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 firstname.lastname@example.org.
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.