment entering the nation’s largest estuary, new data show that agricultural sources have sent more nitrogen and sediment into the Bay since 2007 than previously thought.
Excess nitrogen, phosphorus and sediment can impair water quality: nitrogen and phosphorus can fuel the growth of harmful algae blooms, while sediment can suffocate shellfish and block sunlight from reaching underwater plants.
Each year, the seven watershed jurisdictions report the steps they have taken to lower the nutrients and sediment entering rivers and streams. Bay Program experts run this information through a suite of computer simulations, which generate pollution load estimates that show us how far our partners have come toward meeting the Bay’s “pollution diet.” When bolstered with new data on population size, land use and agricultural commodities, these simulations show a drop in pollution since 2009—including a six percent drop in nitrogen, an 18 percent drop in phosphorus and a 4 percent drop in sediment—but a two percent rise in nitrogen and sediment loads between 2013 and 2014.
A shift in agricultural commodities could explain this rise in nitrogen and sediment loads. According to data from the U.S. Department of Agriculture’s Census of Agriculture, several states have seen a surge in corn plantings since 2007. Because corn requires nitrogen-rich fertilizer that can leach off the ground and into local waterways, more corn plantings led to more nitrogen loadings than anticipated when pollution targets and reduction milestones were set.
The Bay Program uses the best possible data and information to track our progress toward restoring water quality. By incorporating new data into our computer simulations and pollution load estimates, we are allowed a more accurate picture of pollution in the watershed and a better understanding of the actions that are needed to reach our clean water goals. Because these computer simulations generate pollution load estimates using long-term average weather conditions, it’s possible for these estimates to differ from those that are based on water quality monitoring data; the latter can vary with the amount of rainfall in a given year.
“Each year, we employ the most current data and up-to-date science [to] offer the highest quality information to the public on pollution reductions resulting from Chesapeake Bay Program partners’ continued efforts. While we… have a lot of work to do… we are making steady progress toward meeting water quality goals,” said Bay Program Director Nick DiPasquale in a media release.
These pollution load estimates are just one in a suite of tools the U.S. Environmental Protection Agency (EPA) uses to evaluate whether jurisdictions are on track to meet the Total Maximum Daily Load (TMDL) and its two-year milestone commitments. The EPA also considers data and information on best management practice implementation, best management practice effectiveness and jurisdictions’ progress toward putting programs in place to achieve pollution cuts. It is expected to release interim assessments of jurisdictions’ work in May and conduct the next full two-year assessment in 2016.
When too much nitrogen enters the Chesapeake Bay, it can fuel the growth of harmful algae blooms that block sunlight from reaching underwater grasses and create low-oxygen areas, or “dead zones,” that suffocate marine life. But some key successes in curbing the amount of nitrogen entering local waterways have a potentially surprising source—the Clean Air Act.
In a factsheet released last week, the U.S. Environmental Protection Agency (EPA) outlines how declines in air pollution have substantially reduced the amount of airborne nitrogen that ends up in the Bay, helping the agency and its partners stay on track to meet the water quality goals of the Total Maximum Daily Load (TMDL), or “pollution diet,” which representatives from across the Bay region recommitted to achieving as part of the Chesapeake Bay Watershed Agreement.
Polluted air can have quite an impact on the health of local waters: scientists estimate that one third of the nitrogen in the Bay comes from the air through a process known as atmospheric deposition. When our cars, power plants or other sources emit air pollution, it can be carried by wind and weather over long distances until it falls onto land or into the water.
“Atmospheric deposition falls everywhere on the Chesapeake watershed, from forests, to fields, to parking lots,” said Lewis Linker, modeling coordinator with the Chesapeake Bay Program. “When this load of nitrogen is reduced, it improves water quality everywhere from stormwater runoff, to small headwater streams, …to the Chesapeake Bay.”
Even pollution emitted thousands of miles away can eventually end up in our waterways. While the area of land that drains into the Bay spans six states and 64,000 square miles, the Bay’s “airshed”—the area of land over which airborne pollutants travel to enter the estuary—is nine times that size. Nearly three-quarters of the airborne nitrogen that eventually ends up in the Bay is generated by sources within this airshed, and the remaining 25 percent is emitted from sources even farther away. Which is why, says Linker, national policies like the Clean Air Act are essential in reducing the amount of pollution that reaches the Bay.
“To restore the Chesapeake, the citizens of the Chesapeake watershed have done a lot of bootstrapped cleanup in their own backyards and watersheds,” said Linker. “But when it comes to atmospheric deposition of nitrogen, the reduction can’t be done by the Chesapeake state partners alone—it’s a job for the whole nation.”
For more on what you can do to curb air pollution, Take Action.
Learn more about the EPA’s efforts to curb nitrogen deposition in the Chesapeake.
The amount of nutrient and sediment pollution that flowed from nine major rivers into the Chesapeake Bay remained below the 25-year average in 2013. While scientists expect this to have a positive impact on the long-term health of the nation’s largest estuary, much of the Bay’s tidal waters remain impaired: between 2011 and 2013, just 29 percent of the water quality standards necessary to support underwater plants and animals were achieved.
Excess nutrients and sediment are among the leading causes of the Bay’s poor health. Nitrogen and phosphorus can fuel the growth of harmful algae blooms that lead to low-oxygen “dead zones” that suffocate marine life. Sediment can block sunlight from reaching underwater grasses and suffocate shellfish. Lowering the amount of nutrients and sediment moving from our streets, lawns and farm fields into the water is a critical step in the restoration of the Bay, and scientists have attributed the below-average pollution loads of 2013 to below-average river flow and the pollution-reducing practices our partners have put in place on the land.
Because pollution in our rivers has a direct impact on water quality in the Bay, the Chesapeake Bay Program tracks both environmental indicators to gain a wider picture of watershed health.
Pollution loads and trends
Our partners at the U.S. Geological Survey (USGS) monitor nutrient and suspended sediment loads delivered from the large watersheds located upstream of nine river monitoring stations to the Chesapeake Bay. Together, these stations—which are located on the Appomattox, Choptank, James, Mattaponi, Pamunkey, Patuxent, Potomac, Rappahannock and Susquehanna rivers—reflect loads delivered to the Bay from 78 percent of its watershed. Data show that nutrient and sediment loads measured in water year 2013 were below the long-term average.
Water quality standards achievement
The Chesapeake Bay Program measures progress toward the achievement of water quality standards in the Bay and its tidal tributaries using three environmental factors: dissolved oxygen, water clarity or underwater grass abundance, and chlorophyll a. Data are assessed in three-year periods. After more than a decade of steady improvement between 1989 and 2002, the attainment of water quality standards has seen mixed results. Changes seen in the past 10 years have not been statistically significant, and it is likely that the slow recovery of underwater grasses in the Upper Bay has stalled some water quality improvements.
Underwater grasses offer important habitat to underwater species and have a direct impact on water quality: healthy bay grass beds add oxygen to the water, absorb nutrient pollution, reduce wave energy and help suspended and potentially light-blocking particles like sediment settle to the bottom. Between 2009 and 2012, unfavorable growing conditions caused bay grasses to decline across the region. In 2011, for instance, heavy rains and the resulting runoff clouded the water during the spring growing season. That fall, Hurricane Irene and Tropical Storm Lee muddied the water again. Because water quality is reported in three-year assessment periods—and the most recent assessment period spanned 2011, 2012 and 2013—it is likely this drop in bay grass abundance influenced water quality results. But bay grasses have shown resilience: a dense bed on the Susquehanna Flats persisted through the storms of 2011, and showed how resilient such grass beds can be to disturbances in water quality. If bay grasses continue the recovery that took place in 2013, there could be positive effects across the wider Bay ecosystem.
For the uninitiated, paddling the Anacostia River in Washington, D.C., provides an opportunity to discover a hidden natural gem. Paddling away from the riverbank on an early fall evening, we quickly begin to slide past egrets hunting in the shallows and turtles diving deep to avoid our canoe. Joining them is a kingfisher, chattering as it circles before landing on a branch, and a bald eagle, following the course of the river upstream and disappearing around a bend. Moments like this are why the Anacostia Watershed Society (AWS) hosts free paddle nights like the one at Kenilworth Park in D.C. — to change perceptions of a river with a reputation of being heavily polluted.
“From the perspective of someone who’s heard about the river but never been there, I think the most surprising thing is that there’s a whole lot of nature,” says Lee Cain, Director of Recreation at AWS. “When you get out there, there’s some places where you’re there and you think, ‘Am I in the middle of West Virginia?’”
Cain says he heard many negative stories about the Anacostia River before visiting it for the first time, but his perceptions changed after experiencing it up close. The Anacostia is indeed still plagued by trash, sewage, toxins and runoff. But it is also a place where Cain has seen fox and deer swimming across the river, where egrets aggregate by the dozens at nighttime, and where bald eagles and osprey lay their eggs in March so their fledglings can feed on shad. In June, the 9-mile Anacostia Water Trail officially opened, featuring many natural areas and recreation sites along the river.
“You’re probably going to see a higher density of wildlife on this river than you might in even the Jug Bay wetlands,” says Cain.
Cain says the Anacostia is better than it was 25 years ago, when cars, refrigerators and tires were the big items being pulled from the river. Positive signs of change have come in the form of a plastic bag fee passed by the D.C. Council in 2009, and a ban on plastic-foam food containers that passed in June. A group called Groundwork Anacostia River DC has implemented litter traps in several tributaries, and AWS operates a trash trap study as well. The Anacostia Revitalization Fund, established in 2012, has provided funding for local initiatives aimed at restoring the river’s health. DC Water’s $2.6 billion Clean River Project will remove 98 percent of combined sewer overflows to the Anacostia by 2022, keeping 1.5 billion gallons of diluted sewage from entering the Anacostia every year. And the Pepco Benning Road Power Plant, which ran on coal then oil for over a century, sits quietly near the Anacostia, shuttered since 2012 and slated for demolition.
“If [the power plant] has some source of PCB contamination then at least that source is gone and now, when we clean out the soil, we’ll have a pretty clean space,” says Cain.
He says it has been a big year for toxins in the river, with the District of Columbia taking core samples along the river to assess what is down there and what it will cost for removal.
“One thing that’s encouraging is that it took us a couple centuries to sort of destroy this river, and then it’s only taken us about 25 years to get it to where it is now,” says Cain. “So you can imagine in another 25 years where it will be.”
In the meantime, AWS will continue working toward the goal of a fishable and swimmable Anacostia by 2025. Getting people on the Anacostia on paddle nights is just one effort to let people see firsthand what it already has to offer. The hope is that some of those visitors might become volunteers with AWS’ or their partners’ trash, stewardship, education and other programs.
“There’s a lot of the Anacostia that’s not exactly accessible to people, and in order to have all of these things and these efforts continue we need the support of the public,” says Cain. “We need people to recognize that this is a resource worth saving.”
To view more photos, visit the Chesapeake Bay Program Flickr page.
The nation’s forests save more than 850 lives each year, according to a new report from the U.S. Forest Service.
Image courtesy craigcloutier/Flickr
In a study that will be published in the October issue of Environmental Pollution, scientists with the U.S. Forest Service have determined the magnitude and economic value of the effects trees have on air quality and human health. While we have long known that trees remove pollutants from the air, this study shows that in 2010, trees in the conterminous United States removed 17.4 million tons of pollution, with a human health value of $6.8 billion.
In addition to saving more than 850 lives, these trees reduced more than 670,000 incidences of acute respiratory symptoms and 430,000 incidences of asthma exacerbation. Trees also saved 200,000 lost days of school.
Image courtesy pavlinajane/Flickr
A forest’s pollution removal rates can be affected by pollution concentrations, tree cover, weather conditions, length of growing season and other environmental stressors. In general, scientists found that while trees’ pollution removal was greater in rural areas, the economic value of this pollution removal was greater in urban areas. In other words, because of their proximity to people, trees in urban areas have a greater impact on human health.
“More than 80 percent of Americans live in urban areas containing over 100 million acres of trees and forests,” said Michael T. Rains, director of the Forest Service’s Northern Research Station in a media release. “This research clearly illustrates that America’s urban forests are critical capital investments [that are] helping produce clean air and water [and] reduce energy costs and making cities more livable. Simply put, our urban forests improve people’s lives.”
The Chesapeake Bay Program has set a goal to expand urban tree canopy by 2,400 acres by 2025. Indeed, trees can improve air quality, water quality and habitat in ways not discussed in this study. Trees near buildings, for instance, lower energy use. Trees along rivers and streams reduce the amount of nutrients entering local waterways. And trees provide food, shelter, nesting sites and safe migration paths for critters in the water and on land.
“Urban tree planting is part of the Watershed Improvement Plan for six Bay jurisdictions,” said U.S. Forest Service Chesapeake Liaison Sally Claggett. “To reach water quality goals, these jurisdictions are targeting nearly 20,000 acres of new tree canopy by 2025—so the goal of 2,400 acres may be reached early. Partners are planning an Urban Forestry Summit in fall 2014 to help make that happen.”
Solar energy is on the rise in the United States, and one jurisdiction in the Chesapeake Bay watershed has been named a leader in the solar energy revolution.
Image courtesy Mountain/\Ash/Flickr
According to a report released by Environment America, Delaware is one of the ten states that have installed the greatest amount of solar energy capacity per capita. At 82 watts per person, the state is in seventh place.
Since December 2008, Delaware has expanded its solar capacity from 2 to 59 megawatts. According to the Department of Natural Resources and Environmental Control (DNREC), the state has installed 1,600 solar energy systems on government buildings, businesses, schools and homes. What's driving this effort? Legislation, policies and financial incentives that support going solar.
Image courtesy Pacific Northwest National Library/Flickr
Solar energy uses the sun as fuel to create heat or electricity. It’s considered cleaner than coal- or natural gas-fired power plants because it doesn’t burn fossil fuels, which can release emissions that contribute to climate change.
Like other states in Environment America’s top ten, Delaware’s interconnection policies make it easier for individuals and companies to connect their solar energy systems to the power grid. Solar rebates and other financing options help lower the cost of installation, while "net metering" policies compensate consumers for the excess energy they return. The solar market is also moving forward in response to Delaware’s Renewable Portfolio Standard, which calls for the state to draw 25 percent of its power from renewable sources by 2025, with at least 3.5 percent coming from solar.
“Encouraging solar power is the right thing to do for the environment and our economy,” said Delaware Gov. Jack Markell in a media release. “We are aggressively working toward a clean energy future in Delaware, demonstrating we can have both a strong economy and a healthy environment. That means creating a robust market for solar and other clean energy systems, creating clean energy jobs, expanding our solar industry and improving air quality.”
Two additional watershed jurisdictions received special mention in Environment America’s report: New York, whose solar energy market is growing quickly, and the District of Columbia, where new clean energy policies are set to make solar more attractive and accessible to consumers.
During summer months, Chesapeake Bay waters become home to a range of bacteria. One of the most talked-about bacteria is Vibrio, which occurs naturally in warm estuarine waters and can infect those who eat contaminated shellfish or swim with open wounds in contaminated waters. But illness can be avoided. Learn about the bacteria—and how to avoid infection—with this list of five Vibrio facts.
Image courtesy CDC/Wikimedia Commons
1. Vibrio is a naturally occurring bacteria. There are more than 80 species of Vibrio, which occur naturally in brackish and saltwater. Not all species can infect humans, but two strains that can have raised concern in the Bay watershed: Vibrio vulnificus and Vibrio parahaemolyticus. The bacteria are carried on the shells and in the bodies of microscopic animals called copepods.
2. The presence of Vibrio in surface waters is affected by water temperature, salinity and chlorophyll. Because Vibrio prefers warm waters, it is not found in the Bay during winter months. Instead, it is common in the summer and early fall. When water temperatures are warm, algae blooms form, fed by nutrients in the water. These blooms feed the copepods that carry the Vibrio bacteria. When the copepods die, Vibrio bacteria are shed into the water. As climate change increases the temperature of the Bay, both algae blooms and Vibrio could persist later in the season.
3. Vibrio infections can occur in people who eat raw or undercooked shellfish or who swim with open wounds or punctures in contaminated waters. While infections are rare, they do take place and can be particularly dangerous for people with compromised immune systems. The ingestion of Vibrio can cause vomiting, diarrhea and abdominal pain, and in some cases can infect the bloodstream. If an open wound or puncture comes into contact with the bacteria, the area around the wound can experience swelling, redness, pain, blistering and ulceration of the skin.
4. Infection can be avoided. To avoid Vibrio infection, follow these tips:
5. Vibrio symptoms can start 12 to 72 hours after exposure. If you think you’ve been infected with Vibrio, seek medical attention. Make sure to let your doctor know that you have eaten raw or undercooked shellfish or crabs or have come into contact with brackish or saltwater.
The R/V Rachel Carson is docked on Solomons Island. At 81 feet long, the red and blue research vessel stands out against the deadrise workboats that share the Patuxent River marina. Her mission today is to lead researchers from the University of Maryland Center for Environmental Science (UMCES) to the Chesapeake Bay’s dead zone.
Every summer, this so-called “dead zone” forms in the main stem of the Bay. The area of low-oxygen water is created by bacteria as they feed on algae blooms growing in nutrient-rich water. The dead zone persists through the warm summer months because the Bay is stratified into two layers: a surface layer of lighter, fresher water that mixes with the atmosphere, and a bottom layer of denser, saltier water, where oxygen depletion persists. These layers won’t mix until the cooler temperatures of autumn allow the surface waters to sink.
To find the dead zone, Director of Marine Operations and Rachel Carson Captain Michael H. Hulme takes us to one of the deep troughs that run down the center of the Bay. Geologic remnants of the ancient Susquehanna River, these troughs can reach up to 174 feet deep in an estuary whose average depth is just 21 feet. Hulme anchors offshore of Calvert Cliffs State Park.
The boat is equipped with a dynamic positioning system, which holds it in place regardless of wind or waves. This allows the captain to step away from the helm and offer his hands on deck. “Being able to hover over that [specific] latitude and longitude is what makes the Rachel Carson so unique,” said Hulme. It’s also one of the reasons the vessel is so useful to scientists, who often return to the same sampling site again and again over time.
UMCES Senior Faculty Research Assistant David Loewensteiner drops a CTD overboard. The oceanography instrument takes eight measurements per second, tracking conductivity, temperature and depth as it is lowered through the water. Connected to the ship with a cable, the CTD sends data to a laptop in the boat’s dry lab. We measure 2.04 mg/L of dissolved oxygen in surface water, and just 0.33 mg/L at 98 feet deep. Critters need concentrations of 5 mg/L or more to thrive; these are “classic dead zone” conditions.
Dead zones are bad for the Bay. Like animals on land, underwater critters need oxygen to survive. In a dead zone, immobile shellfish suffocate and those fish that can swim are displaced into more hospitable waters. “If you were a self-respecting fish and oxygen was [low], what would you do?” asked Bill Dennison, Vice President for Science Applications and Professor at UMCES. “Swim away.”
First reported in the 1930s, the appearance of the dead zone in the Bay is linked to our actions on land: as we replace forests with cities, suburbs and farms, we increase the amount of nutrients entering rivers and streams. This fuels the growth of algae blooms that lead to dead zones. “Hypoxia [or low-oxygen conditions] is driven by what we do on the watershed,” said UMCES Assistant Professor Jeremy Testa. “The Bay is naturally set up to generate hypoxia because of that [stratification] feature. That said… when there were no people here, there was not much hypoxia.”
While it is our actions on land that created the dead zone, it is our actions on land that can make the dead zone go away. Research has shown that certain pollution-reducing practices—like upgrading wastewater treatment plants, lowering vehicle and power plant emissions and reducing runoff from farmland—can improve the health of local rivers and streams. Scientists have also traced a decline in the duration of the dead zone from five months to four, which suggests that conservation practices gaining traction across the watershed could have very real benefits for the entire Bay.
To view more photos, visit the Chesapeake Bay Program Flickr page.
Images by E. Guy Stephens/Southern Maryland Photography. Captions by Catherine Krikstan.
According to evaluations released this week by the U.S. Environmental Protection Agency (EPA), Chesapeake Bay Program partners are collectively on track to meet the phosphorous and sediment reduction commitments outlined in the Bay’s “pollution diet,” or Total Maximum Daily Load (TMDL). Further reductions in nitrogen, however, will be needed if partners are to meet all of their upcoming pollution-reducing goals.
Every two years, federal agencies and the watershed jurisdictions—which include Delaware, the District of Columbia, Maryland, New York, Pennsylvania, Virginia and West Virginia—report on the progress made toward the pollution-reducing “milestones” outlined in their Watershed Implementation Plans (WIPs). These WIPs describe how each jurisdiction will reduce the nitrogen, phosphorous and sediment pollution entering rivers and streams, and are included as commitments in the partnership’s recently signed Chesapeake Bay Watershed Agreement. Jurisdictions have set a goal to have all essential pollution-reducing practices in place by 2025 in an effort to meet water quality standards in the watershed.
Nutrient and sediment pollution are behind some of the Bay’s biggest health problems. Excess nitrogen and phosphorous fuel the growth of harmful algae blooms, which result in low-oxygen dead zones that suffocate marine life. Suspended sediment blocks sunlight from reaching underwater plants and suffocates shellfish. But “best management practices” (or BMPs) like upgraded wastewater treatment technologies, improved manure management and enhanced stormwater management can help towns, cities and states lower the amount of pollution flowing into local waters.
The EPA will continue to oversee the watershed jurisdictions’ pollution-reducing efforts, and will offer further attention to some pollution sectors—including wastewater in Delaware and New York; agricultural runoff in Delaware, Pennsylvania and West Virginia; and urban and suburban runoff in Pennsylvania, Virginia and West Virginia—to ensure partners remain on track to meet their 2017 targets.
Scientists expect the Chesapeake Bay to see an above-average dead zone this summer, due to the excess nitrogen that flowed into the Bay from the Potomac and Susquehanna rivers this spring.
Dead zones, or areas of little to no dissolved oxygen, form when nutrient-fueled algae blooms die and decompose. The latest dead zone forecast predicts an early-summer oxygen-free zone of 0.51 cubic miles, a mid-summer low-oxygen zone of 1.97 cubic miles and a late-summer oxygen-free zone of 0.32 cubic miles. This forecast was funded by the National Oceanic and Atmospheric Administration (NOAA) and is based on models developed at the University of Maryland Center for Environmental Science (UMCES) and the University of Michigan.
Dead zone size depends on nutrient pollution and weather patterns. According to the U.S. Geological Survey (USGS), 44,000 metric tons of nitrogen entered the Bay in the spring of 2014. This is 20 percent higher than last spring’s nitrogen loadings, and will influence algae growth and dead zone formation this summer.
Researchers with the Maryland Department of Natural Resources (DNR) and the Virginia Department of Environmental Quality (DEQ) will measure oxygen levels in the Bay over the next few months. While a final dead zone measurement is not expected until October, DNR biologists measured a larger-than-average low-oxygen zone on their June monitoring cruise, confirming the dead zone forecast.
The U.S. Environmental Protection Agency (EPA) released its proposed Clean Power Plan this week, which EPA Administrator Gina McCarthy called a “vital piece” of President Obama’s plan to cut carbon pollution and slow the effects of climate change.
Image courtesy Rennett Stowe/Flickr
The Clean Power Plan aims to lower carbon emissions from the power sector to 30 percent below 2005 levels. According to the EPA, this would also cut emissions of particle pollution, nitrogen oxides and sulfur dioxide more than 25 percent, lowering asthma attacks and medical bills and working toward justice for the low-income communities that are hardest hit by air pollution.
Fossil-fueled power plants are the largest source of carbon pollution in the United States, accounting for one-third of our greenhouse gas emissions. Left unchecked, carbon pollution leads to rising temperatures and sea levels and changes in weather patterns, ecosystems and habitats. It also worsens smog, which affects the heart and lung health of children, older adults and people living in poverty.
“This is about protecting our health and our homes,” McCarthy said in a speech celebrating the plan’s release.
Image courtesy francescopratese/Flickr
The plan would give states the freedom to chart their own course toward their own goals. “There is no one-size-fits-all solution,” McCarthy said. Instead, states can “mix and match” methods of electricity production—whether it is a low-carbon or “no” carbon source like nuclear, wind or solar energy—and pollution control policies to ensure a “smooth transition to cleaner power.”
Comments on the proposal will be accepted for 120 days after its publication in the Federal Register. The EPA will host public hearings on the plan in Denver, Atlanta, the District of Columbia and Pittsburgh during the week of July 28, and will finalize the plan next June.
Raising oysters along the bed of the Potomac River could lower pollution and improve water quality, according to new findings that show “farm-raised” shellfish are a promising method of managing nutrients.
Image courtesy Robert Rheault/Flickr
Nutrient pollution from urban, suburban and agricultural runoff has long plagued the Potomac, whose watershed spans four states and the District of Columbia and has the highest population in the Chesapeake Bay region. Excess nutrients like nitrogen and phosphorous can fuel the growth of algae blooms, which block sunlight from reaching underwater grasses and create low-oxygen dead zones that suffocate marine life. While filter-feeding oysters were once plentiful in the river—capable of removing nutrients from the water—their numbers have dropped due to overfishing and disease.
In a report published in Aquatic Geochemistry, scientists with the National Oceanic and Atmospheric Administration (NOAA) and the U.S. Geological Survey (USGS) show that cultivating shellfish on 40 percent of the Potomac’s bottom would remove all of the nitrogen now polluting the river. While conflicting uses—think shipping lanes, buried cables and pushback from boaters and landowners—mean it is unlikely that such a large area would be devoted to aquaculture, putting even 15 to 20 percent of the riverbed under cultivation would remove almost half of the incoming nitrogen. The combination of aquaculture and restored reefs could provide even greater benefits.
Image courtesy Virginia Sea Grant/Flickr
Shellfish aquaculture could also have benefits outside the realm of water quality: the shellfish could serve as a marketable seafood product, while the practice could provide growers with additional income if accepted in a nutrient trading program. Even so, the report notes that aquaculture should be considered “a complement—not a substitute” for land-based pollution-reducing measures.
“The most expedient way to reduce eutrophication in the Potomac River estuary would be to continue reducing land-based nutrients complemented by a combination of aquaculture and restored oyster reefs,” said scientist and lead study author Suzanne Bricker in a media release. “The resulting combination could provide significant removal of nutrients… and offer innovative solutions to long-term persistent water quality problems.”
At present, there are no aquaculture leases in the Potomac’s main stem. But in 2008, Maryland passed a plan to expand aquaculture in the region, and in 2009, NOAA launched an initiative to promote aquaculture in coastal waters across the United States.
The duration of the Chesapeake Bay’s annual “dead zone” has declined over time, according to research published last month in the scientific journal “Limnology and Oceanography.”
First reported in the 1930s, the Bay’s dead zone, or conditions of low dissolved oxygen also known as hypoxia, results from excess nutrients, which fuel the growth of algae blooms. As these blooms die, bacteria decompose the dead algae. This decomposition process removes oxygen from the surrounding waters faster than it can be replenished, suffocating marine life. While intensified agriculture and development continue to push nutrients into rivers and streams, research by Yuntao Zhou and others shows the duration of the Bay’s dead zone decreased from five months to four months between 1985 and 2010, and the end of the hypoxic season moved up from October to September. This could suggest that efforts to manage nutrient loads—through upgrades to wastewater treatment plants, cuts to vehicle and power plant emissions and reductions to runoff from farmland—are working.
This same research showed no change in the average onset of the Bay’s dead zone or for its average volume, whose peak has moved from late to early July. In other words, while the duration of the Bay’s dead zone has declined, its size and severity have not.
While Zhou points out that nutrient pollution is the foremost factor that fuels the development of our dead zone, his research also shows that weather patterns can act as an additional driver. Northeasterly winds, for instance, can create conditions that reinforce the separation between the Bay’s fresh and saltwater, leading to larger hypoxic volumes.
Pollution-reducing practices can improve water quality in the Chesapeake Bay and have already improved the health of local rivers and streams, according to new research from the Chesapeake Bay Program partnership.
In a report released today, several case studies from across the watershed show that so-called “best management practices”—including upgrading wastewater treatment technologies, lowering vehicle and power plant emissions, and reducing runoff from farmland—have lowered nutrients and sediment in local waterways. In other words, the environmental practices supported under the Clean Water Act, the Clean Air Act and the Farm Bill are working.
Excess nutrients and sediment have long impaired local water quality: nitrogen and phosphorous can fuel the growth of algae blooms and lead to low-oxygen “dead zones” that suffocate marine life, while sediment can block sunlight from reaching underwater grasses and suffocate shellfish. Best management practices used in backyards, in cities and on farms can lower the flow of these pollutants into waterways.
Data collected and analyzed by the Bay Program, the University of Maryland Center for Environmental Science (UMCES) and the U.S. Geological Survey (USGS) have traced a number of local improvements in air, land and water to best management practices: a drop in power plant emissions across the mid-Atlantic has led to improvements in nine Appalachian watersheds, upgrades to the District of Columbia's Blue Plains Wastewater Treatment Plant have lowered the discharge of nutrients into the Potomac River and planting cover crops on Eastern Shore farms has lowered the amount of nutrients leaching into the earth and reduced nitrate concentrations in groundwater.
“In New Insights, we find the scientific evidence to support what we’ve said before: we are rebuilding nature’s resilience back into the Chesapeake Bay ecosystem, and the watershed can and will recover when our communities support clean local waters,” said Bay Program Director Nick DiPasquale in a media release.
But scientists have also noted that while we have improved water quality, our progress can be overwhelmed by intensified agriculture and unsustainable development, and our patience can be tested by the “lag-times” that delay the full benefits of restoration work.
“This report shows that long-term efforts to reduce pollution are working, but we need to remain patient and diligent in making sure we are putting the right practices in place at the right locations in Chesapeake Bay watershed,” said UMCES President Donald Boesch in a media release. “Science has and will continue to play a critical role informing us about what is working and what still needs to be done.”
UMCES Vice President for Science Applications Bill Dennison echoed Boesch’s support for patience and persistence, but added a third P to the list: perspiration. “We’ve got to do more to maintain the health of this magnificent Chesapeake Bay,” he said.
“We’ve learned that we can fix the Bay,” Dennison continued. “We can see this progress… and it’s not going to be hopeless. In fact, it’s quite hopeful. This report makes a good case for optimism about the Chesapeake Bay.”
The reduction of power plant emissions in the mid-Atlantic has improved water quality in the Chesapeake region, according to new research from the University of Maryland Center for Environmental Science (UMCES).
Image courtesy haglundc/Flickr
Researchers at the university’s Appalachian Laboratory have traced improvements in the water quality trends of nine forested watersheds located along the spine of the Appalachian Mountains to the Clean Air Act’s Acid Rain Program. Passed in 1990, the Acid Rain Program led to a 32 percent drop in human-caused nitrogen-oxide emissions in 20 states. As these emissions have declined, so too has the amount of nitrogen found in some Pennsylvania, Maryland and Virginia waterways.
In other words, while the Acid Rain Program only intended to reduce the air pollution that causes acid rain, it had the unintended consequence of reducing the amount of nitrogen oxide particles landing on the region’s forests, thus improving local water quality.
“Improvements in air quality provided benefits to water quality that we were not counting on,” said UMCES President Donald Boesch in a media release.
Once nitrogen oxide particles are emitted into the air, wind and weather can carry them long distances. In time, these particles fall onto the land or into the water. Nitrogen that enters rivers and streams can fuel the growth of algae blooms, which block sunlight from reaching underwater grasses and create low-oxygen “dead zones” that suffocate marine life. Scientists estimate that just over one-third of the nitrogen polluting the Bay comes from the air.
Slow-moving groundwater on the Delmarva Peninsula could push excess nutrients into the Chesapeake Bay even after we have lowered the amount of nitrogen and phosphorous we put onto the land.
Image courtesy yorgak/Flickr
According to new research from the U.S. Geological Survey (USGS), most of Delmarva is affected by the slow movement of nutrients from the land into the water. A USGS model developed to track the movement of nitrogen through the region showed that groundwater—and the pollutants it can contain—takes an average of 20 to 40 years to flow through the peninsula’s porous aquifers into rivers and streams. In some parts of Delmarva, the groundwater that is now flowing into local waterways contains nitrogen linked to fertilizer used three decades ago.
The slow flow of nitrogen-laden groundwater into the Bay could affect efforts to restore the watershed, lengthening the “lag-time” between the adoption of a conservation practice and the effect of that practice on a particular waterway. In other words, it could take days or even decades for today's management actions to produce positive water quality results.
“This new understanding of how groundwater affects water-quality restoration in the Chesapeake Bay will help sharpen our focus as many agencies, organizations and individuals work together to improve conditions for fish and wildlife,” said Lori Caramanian, Department of the Interior Deputy Assistant Secretary for Water and Science, in a media release.
While these findings seem to contradict the value of our restoration work, the study in fact indicates that pollution-reducing practices put in place over the past decade have begun to work. The study also confirms that rigorous steps taken to reduce nutrients on the land will lower the amount of nitrogen loading into streams in the future.
How poor are they that have not patience! What wound did ever heal but by degrees?
William Shakespeare, Othello, Act II, Scene 3
Between fast food restaurants and speed-of-light cell phones, we live in a culture of instant gratification. But the environment around us doesn’t operate that way. Instead, it is slow to respond to changes—like the upsets or imbalances created by human activity.
Scientific evidence shows that many of the pollution-reducing practices we are placing on the ground now may take years to show visible improvements in water quality. One reason? Pollutants can be persistent. French and Canadian researchers, for instance, tracked the movement of fertilizer through a plot of land over the course of three decades. While more than half of the fertilizer applied to the land in 1982 was absorbed by agricultural crops like wheat and sugar beet, 12 to 15 percent remained in the soil. The researchers predicted it would take an additional 50 years before the fertilizer fully disappeared from the environment.
Much of the farmland in the Chesapeake Bay watershed sits over groundwater, now contaminated with high levels of nitrates following years of fertilizer applications above ground. Work by the U.S. Geological Survey (USGS) has shown that it will take a decade for this nitrogen-laden groundwater to flow into rivers, streams and the Bay. On the Delmarva Peninsula, where deeper, sandy aquifers underlie the Coastal Plain, this so-called “lag-time” could take 20 to 40 years.
So what implications could lag-times have for the Bay restoration effort? Last year, the Chesapeake Bay Program’s Scientific and Technical Advisory Committee (STAC) released a report about the lag-time phenomenon. The team of experts concluded that lag-times will affect public perception of our progress toward meeting the pollution diet set forth by the Chesapeake Bay Total Maximum Daily Load (TMDL).
The TMDL requires the six Bay states and the District of Columbia to implement their proposed pollution-reduction measures by 2025. There may be an expectation on the part of the general public and our elected officials that once these measures are fully implemented, the Bay will have met its water quality goals. But now we know that it may take some time before we can make that claim. As 2025 approaches, we must remind the public that lag-times exist and ask for their patience in seeing a healthy Bay. Because through patience—and vigilance—the Bay will be restored.
Note: The opinions expressed above are those of the author and do not necessarily reflect U.S. EPA policy, endorsement, or action.
The Chesapeake Bay watershed is home to more than 17 million people, each of whom is reliant on water. But as populations grow and communities expand, we send pollutants into our rivers and streams, affecting every drop of water in the region. How, then, do so many of us still have access to clean water? The answer lies within wastewater treatment plants.
One plant, in particular, plays a pivotal role in the region’s water quality. Located in Washington, D.C., the Blue Plains Wastewater Treatment Plant has served the D.C. metropolitan area since 1983. The plant receives 40 percent of its flow from Maryland, 40 percent from the District and 20 percent from Virginia. With the capacity to treat 370 million gallons of sewage each day, it is the largest wastewater treatment plant in the world and the only one in the nation to serve multiple states.
Recently, the District of Columbia Water and Sewer Authority—also known as DC Water—made technological upgrades to Blue Plains. Evidence shows these upgrades have already accounted for reductions in nutrient pollution and a resurgence in the upper Potomac River’s bay grass beds. Indeed, putting new wastewater treatment technology in place is a critical step toward meeting the pollution limits established in the Chesapeake Bay Total Maximum Daily Load. As of 2012, 45 percent of the watershed's 467 wastewater treatment plants had limits in place that met water quality standards.
Because of spatial constraints, many of upgrades planned for Blue Plains will focus on intensifying the wastewater treatment process. According to Sudhir Muthy, innovation chief for DC Water, the more concentrated the purification process is, the more energy efficient the plant can be.
For decades, the philosophy behind wastewater treatment plants has been to imitate those clean water processes that you might see in natural systems. Lately, there has been a shift in thinking about how wastewater is treated. Murthy explains: “Now, more attention is given to using the energy created within the treatment process to run the plant. [For example,] carbon has a lot of energy and is created during the treatment process. We are trying to harness [carbon’s] energy to help the plant run in a more energy-efficient way. We are now asking: How do we optimize the use of energy within the wastewater treatment process?”
Blue Plains hopes to become energy neutral in 10 to 15 years, and upgrades to reduce pollution and save energy will continue for years to come. A new tunnel will allow both sewage and wastewater to flow from the District to the plant, where it will be treated to reduce the flow of polluted runoff into the Potomac River. And a new process will recycle “waste” heat to “steam explode” bacterial sludge, turning it into a biosolid that can be mixed with soil, used as fertilizer and generate extra revenue.
“All processes use energy,” Muthy said. “But if you can find ways to offset or recycle that energy use, then you can move towards being more efficient.”
The Chesapeake Bay’s dead zone measured near average in size this past summer, coming close to scientists’ June prediction of a smaller than average hypoxic zone in the nation’s largest estuary.
Dead zones, or areas of little to no dissolved oxygen, form when nutrient-fueled algae blooms die. The bacteria that aid in algae bloom decomposition suck up oxygen from the surrounding waters. The resulting hypoxic or anoxic conditions can suffocate marine life, shrinking the habitat available for fish, crabs and other critters.
Each summer, the Maryland Department of Natural Resources (DNR) and the Virginia Department of Environmental Quality (DEQ) collect water samples to measure the hypoxic volume of the Bay. Since 1983, this number has ranged from 15.3 to 33.1 percent. In 2013, it measured 22.1 percent: 5.6 percent higher than the previous year and just above the 21.9 percent average.
It is said that the environmental movement began with the first Earth Day. Four decades later, we have seen signs of environmental improvement: rivers no longer catch fire, chemical dumps have been cleaned up and we are breathing cleaner air. But even as we solve past environmental problems, we place renewed pressure on our ecosystem.
In the Chesapeake Bay watershed, our population has doubled over the past 60 years, reaching almost 18 million people. With that population increase comes a rise in polluted runoff from roads, parking lots and farm fields and more discharges from septic systems and wastewater treatment plants. These non-point sources of pollution push nutrients and sediment into our waterways, where they create algal blooms and low-oxygen dead zones, smother our underwater grasses and reduce fish habitat. Our actions on land continue to impact our environment, creating an ecosystem that is dangerously out of balance. Now, pollution is much more insidious.
When we look at the efforts made to restore the Bay and its watershed, we can see what works and what doesn’t. We know that technological upgrades to wastewater treatment plants can lower nitrogen and phosphorous discharges, improving water quality and, in some cases, boosting the growth of underwater grasses. We know that controls on power plant and vehicle emissions can reduce the atmospheric deposition of nitrogen, lowering nutrient pollution in the Bay. And there is evidence that planting cover crops, controlling fertilizer applications and restricting livestock from streams can reduce agricultural runoff and restore local waters.
While these actions demonstrate success, there are other actions that have not led to such improvements. But these experiences are equally important. The environment is a complex system, and what works in one location might not work as well in another. The same practice implemented in the Piedmont, for instance, will not create the same results as that practice implemented on the Coastal Plain. And some areas experience “lag-times” between the implementation of conservation practices and an improvement in water quality. Knowing what factors may cause these differences is important, so we can adjust our behavior and adapt our approaches to local conditions. As we work to restore the watershed, we must constantly ask ourselves, “What have we learned?” And we must know that how we apply these lessons will provide the key to restoring rivers, streams and the Bay.
Note: The opinions expressed above are those of the author and do not necessarily reflect U.S. EPA policy, endorsement, or action.
A federal judge ruled last week that the U.S. Environmental Protection Agency (EPA) can set pollution limits for the Chesapeake Bay, upholding the Total Maximum Daily Load (TMDL) that has guided water quality restoration efforts across the region since it was issued in 2010.
The TMDL, also known as the Bay “pollution diet,” set limits on the amount of nitrogen, phosphorous and sediment allowed to run into the Bay each year. It required the seven Bay jurisdictions to write Watershed Implementation Plans, which make clear the steps that each will take to reduce pollution from urban, suburban and agricultural runoff, wastewater treatment plants and other sources. Pollution-reducing practices are being put in place across the watershed, and are expected to help combat the excess nutrients and sediment plaguing the nation’s largest estuary.
In 2011, the American Farm Bureau Federation and the Pennsylvania Farm Bureau—who were soon joined by the Fertilizer Institute and a number of agricultural trade associations—filed suit against the EPA, claiming the federal agency lacked the authority to issue the so-called “arbitrary” and “capricious” TMDL. The Chesapeake Bay Foundation and several local and national partners intervened in the lawsuit to protect the cleanup. Pennsylvania Federal Judge Sylvia Rambo has ruled the plaintiffs failed to prove their case.
According to Rambo’s ruling, the Clean Water Act grants the EPA the authority to set pollution limits on impaired waters: “The [Clean Water Act] is an all-encompassing and comprehensive statute that envisions a strong federal role for ensuring pollution reduction… Considering the numerous complexities of regulating an interstate water body, EPA’s role is critical.”
An EPA spokesperson called the ruling “a victory for the 17 million people in the Chesapeake Bay watershed.”
More than 47,000 TMDLs have been issued for rivers, streams and other water bodies throughout the United States, but the Bay TMDL is the largest and most complex. Learn more on the EPA’s TMDL website.
Streams across the United States are suffering a decline in health, as human development alters stream flow and pushes pollutants into the water.
Between 1993 and 2005, scientists with the U.S. Geological Survey (USGS) sampled the algal, macroinvertebrate and fish communities in thousands of streams across the nation. According to a report released by the USGS National Water-Quality Assessment Program, the health of at least one of these three aquatic communities was altered in 83 percent of the streams assessed.
Healthy streams are critical to our communities. Streams provide drinking water, control floods, support commercial and recreational fisheries, and bring aesthetic value into our lives. But stream flow that is altered by human activities can impact native fish, and excess pollutants can alter plant and animal communities.
According to the USGS, tens of thousands of dams and diversions have contributed to the modification in stream flow of 86 percent of the waters assessed in this study. Excess nutrients have altered algal communities, while excess pesticides have had an adverse affect on macroinvertebrates, many of which can be harmed by the toxins found in insecticides.
But one in five streams in urban and agricultural areas was found to be in good health. This finding suggests that green development, on-farm conservation and other best management practices can help us maintain healthy streams alongside continued development.
Read more about the The Quality of Our Nation’s Waters.
Dead zones, or areas of little to no dissolved oxygen, form when nutrient-fueled algae blooms die. As bacteria help these blooms decompose, they suck up oxygen from the surrounding waters. The resulting hypoxic or anoxic conditions can suffocate marine life.
The Chesapeake Bay Program tracks dissolved oxygen as an indicator of water quality and Bay health.
The latest NOAA-funded forecast from researchers at the University of Maryland Center for Environmental Science (UMCES) and the University of Michigan predicts an average summer hypoxic zone of 1.108 cubic miles, lower than last year’s mid-summer hypoxic zone of 1.45 cubic miles.
This predicted improvement should result from the lower than average nutrient loads that entered the Bay this spring. According to the U.S. Geological Survey (USGS), 36,600 metric tons of nutrients entered the estuary from the Potomac and Susquehanna rivers, which is 30 percent lower than average.
The Bay’s dead zones are measured at regular intervals each year by the Maryland Department of Natural Resources (DNR) and the Virginia Department of Environmental Quality. While the final dead zone measurement will not take place until October, DNR biologists measured better than average dissolved oxygen on its June monitoring cruise, confirming the dead zone forecast.
Cover crops, streamside trees and nutrient management plans: all are exceptional ways to reduce nutrient pollution in the Chesapeake Bay. And for father and son duo Elwood and Hunter Williams, restoring the Bay begins with conservation practices and a shift in mentality.
“We knew coming down the road that we needed to do a better job with keeping the water clean,” Hunter said. “We decided that if there was going to be a problem with the streams it wasn’t going to be us.”
Excess nutrients come from many places, including wastewater treatment plants, agricultural runoff and polluted air. When nitrogen and phosphorus reach waterways, they can fuel the growth of large algae blooms that negatively affect the health of the Bay. In order to reduce these impacts, the U.S. Environmental Protection Agency (EPA) has implemented a Bay “pollution diet,” known as the Total Maximum Daily Load (TMDL).
Since the passing of the TMDL, many farmers in the watershed have felt the added pressure of the cleanup on their shoulders, but for the Williams family, having the foresight to implement best management practices (BMPs) just seemed like the environmentally and fiscally responsible thing to do.
”We don’t want to get to a point where regulations are completely out of control,” Hunter explained. “Farmers know what they’re putting on the ground so we have the ability to control it. Most people who have yards don’t have a clue what they’re putting on the ground when they use fertilizer. The difference has to be made up by the farmers because we know exactly what is going on to our soil.”
The Williams family began implementing BMPs on Misty Mountain Farm in 2006 by teaming up with the Potomac Valley Conservation District (PVCD). The government-funded non-profit organization has been providing assistance to farmers and working to preserve West Virginia’s natural resources since 1943.
The PVCD operates the Agricultural Enhancement Program (AgEP), which has steadily gained popularity among chicken farmers and livestock owners located in the West Virginia panhandle and Potomac Valley. While these two districts make up just 14 percent of West Virginia’s land mass, these regions are where many of the Bay’s tributaries begin—so it is important for area landowners to be conscious of pollutants entering rivers and streams.
AgEP is designed to provide financial aid and advice to farmers in areas that the Farm Bill does not cover. PVCD is run in a grassroots fashion, as employees collaborate with local farmers to pinpoint and meet their specific needs.
“It [AgEP] has been very well received,” said Carla Hardy, Watershed Program Coordinator with the PVCD. “It’s the local, state and individuals saying, “These are our needs and this is how our money should be spent.” Farmers understand that in order to keep AgEP a voluntary plan they need to pay attention to their conservation practices.”
Hunter admits the hardest part of switching to BMPs was changing his mindset and getting on board. Originally, Hunter was looking at the Bay’s pollution problems as a whole, but with optimistic thinking and assistance from PVCD, he realized that the best way to overcome a large problem was to cross one bridge at a time.
It wasn’t long before the Williams family started to see results: fencing off streams from cattle led to cleaner water; building barns to overwinter cows allowed them to grow an average of 75 pounds heavier than before, making them more valuable to the farm.
By using BMPs, the Williams family has set a positive example for farmers across the watershed, proving that with hard work and a ‘sky is the limit’ mentality, seemingly impossible goals can be met.
Hunter points out, “We are proud to know that if you are traveling to Misty Mountain Farm you can’t say, “Hey these guys aren’t doing their part.”
Video produced by Steve Droter.
Over the past decade, smallmouth bass in five Chesapeake Bay tributaries have suffered from fish kills and perplexing illnesses—and nutrient pollution could be to blame.
According to a new report from the Chesapeake Bay Foundation (CBF), excess nitrogen and phosphorous in our rivers and streams could be behind two of the leading problems affecting smallmouth bass: first, the rapid growth of fish parasites and their hosts, and second, the expansion of large algae blooms that can lead to low-oxygen conditions and spikes in pH. When paired with rising water temperatures and ever more prevalent chemical contaminants, nutrient pollution seems to have created a “perfect storm” of factors that are making smallmouth bass more susceptible to infections and death.
Image courtesy Mr. OutdoorGuy/Flickr
In a media call, CBF President Will Baker called the smallmouth bass “the canary in the coal mine for the Bay’s rivers.” Because the fish is sensitive to pollution, problems within the population could indicate problems within the Bay.
Smallmouth bass in the Susquehanna, Monocacy, Shenandoah, Cowpasture and South Branch of the Potomac rivers have seen a string of recent health problems, from open sores and wart-like growths to abnormal sexual development. In the Susquehanna, smallmouth bass populations have plummeted so far that Pennsylvania has made it illegal to catch the fish during spawning season.
“Our fish are sick, our anglers are mad and my board and I—protectors of our [smallmouth bass] fishery—are frustrated,” said John Arway, executive director of the Pennsylvania Fish and Boat Commission. “Our bass, and our grandchildren who will fish for them, are depending on us to fix the problem.”
Image courtesy CBF
While specific causes of smallmouth bass fish kills and illnesses remain unclear, CBF has called on state and local governments to accelerate their pollution-reduction efforts in hopes of improving water quality and saving the driving force behind a $630 million recreational fishing industry. The non-profit has also called on the federal government to designate a 98-mile stretch of the Susquehanna as impaired, which would commit Pennsylvania to reversing the river’s decline.
“This is the moment in time to save fishing in our streams and rivers, as well as the jobs and quality of life that are connected to it,” Baker said.
Nutrient and sediment trends at nine Chesapeake Bay monitoring sites have shown an overall lack of improvement, according to a report released this week by the U.S. Geological Survey (USGS).
As part of the Chesapeake Bay Program’s integrated approach to assess water quality as the Bay “pollution diet” is implemented, the report tracks changes in nitrogen, phosphorous and sediment trends at monitoring stations on the Susquehanna, Potomac and James rivers, as well as six additional waterways in Maryland and Virginia.
Using data from 1985 to 2010, the USGS measured minimal changes in total nitrogen at six out of nine monitoring stations and minimal or worsening changes in phosphorous at seven out of nine monitoring stations. Using data from 2001 to 2010, the USGS measured minimal or worsening changes in sediment at eight out of nine monitoring stations.
But a lack of improvement in pollution trends doesn’t mean that pollution-reduction practices aren’t working.
While nutrient and sediment trends can be influenced by a number of factors—among them, wastewater treatment plant upgrades and changes in land use—there is often a lag time between when restoration work is done and when visible improvements in water quality can be seen. And while the nine stations monitored here are located downstream of almost 80 percent of the land that drains into the Bay, runoff and effluent from three of the watershed’s biggest cities—Baltimore, Richmond, Va., and Washington, D.C.—do not flow past them, meaning that pollution-reduction practices implemented in these areas—or put in place after 2010—are not reflected in the study’s results.
According to the report, the USGS plans to work with partners to help explain the trends and changes described in this report; initial focus will be paid to the Eastern Shore and Potomac River Basin.
Read more about nutrient and sediment loads and trends in the Bay watershed.
Plumes of sediment, floating trash and pathogens that make once-swimmable water unsafe: pollution of all kinds continues to plague the Potomac River, as populations grow, pavement expands and stormwater runoff pushes various hazards into the 405-mile long waterway.
But for the Potomac Conservancy, a boost in incentives, assistance and enforcement just might save the nation’s river.
Image courtesy kryn13/Flickr
According to the advocacy group’s sixth annual State of the Nation’s River report, “too many stretches of the Potomac River are still too polluted to allow you to safely swim, boat or fish, or to support healthy populations of fish and other aquatic life.”
The cause? A “pending storm” of population pressure and development, said Potomac Conservancy President Hedrick Belin.
For Belin, more people means more development. More development means more pavement. And more pavement means more stormwater runoff.
The fastest growing source of pollution into the Chesapeake Bay, stormwater runoff is rainfall that picks up pollutants—in the Potomac River’s case, nutrients, sediment, pathogens and chemicals—as it flows across roads, parking lots, lawns and golf courses. It carries these pollutants into storm drains and rivers and streams, posing a threat to marine life and human health.
But cities and towns throughout the Potomac River basin are curbing stormwater runoff by minimizing their disturbances to the land. And it is this local, land-based action—the installation of rain barrels and green roofs, the protection of forests and natural spaces, the passing of pollution permits in urban centers—that the Conservancy thinks will push the river in the right direction.
In the report, the Conservancy calls on state and local decision-makers to strengthen pollution regulations, increase clean water funding and improve pollution-reduction incentives and technical assistance.
“The Potomac Conservancy is advocating for river-friendly land-use policies and decisions, especially at the local level,” Belin said. “Because defending the river requires protecting the land that surrounds it.”
Learn more about Troubled Waters: State of the Nation’s River 2012.
Nutrient and sediment levels at a number of Chesapeake Bay monitoring sites have improved since 1985, according to a report released by the U.S. Geological Survey (USGS). These improvements in long-term trends indicate pollution-reduction efforts are working.
By measuring nutrient and sediment trends and by tracking changes in water clarity, underwater grasses and other indicators of river and Bay health, the USGS and Chesapeake Bay Program partners can make a more accurate assessment of changes in our waters. This kind of on-the-water monitoring is an integral part of ensuring Bay states and the District of Columbia are meeting "pollution diet" goals.
Excess nutrients and sediment can harm fish, shellfish and underwater grasses. Nitrogen and phosphorous fuel the growth of algae blooms that later rob water of the oxygen that aquatic species need to survive; sediment clouds the water, blocking the sunlight that plants need to grow. But a number of practices, from upgrading wastewater treatment plants to reducing agricultural, urban and suburban runoff, can stop or slow nutrients and sediment from entering the Bay.
According to the USGS report, one-third of monitoring sites have shown improvement in sediment concentrations since 1985. Within the same time period, two-thirds of these sites have shown improvement in nitrogen concentrations and almost all have shown improvement in phosphorous concentrations. However, in the past decade, the majority of sites surveyed showed no significant change in nitrogen or phosphorous levels, and only a handful showed improvement in sediment trends.
This doesn't mean that pollution-reduction efforts have been in vain. Long-term trends show us that pollution-reduction efforts do have an impact; findings from the last 10 years illustrate the lag time that can exist between restoration efforts and firm evidence of restoration success.
While upgrades to wastewater treatment plants, for instance, can yield relatively quick results, the effects of consistent reduced fertilizer on farms or suburban lawns may not be visible for years.
"While we see long-term improvements in many areas of the Bay watershed, there is a lag time between implementing water-quality practices and seeing the full benefit in rivers," said USGS scientist Scott Phillips. "Which is one reason why scientists see less improvement over the past 10 years."
"Long-term trends indicate that pollution-reduction efforts are improvement water-quality conditions in many areas of the watershed," Phillips said. "However, nutrients, sediment and contaminants will need to be further reduced to achieve a healthier Bay."
Learn more about Monitoring the Chesapeake Bay Watershed.
In 2011, monitoring data collected by the Bay jurisdictions and other partners showed that dissolved oxygen concentrations in the Chesapeake fell to their lowest level in the last four years with 34 percent of the waters meeting the established DO standards for the summer months. This represents a decrease of 4 percent from the 2010 figures according to the Chesapeake Bay Program (CBP) partnership and is almost half of the higher DO values recorded a decade ago.
In spite of lower levels and in the face of many weather challenges, various Bay habitats and creatures that have been the target of restoration efforts showed resilience last year. In CBP news this March, scientists from Virginia Institute of Marine Sciences (VIMS) reported that despite a decrease in Bay grasses overall, the restored, healthy grass beds at Susquehanna Flats remained intact, widgeon grass beds grew (likely due to seed germination stimulated by lower salinities) and new grass beds were found in Virginia’s James River. In terms of fisheries, preliminary data by oyster scientists from Maryland Department of Natural Resources and NOAA showed good news, too. Experts estimate last year’s oyster survival rate was at its highest since 1985, oyster biomass increased 44 percent and oyster disease was at an all time low.
“Last year’s heavy rains and even this year’s early algae blooms and fish kills reinforce the critical importance of controlling polluted runoff reaching the Bay’s waters,” said Nick DiPasquale, Director of the Chesapeake Bay Program. “The survival rates of some oyster and grass beds in 2011 shows us that our efforts are working. By actively restoring and protecting valuable resources we can build a stronger, healthier Bay ecosystem that can withstand the forces of nature. Clearly, while we can’t control the weather, we can restore the watershed’s ability to survive its more extreme events. We know what works; we just need to do more of it.”
Experts were not terribly surprised by the final information on the Bay’s 2011 “dead zones” given the extreme weather. Between the very wet spring that sent excessive nutrients downstream, a hot, dry, early summer and more heavy rains accompanying Tropical Storm Lee and Hurricane Irene, conditions in the Chesapeake were bound to be affected.
Peter Tango, CBP Monitoring Coordinator and U.S. Geological Survey scientists explains, “The Bay ecosystem functions most effectively when fresh and salt water can mix, just like oil and vinegar need to mix to form salad dressing. A large fresh water influx such as that in 2011, along with intense heat, can result in vast differences in quantities of warm fresh and cool salt water in the Bay. These variables make it more difficult for water to mix vertically in the water column.”
In addition to vertical mixing, the dissolved oxygen levels in the Bay are also affected by what happens at the edges. Tango continues: “By the fall of last year, the Upper Bay became mostly fresh water due to rain. The Lower Bay became a hot tub due to heat,” illustrates Tango. “While the initial effects of the Tropical Storm Lee’s arrival was to mix the Bay more than usual in late summer, this combination of salinity and temperature conditions resulted in minimal levels of oxygen in bottom waters that lasted well into the fall. The delay in autumn vertical mixing and the persistent summer-like water quality conditions at the northern and southern boundaries pushed on the mid-Bay waters, resulting in what we scientists call a dissolved oxygen or ‘DO squeeze.’”
All of the Bay's living creatures – from the fish and crabs that swim through its waters to the worms that bury themselves in its muddy bottom – need oxygen to survive, although the amounts needed vary by species, season and location in the Bay. A DO squeeze challenges the health of fish, crabs, and other Bay creatures since they become compacted together – predator and prey, from north to south and bottom to top – in significantly smaller sections of water where and conditions are less-than-ideal for their survival.
Virginia added approximately 840 miles of streams and 2 square miles of estuaries to its list of impaired waters in 2012, according to the state’s latest water quality report, released by the Virginia Department of Environmental Quality (DEQ). Virginia must develop more than 1,000 cleanup plans to restore the health of these and other polluted waterways.
About 260 miles of streams were removed from the list after achieving water quality standards, while another 230 stream miles were partially delisted.
In total, about 13,140 miles of streams and 2,130 square miles of estuaries are listed as “impaired,” which means they do not support aquatic life, fish and shellfish consumption, swimming, wildlife and/or public water supplies. Approximately 5,350 miles of streams and 140 square miles of estuaries are considered in good health.
Every two years, Virginia monitors about one-third of its watersheds on a rotating basis. The state completes a full monitoring cycle every six years. Since 2002, Virginia DEQ has assessed 98 percent of the state’s watersheds.
The full water quality report is available on Virginia DEQ’s website. The public is invited to comment on the report until April 27. Virginia DEQ will host a webinar summarizing the report’s results on April 9 from 10 to noon.
A new study analyzing 60 years of water quality data shows that efforts to reduce pollution from fertilizer, animal waste and other sources appear to be helping the Chesapeake Bay’s health improve.
The study, published in the Nov. 2011 issue of Estuaries and Coasts, was conducted by researchers from The Johns Hopkins University and the University of Maryland Center for Environmental Science (UMCES).
The research team found that the size of mid- to late-summer low oxygen areas, called “dead zones,” leveled off in the Bay’s deep channels during the 1980s and has been declining ever since. This is the same time that the Bay Program formed and federal and state agencies set the Bay’s first numeric pollution reduction goals.
“This study shows that our regional efforts to limit nutrient pollution may be producing results,” said Don Boesch, president of the University of Maryland Center for Environmental Science. “Continuing nutrient reduction remains critically important for achieving bay restoration goals.”
The study also found that the duration of the dead zone – how long it persists each summer – is closely linked to the amount of nutrient pollution entering the Bay each year.
For more information about the dead zone study, visit UMCES’s website.
The U.S. Environmental Protection Agency has approved new standards to control polluted stormwater runoff from roads, buildings and other developed areas in Washington, D.C.
The District’s renewed municipal separate storm sewer system (MS4) permit requires that redevelopment projects in the city install runoff-reducing practices to slow the flow of polluted stormwater to the Anacostia and Potomac rivers and the Chesapeake Bay.
The required practices include:
Roads, rooftops, parking lots and other hard surfaces channel stormwater directly into local rivers and streams, carrying pollution and eroding streambanks. The renewed permit will help the District in meeting its Bay pollution reduction goals and Watershed Implementation Plan (WIP).
Visit the EPA’s website to learn more about the new stormwater permit and standards.
Plumes of sediment were observed flowing down the Susquehanna River into the Chesapeake Bay this week after the remnants of Tropical Storm Lee brought heavy rainfall to Pennsylvania and Maryland.
The large rainfall totals caused rivers to swell, washing dirt and pollution off the land and carrying it downstream to the Bay. Record flooding and water levels were recorded at Conowingo Dam on the Susquehanna River last week.
Image courtesy NASA/GSFC/MODIS
Walking my two high-spirited Boykin Spaniels, Rosebud and Daisy, has special meaning to me. I have become the self-appointed advocate for picking up pet waste in Anne Arundel County, Maryland. Many call me the “queen of poop” (with a chuckle); it’s a title of distinction, as far as I’m concerned! But you might wonder how I earned that title and why I think it is a good thing? (My parents certainly do!)
I encourage everybody to walk with their four-legged friends. It’s good for both your health and your dog’s. Many popular routes in Anne Arundel County now have pet waste stations to encourage you to pick up your dog’s poop. Picking up pet waste is critical to achieving a healthy Chesapeake Bay. Pet waste can be carried by rainwater and groundwater to the Chesapeake Bay, where it becomes harmful pollution.
I developed an interactive web site called Annapolis and Anne Arundel County Pet Walks, which maps the locations of pet waste stations in the area. You can even visit the website from your mobile device while you’re out walking your dog to find the nearest pet waste station.
If you know of a pet waste station that isn’t included on the map, or if you’d like to learn how to set up a pet waste program in your community, please contact me at email@example.com.
Meanwhile, please take a walk with your dog today. And remember: POOP HAPPENS…Deal with it!
What do farms, manure, and a developing technology for creating fertilizer have to do with the Chesapeake Bay? Well, almost one-quarter of the Chesapeake Bay’s 64,000 square mile watershed is agricultural land. Runoff from farmland inevitably drains into the local streams, creeks and rivers that flow to the Chesapeake Bay.
When best management practices are not implemented on agricultural lands, runoff can carry animal waste and excess fertilizer into these waterways, overloading them with nutrients, bacteria and pathogens.
A developing technology called anaerobic digestion has been proposed to reduce phosphorus runoff from many farms. Pilot studies have been conducted in several locations around the world, including at least three Chesapeake Bay watershed states.
Anaerobic digesters, or biodigesters, have become an increasingly popular tool for managing manure on farms. Biodigesters are thought to have several benefits, including reducing farm animal waste runoff, producing nitrogen-rich liquid that can be used as fertilizer, and producing phosphorus-rich solids that can be processed into mulch and other products that would reduce runoff.
Biodigesters are increasing in popularity for use with dairy farms and manure handled as a liquid, slurry or semisolid. However, a Bay Program website visitor wanted to know about the effectiveness of using biodigesters on poultry farms with litter feedstock to improve water quality in the Bay and its tributaries.
One study conducted in the Bay watershed for the Propane Education Research Council tried to determine if this method could decrease the phosphorus in the liquid effluent from the digester exit point. Unfortunately, the study concluded that this was not the case. Phosphorus was only decreased by approximately 5 percent – the same rate of reduction without the anaerobic digestion process. The council concluded that significant phosphorus reduction could be possible if a separate post-digester step was added.
According to that study, the use of biodigesters would not be an effective way for farmers to help improve water quality.
John Ignosh is a scientist with the Virginia Cooperative Extension at Virginia Tech, working on agricultural byproduct utilization. “As far as digesters [used for] litter,” he said, “there have been a few pilot projects looking at this. The main challenge is that digestion is better suited for slurry type feedstocks.”
Most discussion of anaerobic digesters is in reference to digesters using a slurry type feedstock, but Ignosh said there have been pilot projects with litter feed conducted in Maryland, Virginia and West Virginia, among other locations.
An important note is that regardless of the type of feedstock used for the biodigesters, there is not a significant reduction in nutrients from the waste. Nitrogen enters the digester as ammonium and organic nitrogen, and the ammonium is not destroyed in the digester. Instead, the organic nitrogen is converted to ammonium. So the nitrogen in the effluent from the digester typically ends up being higher than when it went in. Similarly, the microorganisms used in the digester do not consume phosphorus. Although some of the phosphorus can be converted to a soluble form, the total mass of phosphorus remains constant.
Therefore, while anaerobic digesters may be useful for producing biogas to create energy and manage waste, they do not reduce the amount of nutrients in the fertilizer or other products it might result in. So fertilizer that is made from a biodigester and is used on farmland would not decrease the amount of nitrogen and phosphorus that would run off the land. These devices also tend to be prohibitively expensive for many farms and do not provide the best benefit for the investment.
For more information, visit the following websites:
The U.S. Environmental Protection Agency has proposed draft sediment limits as part of a “pollution diet” the agency is developing to restore the Chesapeake Bay and its local streams, creeks and rivers.
The watershed-wide draft limit of 6.1-6.7 billion pounds of sediment per year is divided among the six watershed states and the District of Columbia, as well as the major river basins. In 2009, an estimated 8.09 billion pounds of sediment flowed to and clouded the waters of the Bay and its tributaries.
Excess sediment suspended in the water is one of the leading causes of the Chesapeake Bay's poor health. The culprits are the tiny clay- and silt-sized fractions of sediment. Because of their small size, clay and silt particles often float throughout the water, rather than settling to the bottom, and can be carried long distances during rainstorms.
When there is too much sediment in the water, the water becomes cloudy and muddy-looking. Cloudy water does not allow sunlight to filter through to bay grasses growing at the bottom of the Bay's shallows. Just like plants on earth, bay grasses need sunlight to grow; without it, these underwater grasses die, which affects the young fish and blue crabs that depend on bay grasses for shelter.
Bay jurisdictions are expected to use the draft allocations as the basis for completing their Watershed Implementation Plans (WIPs), which detail how they will further divide the limits among different sources of pollution and achieve the required reductions. Jurisdictions must provide the first drafts of their WIPs to the EPA by September 1, and final Phase 1 WIPs are due November 29.
“While we all recognize that every jurisdiction within the watershed will have to make very difficult choices to reduce pollution, we also recognize that we must collectively accelerate our efforts if we are going to restore this national treasure as part of our legacy for future generations,” said EPA Regional Administrator Shawn Garvin.
The EPA expects the Bay jurisdictions to have all practices in place to meet their established pollution limits by 2025, with 60 percent of the effort completed by 2017. Progress will be measured using two-year milestones, or short-term goals. The EPA may apply consequences for inadequate plans or failing to meet the milestones.
The EPA will issue a draft Chesapeake Bay Total Maximum Daily Load (TMDL) – the “pollution diet” – on September 24, with a 45-day public comment period immediately following. The final Bay TMDL will be established by December 31.
The EPA proposed draft allocations for nitrogen and phosphorus in July.
For more information about the Chesapeake Bay TMDL, visit www.epa.gov/chesapeakebaytmdl.
We've received a lot of questions lately about the Gulf of Mexico oil spill and if it will affect the Chesapeake Bay. The general scientific consensus right now is that it is unlikely that oil from the Gulf will reach the Chesapeake Bay, but experts continue to monitor the situation to stay ahead of any changes in the oil's projected path.
A few Bay Program partners have posted information about the oil spill in relation to the Chesapeake Bay:
Additionally, scientists and experts from many Bay Program partners are lending their time and expertise to the response effort in the Gulf region. Some examples include:
Here's a sampling of some recent news articles and blog entries about the oil spill and the Bay:
For more information about the Gulf oil spill, visit the following websites:
We'll update this blog entry with any additional information about the Gulf oil spill and its potential effect on the Bay.
The Chesapeake Bay Program had great success in Beijing from March 28 to April 5, 2009, when we worked with the World Bank and United Nations Global Environment Facility (UN-GEF) to develop the first-ever watershed program in China for the Hai River watershed, a 123,000-square-mile area that includes the 31 million people in Beijing and Tianjin.
Several of the goals of the World Bank and UN-GEF project were to:
At a five-day conference, we worked with Chinese federal level equivalents of the EPA, Department of Agriculture and the Department of Water Resources. Representatives and experts from the province (state) and local levels were also present. What our Chinese colleagues brought to the table was energy, a passion to begin their first watershed program, and knowledge that the status quo of polluted water and air wasn’t good enough.
They also brought legacy baggage: inexperience with watershed programs, ministries and departments that have never worked together on a watershed scale, and the perspective that their ministries treat what should be public domain data as private property. If data is to be had, it has to be purchased from the agency that collected it, generating problems in a watershed program that is short on monitoring, discharge and emission data to begin with.
This sounds pretty grim, but it’s really not too different than in the 1980s when the Bay Program began, and, ya’ know, ya’ gotta start somewhere.
The conference began with two days of six interrelated presentations that told the story of the Chesapeake Bay Program’s integrated air, watershed, estuary and living resources models. Our Chinese colleagues were particularly interested in the air and watershed models, as they’re developing an assessment of the overall proportions of point and nonpoint source loads to the Bo Hai watershed. This is exact same question the Bay Program set out to answer with the first watershed model in the early 1980s.
In our discussions on the first day, it came out that there was a real interest in estimating the land export factors for the Hai watershed, so we went back to the hotel after dinner and worked pretty much though the night to put together a new presentation specifically on this topic. It’s kind of cool we can do this with the internet. Even on the other side of the world, we were able to use our web-served documentation and reports to make this new presentation happen.
The Bay Program’s open web-based approach was also a revelation to our Chinese colleagues, as was our program’s office, which holds EPA, university, U.S. Geological Survey, National Park Service, Forest Service, state agency personnel, and representatives from other organizations all working on the same watershed. This is completely different from the insular and closed approach in Chinese public agencies today.
By the end of the technology transfer conference, we heard consensus about taking an overall mass balance approach for nutrient inputs and outputs in the Hai River watershed – a key first step that needs to be taken in any study. We encouraged them to begin a spreadsheet of the mass balance right away, taking into account the numbers of animals in each county and the estimated loads from animal and village populations. The important thing was to get some momentum going on this project, as well as to get an early sense of the data gaps and problems that would need to be sorted out. There will be a thousand areas of compromise and best professional judgments that will be key to putting this first watershed assessment together.
Overall, our participation was a great success. Rarely have we felt the Bay Program have such a large impact over such a short period of time. Our Chinese colleagues saw the Bay Program as an example to follow. After 30 years of our watershed protection program, we are at a Phase 5 level of watershed modeling, while they’re able to start at a Phase 1 or Phase 2 level and build from there.
We congratulate and applaud our Chinese colleagues for beginning this watershed approach. It’s the right track and will in the long run provide the most complete and cost-effective environmental protection. A new cooperation among the different Chinese agencies leading this project has begun, which will be key to any success with their first watershed program. Our colleagues in Beijing have made good progress in this direction and have the right mix of environmental, agricultural and water resource agencies at the table, as well as a good representation from the federal, provincial and local levels.
We thank our Chinese colleagues for their kind hospitality and for making the Chesapeake Bay Program a part of their conference.
Background on the Hai watershed and Bohai Sea:
Covering a catchment area of 123,000 square miles, the Hai River is a crucial river in North China formed by the convergence of five rivers in Tianjin: the Chao River, the Yongding River, the Daqing River, the Ziya River and the Hutuo River. The Hai River flows into the Bohai Sea.
China is a country of mixed messages. I noticed on my first night in Beijing that in the sink of my hotel bathroom was a large red sign with an international red circle and slash over a picture of a drinking water glass. Clearly, an indication not to drink the water. Next to it were two drinking water glasses that were set out ready for use.
The theme of mixed messages seems to sum up the dichotomy in China between increasing prosperity on one hand, and huge environmental problems on the other. Sure, there’s a growth, but increasingly voices are being raised about the air that can’t be breathed, and the water that can’t be drunk. One hears, “Where’s the fish? They were here in my father’s day.” With the growing prosperity in China, one also hears, “This is my air clean it up!” or, “This is my river – fix it!
For us in the Chesapeake region, this sounds all too familiar. In fact, there are parallels to where we were in this region in the 1970s and 1980s, when the environment all around us seemed to be heading irretrievably downhill. It was about then that citizens here said “Enough!” and started restoring the Chesapeake Bay, just about one decade after the citizens of the entire country said “Enough!” on the first Earth Day in 1970, and we began the long process of cleaning up our air and waters. China now seems to be on the cusp of that same decision.
This, then, was the backdrop for the Chesapeake Bay Program’s visit to Beijing this April, when we spoke with Chinese scientists and managers from three different agencies about setting up China’s first watershed program. In this workshop, there were three federal-level Chinese agencies, roughly equivalent to our EPA, Department of Agriculture, and U.S. Geological Survey, as well as provincial and local government representatives. People from these different agencies were meeting together for the first time and taking about the first watershed program ever in China.
They were totally wowed with the Bay Program's work as we relayed the different tools of research, monitoring and modeling we used in the Chesapeake. At the close of a week of intense discussion and technology transfer, we left them charged up, and convinced that they're on the right track with this new watershed approach. They were going to first apply it to the Bo-Hai basin, a watershed of 123,000 square miles that contains the mega cities of Beijing, Tianjin, and the adjacent coastal bay. With what they learned in the Bo-Hai basin, they’ll expand to other watersheds in China.
This is an example of an environmental jump-start, similar to the economic leapfrogging the Chinese have mastered. We can hope that their watershed programs avoid our mistakes, and profit from our successes. For example, we shared with our Chinese colleagues our knowledge of atmospheric deposition, the highest nutrient input load to the Chesapeake watershed. Higher than fertilizer loads. Higher than manure loads. And about a third of the nitrogen load delivered to the Chesapeake.
Our Chinese hosts were incredulous and suggested that this could not be a feature of Chinese watersheds. We suggested, in the face of evidence of rapidly expanding industrialization with little or no controls of nitrogen oxide emissions, that the nitrogen deposition in China may be on the order of about 20 kilograms of nitrogen per hectare. The older, more experienced Chinese professionals were most skeptical. Point sources, manure and fertilizer loads, they knew, and they planned to track these loads in their nascent watershed program. They even had work underway to track “village loads,” a euphemism for human wastes used as fertilizer in agricultural fields, still a feature of Chinese small plot village agriculture. But atmospheric deposition loads of nitrogen? They just couldn’t believe it.
The very next day one of the bright Chinese managers found a reference for an atmospheric deposition study in China. The verdict? Serendipity and happenstance put that referenced Chinese atmospheric deposition load right at 20 kilograms per hectare, the load we has suggested just the previous day as what may be found in China. The Bay Program’s reputation was secured!
That bright young manager was one of what we’ll call the “young innovators”: up-and-coming men and women from junior management with a whole career ahead of them and ready to move up. My impression was that the young innovators were the key to China’s environmental future. These mid-level managers seemed to be the most eager to learn about the Bay Program’s long-established triad of monitoring, modeling and research that develops the plans that drive implementation of restoration efforts in the Chesapeake. We shared with them the importance of open-source, public-domain data, information, models and analysis.
Most importantly, we shared with them the idea that information wants to be free. That is, the power of information is magnified and more fully applied when it’s available to all, and we have “every brain in the game.” The status quo in China today is that Chinese agencies use information as a zero sum game. They think, “If I have the information, then I know something that you don’t, and if you want that information you’re going to have to pay for it.” This is no way to run a watershed program! Imagine what would happen to our Chesapeake partnership if USGS, NOAA, EPA, and every state agency wanted to be paid for the data that they collected as part of their publicly funded mission?
China clearly needs to innovate, throw out their old-think that “power comes from tightly held information” business model, and become more “Google-like.” China needs to ask, “What would Google do?” Google’s business model is to develop useful information and then give it away. Hence, these Google products: Google Search, Google Earth, Google Maps, Google Images, Gmail, You Tube, and Google just about everything.
This develops a huge customer base that Google uses for subtle targeted ad placement.
Public agencies, especially in China, need to think of how to best apply a form of this business model. Public agencies like ours don’t advertise, of course, but we do need to reach people with information, make it downloadable, web-browsable, relevant and useful. And so we also want to build a large customer base just the same as Google.
For China, and for us at the Bay Program, the “What Would Google Do?” questions take the form of:
There’s reason for hope in China’s new watershed program and other environmental programs. They’re learning from us and they’re anxious to begin the hard work. I was questioned by a Chinese Department of Agriculture colleague who works at the local level to encourage rural villages to install biogas digesters for human and animal manure. He asked me, “Why aren’t these beneficial biogas digesters more widely adopted in American villages?” He had little understanding of how North American large-scale agriculture works and how it’s different from the small-scale village plot farming in China, but the man’s drive and passion to implement good environmental management practices in Chinese villages was clear.
Change and environmental restoration won’t come easy in China. It’ll be one village biogas digester at a time, along with a hundred different types of best management practices. But it can come. Like with the Chesapeake Bay, the Chinese will need to gird themselves for a long, hard struggle. But given time, a lot of hard work, and a chance for the young innovators to apply their skills and passion, change will come.
Read part two of this blog series.
Welcome to this week’s installment of the BayBlog Question of the Week! Each week we'll take a question submitted through the Chesapeake Bay Program website and answer it here for all to read.
This week, Dave is trying to get a sense of “who is causing what” in relation to the Chesapeake Bay’s pollution issues. He wants to know: what are the main sources of nitrogen, phosphorous and sediment to the Bay?
It’s important to know where Chesapeake Bay pollution comes from because we can use that knowledge to do our part to reduce the amount of pollutants each of us contributes to the Bay and its local waterways.
Nitrogen occurs naturally in soil, animal waste, plant material and the atmosphere. However, most of the nitrogen delivered to the Bay comes from:
Phosphorous, like nitrogen, occurs naturally in soil, animal waste and plant material. But these natural sources account for just 3 percent of the phosphorous loads to the Chesapeake Bay. Here are the major sources of the Bay’s phosphorus pollution:
Sediments are loose particles of clay, silt and sand. When suspended in the water, sediment can block sunlight from reaching underwater bay grasses. As sediment settles to the bottom of the Bay and its rivers, it smothers bottom-dwelling animals (such as oysters). Sediment can also carry high concentrations of phosphorus and toxic chemicals.
Most of the sediment to the Bay comes from agriculture. Natural sources, stormwater runoff and erosion from streams make up the rest of the sources of sediment to the Bay and its local waterways.
While some sources of pollution may be larger than others, one source is not more important to prevent than any other. We must take any and all steps to reduce nitrogen, phosphorous and sediment loads to the Bay. Think about how your daily actions contribute pollution to the Bay and its rivers. Be sure to check out our Help the Bay tips to learn how you can do your part.
We're starting a new feature here on the BayBlog called the BayBlog Question of the Week. Each week we'll take a question submitted through the Chesapeake Bay Program website and answer it here for all to read.
This week's question comes from Elaine. She asked:
I would like to use balloons as promotional give-aways, but I am concerned for the environment. What is your position on balloons and the environment?
The Chesapeake Bay Program does not have an official position on balloons and the environment. I did some research on this topic and found that releasing balloons into the air is the issue that can have environmental consequences. When balloons are released into the air and eventually deflate, they can fall back to earth and become litter on our ground and in our waterways. In this 2004 Baltimore Sun article, a staff member with the National Aquarium in Baltimore noted that animals such as fish, gulls, dolphins and sea turtles can confuse deflated balloons with food.
If you decide to use balloons as promotional giveaways, perhaps you could include a note that encourages users to dispose of the balloons properly and not intentionally release them into the air. Because we all love balloons -- we just don't want them to become litter, or worse, food for wildlife and aquatic life in the Chesapeake Bay and other waterways.
And remember, if you're outside and you see a deflated balloon lying on the ground or in a tree, pick it up! We all need to do our part to help keep litter out of our parks, beaches and waterways.
Do you have a question about the Chesapeake Bay? Please send it to us through our web comment form. Your question might be chosen for our next BayBlog Question of the Week!
The governors of the six Chesapeake Bay states, the mayor of Washington, D.C., and the chair of the Chesapeake Bay Commission have submitted a letter to the U.S. Congress to include in the reauthorized Federal Surface Transportation Act a policy to reduce polluted stormwater runoff from federal highway construction and reconstruction projects.
Nationwide, roads and related infrastructure make up at least two-thirds of all paved, impervious surfaces, according to the letter. These areas promote runoff because they do not allow water to naturally soak into the ground. When it rains, pollutants from tailpipe emissions, fluid leaks, break linings and tire wear are picked up in runoff and carried to the nearest sewer or waterway.
The letter points to a 2002 study in Maryland that showed highways in the state accounted for 22 percent of nitrogen and 32 percent of phosphorus coming from urban areas. The study showed that highways and mobile sources annually contribute 36 million pounds of nitrogen that pollute Maryland’s land, air and water. By comparison, wastewater treatment plants contribute 17 million pounds of nitrogen per year.
Most federally funded highways were constructed without the stormwater runoff controls needed to protect the health of local streams, creeks and rivers. As a result, 66 percent of the waterways listed on the national Clean Water Act 303(d) list of impaired waters are polluted because of highway runoff.
Today, the green infrastructure techniques that relieve these impacts are well-known and, according to the letter, should be included in the reauthorized Federal Surface Transportation Act.
The letter was addressed to Reps. James L. Oberstar (D-MN) and John L. Mica (R-FL), who serve as chair and ranking member, respectively, of the House Committee on Transportation and Infrastructure.
For more information, read the full letter to Congress.