Kiera Jefferson
River pollution in the United States has been an ongoing issue for years, with millions of miles of rivers being treated as open sewers and garbage cans. While the Clean Water Act has helped improve river conditions, climate change, agricultural runoff, and industrial waste continue to pose significant threats. The Ohio River, for instance, is considered one of the most polluted rivers in the US, with industrial pollution affecting the drinking water of millions. Other polluted rivers include the Calcasieu, Mississippi, Savannah, Tennessee, Harpeth, Holston, Cuyahoga, Willamette, New River, Rock, Buffalo, Delaware, Flint, Passaic, and Naugatuck. These rivers face various pollutants, from industrial waste to agricultural runoff, threatening aquatic ecosystems and human health.
| Characteristics | Values |
|---|---|
| Number of polluted rivers in the US | The EPA estimates that about 28% (or 80,000 miles) of rivers, lakes, and reservoirs are impaired due to pollution. |
| Rivers with the highest pollution levels | Calcasieu, Ohio, Mississippi, Savannah, Tennessee, Harpeth, Holston, Cuyahoga, Willamette, New River, Rock, Buffalo, Delaware, Potomac, Anacostia, Passaic, Flint, and Naugatuck. |
| Causes of river pollution | Agricultural runoff, industrial waste, mining operations, urban development, and climate change. |
| Health risks | Waterborne diseases, cancer, and other health issues for those reliant on the rivers for drinking water. |
| Efforts to reduce pollution | Clean Water Act, Clean Rivers Project, restoration projects, and individual lifestyle changes. |
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What You'll Learn
Causes of river pollution in the US
River pollution in the US has been a significant issue for decades, with the nation's waterways being treated like open sewers and garbage cans for over a century. The Clean Water Act (CWA) of 1972 was a bipartisan effort to address this crisis, aiming to make rivers swimmable, fishable, and drinkable once again. While the CWA has had a positive impact on water quality, it has not addressed all aspects of pollution, and river pollution remains a pressing issue.
One of the primary causes of river pollution in the US is agricultural activities. Agriculture is the leading cause of water degradation worldwide, and in the US, it is the top source of contamination in rivers and streams. Fertilizers, pesticides, and animal waste from farms wash into waterways during rainfall, leading to nutrient pollution. This excess nitrogen and phosphorus in the water can cause toxic algal blooms, which are harmful to both people and wildlife. The agricultural sector is also the biggest consumer of freshwater resources, using about 70% of the earth's surface water supplies, further straining water sources.
Urban areas also contribute significantly to river pollution. Increased land development and urbanization have led to more impervious surfaces, such as parking lots, roads, and buildings, which generate increased surface runoff during rainfall. This runoff carries pollutants such as gasoline, oil, heavy metals, fertilizers, and other chemicals into nearby rivers and streams. Additionally, industrial activities, including manufacturing and paper products production, generate large volumes of wastewater, which can contain toxic chemicals and contribute to water pollution in rivers.
Climate change and rising temperatures also stress aquatic ecosystems and contribute to water pollution. While the Clean Water Act has helped improve water quality, adapting to the changing climate and addressing nonpoint sources of pollution, such as agricultural runoff, remain ongoing challenges in the effort to protect and restore the nation's rivers.
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The Clean Water Act
The CWA establishes the basic structure for regulating discharges of pollutants into the waters of the United States and sets quality standards for surface waters. Under the CWA, the Environmental Protection Agency (EPA) has implemented pollution control programs, such as setting wastewater standards for industries. The EPA has also developed national water quality criteria recommendations for pollutants in surface waters.
One of the key provisions of the CWA is that it made it unlawful to discharge any pollutant from a point source into navigable waters without a permit. The EPA's National Pollutant Discharge Elimination System (NPDES) permit program controls these discharges. Industrial, municipal, and other facilities must obtain permits if their discharges go directly into surface waters.
The CWA has had a significant impact on improving the quality of waterways in the United States. Millions of miles of rivers that were once treated like open sewers and garbage cans, steeped in oil, paint, fertilizer, feces, and other refuse, have become dramatically cleaner. However, there are still ongoing challenges, such as pollution from sources not covered by the CWA, including urban and agricultural runoff, as well as the impacts of climate change on aquatic ecosystems.
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The Potomac river
The river has suffered from various forms of pollution, including sediment, nutrients, agricultural runoff, urban stormwater, and plastics. Sediment and nutrients, such as nitrogen and phosphorus, are top sources of pollution. While long-term trends show a decline in nutrient and sediment levels, rapid deforestation and climate change are emerging threats that could hinder progress. The climate crisis is contributing to more extreme storms and longer droughts, which are increasing runoff levels.
Agricultural runoff is a significant source of pollution, carrying pesticides and plastics into the river. Industrial pollution, wastewater effluence, and polluted urban runoff are also common sources. The Potomac Conservancy has identified three lesser-known pollutants: polychlorinated biphenyls (PCBs), which are linked to birth defects and cancer; endocrine disruptors (EDCs), which are not removed by treatment plants; and bacteria-ridden algal blooms, which are fostered by excess nutrients and can threaten recreation spots and drinking water sources.
Despite these challenges, the Potomac River is showing signs of improvement. The Clean Rivers Project aims to eliminate 96% of Washington, D.C.'s sewage discharges into the river by 2030. Conservation initiatives are also helping to improve water quality and protect streamside forests. The river is now home to thriving wildlife, including bald eagles and fish, and people are visiting its shorelines for outdoor activities. While swimming and consuming fish from the river are still prohibited in Washington, DC, studies are being conducted to assess whether the swimming ban can be lifted in the next few years. The Potomac Conservancy describes the river as "on the mend, but not in the clear."
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The Cuyahoga river
The river and its tributaries drain 813 square miles (2,110 km2) of land in portions of six counties. It is a relatively recent geologic formation, shaped by the advance and retreat of ice sheets during the last ice age. The final glacial retreat, which occurred 10,000–12,000 years ago, altered the drainage pattern near Akron.
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The most polluted rivers in the US
The Clean Water Act (CWA), enacted in the 1960s, made it illegal to discharge pollutants into waterways without a permit. While this has resulted in significantly cleaner waterways, many rivers in the US are still polluted. The Environmental Protection Agency (EPA) estimates that about 28% (80,000 miles) of rivers, lakes, and reservoirs are impaired due to pollution.
The Ohio River is considered the most polluted river in the US, battling relentless industrial pollution and contamination. It is a significant contributor to the country's river pollution problem. The Calcasieu River in Louisiana is also one of the most polluted rivers, bearing the heavy burden of industrial waste, chemical runoff, and oil and gas byproducts. The once-pristine waterway is now a repository for the remnants of chemical, plastic, and rubber production, posing grave health risks to those who depend on it for drinking water.
The Mississippi River, which flows through ten states, is another heavily polluted river, facing issues with industrial and agricultural pollution. The Willamette River in Oregon is subject to a similar double threat, with heavy metals and pesticides from industrial sites and farms infiltrating its waters and endangering the health of the river and its ecosystems.
Other polluted rivers in the US include the Cuyahoga, which has historically been known as the "burning river" due to volatile chemicals and debris that periodically caught fire; the Susquehanna, which is ranked in the top 15 of America's Most Endangered Rivers due to poor sewage treatment; the Potomac, which has long been known as the "nation's river" but faces issues with trash and plastic pollution linked to stormwater from urban areas; the Passaic, which has been described as having "toxic mud"; and the Flint River, which has been mentioned as one of the most polluted rivers in America.
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Frequently asked questions
The EPA estimates that about 28% (or 80,000 miles) of US rivers, lakes, and reservoirs are impaired due to pollution.
Some of the most polluted rivers in the US include the Ohio River, Calcasieu River, Mississippi River, Savannah River, Tennessee River, and Cuyahoga River.
River pollution in the US is caused by a variety of factors, including agricultural runoff, industrial waste, sewage and wastewater discharge, mining operations, and urbanization.
