Meghan Hodges
The San Francisco Bay and the Chesapeake Bay are two bodies of water that are currently facing threats from pollution and human activity. The San Francisco Bay is under constant stress from industrial pollution, sewage spills, trash, oil tankers, and hazardous chemicals. The Chesapeake Bay is facing similar issues, with excessive amounts of nitrogen and phosphorus coming from fertilizers, wastewater, air pollution, and runoff from farms, cities, and suburbs. These pollutants are causing a reduction in dissolved oxygen levels, creating dead zones where aquatic life cannot survive. In addition, agriculture is the largest source of nutrient and sediment pollution entering the Chesapeake Bay, and invasive species are also causing harm to the bay and its watershed. Climate change is also a significant factor, with rising sea levels, warming water temperatures, and extreme weather already being observed in both bay regions.
| Characteristics | Values |
|---|---|
| Type of Pollution | Nutrient and sediment pollution |
| Sources of Pollution | Fertilizers, wastewater, septic tank discharges, air pollution, runoff from farms, cities, and suburbs, industrial pollution, raw sewage spills, trash, oil tankers, hazardous chemicals, mining, dredging, habitat destruction |
| Pollutants | Nitrogen, Phosphorous, Pesticides, Pharmaceuticals, Metals, Mercury, Bacteria |
| Effects | Reduced levels of oxygen, Algae blooms, Loss of aquatic life, Poor water quality, Invasive species, Climate change, Habitat loss, Endangered species loss |
| Location | Chesapeake Bay, San Francisco Bay Delta Watershed |
| Action Plan | EPA set limits on nitrogen, phosphorous, and sediment pollution for Chesapeake Bay with state plans to achieve the limits by 2025, EPA Climate Change Handbook for Regional Water Planning |
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What You'll Learn
Nitrogen and phosphorus pollution
Nitrogen and phosphorus are essential nutrients for the growth of living organisms in the Chesapeake Bay. However, excessive amounts of these nutrients can degrade the Bay's water quality and threaten its health. The primary sources of nitrogen and phosphorus pollution in the Bay include agricultural runoff, wastewater treatment plants, and air pollution.
Agricultural runoff is the largest source of nitrogen and phosphorus pollution, contributing approximately 60% and 45% of these nutrients, respectively. Farmlands in the watershed use fertilizers, which, when used in excess, can wash off the land and into the Bay's freshwater tributaries. Additionally, animal feedlots and manure storage facilities can also contribute to nutrient runoff.
Wastewater treatment plants are another significant source of nitrogen and phosphorus pollution. In 2005, new permit processes were implemented to limit the amount of nutrients these plants could discharge into rivers and streams. However, they remain a substantial contributor to the Bay's nutrient pollution.
Air pollution emitted by vehicles, industries, and gas-powered lawn equipment contributes about one-third of the total nitrogen load entering the Chesapeake Bay. As the air sheds covering the Bay stretch across multiple states and provinces, including Canada, Ohio, and South Carolina, addressing this issue requires coordinated efforts across regions.
The consequences of excessive nitrogen and phosphorus in the Bay are severe. These nutrients fuel the growth of algae blooms, which block sunlight from reaching underwater grasses and deplete the water of dissolved oxygen. This creates "'dead zones" where aquatic life, including fish and shellfish, cannot survive. The EPA has listed the Chesapeake Bay as "impaired" due to these reduced oxygen levels and the resulting loss of aquatic life.
To address nitrogen and phosphorus pollution, several strategies have been proposed and implemented. These include upgrading stormwater systems and sewage treatment plants, improving septic system operations, and reducing fertilizer applications on lawns. The Chesapeake Bay Program has set a goal of achieving applicable water quality standards by 2025 through its Watershed Implementation Plans. As of 2023, practices put in place have achieved an estimated 57% of the required nitrogen reductions and 67% of phosphorus reduction.
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Industrial pollution
The Baykeeper organization has been instrumental in advocating for a healthier Bay. Through their Bay-Safe Industry Campaign, they have secured legally binding agreements with 51 industrial facilities, requiring them to implement controls to prevent toxic pollution from entering the Bay. Several other facilities are also making progress, with reductions in their runoff pollution levels ranging from 50 to 90%.
Despite these efforts, industrial pollution remains a constant stressor for the Bay and its watershed. Government agencies have been criticized for not fully enforcing laws and policies designed to protect the Bay. Weak regulations and lobbying by polluters contribute to the ongoing problem.
In addition to toxic runoff, industrial activities such as mining, dredging, and habitat destruction also harm the Bay. The mismanagement of critical wetlands, the Bay's bottom floor, and the freshwater sources that flow into it further exacerbate the issue. These activities leave the Bay in a weakened and unstable condition, underscoring the urgent need for stronger regulations and enforcement to protect this fragile ecosystem.
To address industrial pollution, it is crucial to implement stricter regulations and hold facilities accountable for their pollution reduction commitments. Community engagement and advocacy play a vital role in urging government agencies to prioritize the health of the Bay and its surrounding environments. By working together, it is possible to mitigate the impacts of industrial pollution and restore the Bay's ecological integrity.
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Habitat loss
The Chesapeake Bay watershed provides food, water, protection, and nesting/nursery areas to more than 3,600 species of plants and animals. The loss of these habitats is one of the biggest threats to fish and wildlife in the region. There are three main ways habitat loss can occur: destruction, fragmentation, and degradation.
Destruction of habitats occurs when wetlands are filled in, trees are cut down, rivers are dredged, and land is developed. For example, the development of forests and farmland robs the watershed of its natural ability to filter pollutants, allowing them to reach streams, rivers, and the bay. This results in the loss of air and water filters, wildlife habitats, and other significant functions that forests provide. Development also causes more sediment pollution to run into the bay during construction, endangering important underwater habitats.
Habitat fragmentation occurs when a species' territory is divided by roads, development, dams, and other physical features that make it difficult for the fragmented areas to support species or for migratory wildlife to feed, rest, or reproduce. More than 75,000 large dams and 2.5 million barriers block fish from reaching 600,000 miles of rivers and streams in the United States, affecting fish migration.
Habitat degradation is caused by factors such as rising sea levels, climate change, and nutrient pollution. Sea level rise has already led to the loss of coastal marshes and islands in the Chesapeake Bay, and the Bay's low-lying topography makes it especially vulnerable to future loss. Climate change can also alter habitat conditions and affect the migratory patterns of wildlife. Nutrient pollution, primarily from agricultural runoff, reduces water quality and lowers oxygen levels in the water, creating "'dead zones" where aquatic life cannot survive. Excess nitrogen and phosphorus can also fuel algae blooms, which block sunlight from reaching underwater grasses and further deplete oxygen levels, suffocating marine life.
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Climate change
The Chesapeake Bay watershed, in particular, is vulnerable to the effects of climate change. The bay has historically been impacted by natural forces such as erosion, tides, hurricanes, and storms. However, human activities since the 17th century, including pollution, construction, and poultry farming, have exacerbated these challenges. As sea levels rise, archaeological sites are at risk of being submerged and covered in sediment, requiring the use of specialized equipment for their identification and preservation.
Nutrient pollution, primarily from agricultural and industrial sources, contributes to eutrophication in the bay. Excess nutrients, especially nitrogen and phosphorus, stimulate algal blooms, leading to oxygen depletion and environmental degradation. This process, known as eutrophication, results in the formation of "'dead zones,' where bottom-dwelling organisms are deprived of oxygen. The bay's dead zones have severe ecological consequences, such as the annual loss of 75,000 tons of clams and worms, disrupting the food chain for species like the blue crab.
To address nutrient pollution and eutrophication, various policies and regulations have been implemented. The Chesapeake Bay watershed has been the focus of interstate efforts to prevent eutrophication, emphasizing the reduction of nutrient inputs. While progress has been made, challenges remain in fully addressing all aspects of pollution and adapting to the ongoing impacts of climate change.
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Invasive species
The introduction of invasive species to estuaries is often accidental, occurring through transportation or human introduction. For example, the oyster population in the Chesapeake Bay was nearly wiped out due to overharvesting, which put many other organisms at risk as oysters act as water filters within the bay. The presence of invasive species can alter the entire ecosystem and have devastating effects.
Development and human activities, such as the conversion of forests, farms, and other landscapes into subdivisions, shopping centers, and parking lots, contribute to the introduction of invasive species. These activities reduce the natural ability of the watershed to filter pollutants, allowing them to reach streams, rivers, and the bay. As a result, the bay's dissolved oxygen levels decrease, creating "dead zones" where aquatic life cannot survive.
Agricultural practices, including the use of fertilizers and pesticides, can also introduce invasive species into the bay and its watershed. While agriculture provides food and fiber, it is also a significant source of nutrient and sediment pollution entering the bay. Excess nutrients, such as nitrogen and phosphorus, from agricultural runoff, can fuel the growth of algae blooms, creating conditions harmful to underwater life and threatening native species.
To address the issue of invasive species, it is crucial to reduce nutrient pollution in the bay watershed. This can be achieved through the implementation of practices such as installing green roofs, rain gardens, or rain barrels to capture and absorb rainfall, using porous surfaces instead of asphalt or concrete, and properly managing fertilizer usage. By mitigating the impact of invasive species and promoting sustainable practices, we can help protect the bay and its watershed for future generations.
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Frequently asked questions
The type of pollution threatening the Bay depends on which bay is being discussed. The San Francisco Bay and the Chesapeake Bay are both under threat from various forms of pollution.
San Francisco Bay
- Industrial pollution
- Raw sewage spills
- Trash
- Oil tankers
- Hazardous chemicals
- Mining
- Dredging
- Habitat destruction
Chesapeake Bay
- Nitrogen and phosphorous from fertilizers, wastewater, septic tank discharges, air pollution, and runoff from farms, cities, and suburbs.
- Sediment from erosion and construction sites.
- Invasive species
- Climate change
