Brian Barton
The Allegheny River in Western Pennsylvania has a long history of industrial pollution. While the river's health has improved since the region's industrial era, it continues to face threats from various sources. A recent study by the Pittsburgh Water Collaboratory at the University of Pittsburgh found evidence of acid mine runoff, sewage overflow, and contamination from rare toxic metals such as cadmium. The river also faces issues with motor oil and gas runoff from nearby roadways, as well as sewage overflow during rain events. While the river is in a healthier state than it has been in over a century, supporting a diverse population of fish and bird species, there are still concerns about the impact of pollution on the river's water quality and the surrounding ecosystem.
| Characteristics | Values |
|---|---|
| Industrial pollution | The Allegheny River has a history of industrial pollution, with factories and mills lining its banks. |
| Thermal pollution | During summer, thermal pollution from steel mills made the river unsustainable for life. |
| Sanitary sewage overflows | Billions of gallons of raw, untreated sewage are dumped into the river annually due to combined sewage systems. |
| Toxic metals | The river is contaminated with rare toxic metals like cadmium, associated with coke production, a key ingredient in steelmaking. |
| Acid mine runoff | Acid mine drainage (AMD) is a significant issue, impacting water quality and the environment. |
| Nutrient pollution | High concentrations of nutrients, including phosphorus, are found in the river and its tributaries. |
| Bromide levels | High bromide levels, linked to oil and gas drilling, persist in the river, potentially threatening public health. |
| Ultra-salty compound | Research shows high levels of an ultra-salty compound linked to hydrofracking in the river's watershed. |
| Current status | The river is in a healthier state than in the past, supporting a growing population of fish species and top predators like bald eagles. |
| Improvement efforts | The Allegheny County Sanitary Authority plans to invest $2 billion in a Clean Water Plan to reduce sewage overflows by 2036. |
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What You'll Learn
Sewage overflows and industrial waste
The Allegheny River, like many other waterways in Pennsylvania, has been affected by industrial waste and sewage overflows. The river was once lined with factories and mills, and during the summer months, thermal pollution from the steel mills made life unsustainable in the rivers. While the river is now in a much healthier state than it was over 100 years ago, it still faces threats from industrial waste and sewage overflows.
Sewage overflows
Sewage overflows are a significant issue for the Allegheny River. Combined sewer overflows (CSOs) occur when stormwater and untreated, diluted sewage carried in a single pipe overload the sewer system and flow into rivers and streams. ALCOSAN, the Allegheny County Sanitary Authority, has implemented the Sewer Overflow Advisory Key (SOAK) and CSO Flag Alert Program to warn the public about possible river contamination from CSOs. These programs advise recreational users to limit contact with river water during activities such as boating, fishing, and water skiing. ALCOSAN also plans to invest $2 billion in a Clean Water Plan to eliminate sanitary sewage overflows and reduce CSOs by 2036.
Industrial waste
Industrial waste has been a historical issue for the Allegheny River due to Pennsylvania's industrial heritage. In 2019, an industrial site was found to be leaking toxic waste into the river, including arsenic, chromium, lead, manganese, copper, zinc, mercury, and other toxic compounds. The pH level of some leakage was as high as 12.69, which could cause burns. Environmentalists and attorneys have criticized the lack of urgency in addressing this issue, as the leakage has been known since the 1970s.
The Allegheny River also faces potential pollution from the Shell ethylene cracker plant, which is permitted to be a significant polluter in the region. While the plant's direct impact on the water is yet to be seen, it underscores the ongoing challenges of industrial waste in the area.
Community efforts
Community groups like Three Rivers Waterkeeper play a vital role in advocating for and protecting the water quality of the Allegheny River. They organize educational events, such as kayaking sessions, to teach community members how to spot and report river pollution. These efforts are crucial in addressing the issues of sewage overflows and industrial waste, improving the health of the river, and ensuring the safety of the surrounding communities.
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Toxic metals and acid mine runoff
The Allegheny River is part of a river system that has improved since the region's industrial era but still faces pollution threats. The river was once lined with factories and mills, and during the summer months, thermal pollution from the steel mills nearly made life unsustainable in the rivers.
A recent study by the Pittsburgh Water Collaboratory at the University of Pittsburgh found that the impacts of acid mine runoff and sewage overflow continue to adversely impact the streams that feed into the Allegheny River. The study identified rare toxic metals, such as cadmium, associated with the production of coke, a key ingredient in steelmaking. While the levels of cadmium found in the study did not exceed the Environmental Protection Agency's limit for drinking water, it can build up to higher concentrations in the flesh of fish eaten from these streams.
Acid mine drainage (AMD) is a significant source of pollution, with highly acidic groundwater carrying toxic heavy metals into the river. The average pH level of freshwater is 7, which is considered neutral, neither acidic nor basic, and fish can survive in the 6-8 pH range. However, AMD can have a pH as low as 2, making it 100,000 times more acidic than neutral water. This high acidity is caused by the chemical reaction between surface water and shallow subsurface water with rocks containing sulfur-bearing minerals, resulting in sulfuric acid.
The legacy of coal mining in Pennsylvania, which dates back to the 1700s, is still visible today. In Kittanning Run, AMD is laden with toxic metals, including iron, aluminum, and manganese. The rusty orange color of the stream bed is caused by iron dropping out of the water and staining the streambard. The Department of Environmental Protection's latest report indicates that over 7,356 miles of waterways are impaired by AMD, impacting an estimated 1,305 stream miles in Pennsylvania's portion of the Chesapeake Bay watershed.
To address these issues, the Allegheny County Sanitary Authority (ALCOSAN) plans to invest $2 billion in a Clean Water Plan to eliminate sanitary sewage overflows and reduce combined sewage overflows by 2036. Additionally, they aim to remove billions of gallons of sewage runoff from the area's sanitary system by expanding its plant and building large underground storage tunnels.
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Water quality and human health
The Allegheny River is one of the primary sources of drinking water for Pittsburgh and its neighbouring communities. The river is also used for recreational activities such as kayaking. While the river is in a much healthier state than it was during the region's industrial era, it still faces pollution issues that impact water quality and, consequently, human health.
One of the major concerns regarding the Allegheny River's water quality is the presence of pollutants such as manganese (Mn) and iron (Fe). Although these substances are not directly harmful to human health, they can cause undesirable effects, such as unpleasant taste or odour in the drinking water.
Another issue highlighted by recent studies is the impact of acid mine runoff and sewage overflows into the river. This has led to the contamination of rare toxic metals, such as cadmium, which is associated with the production of coke, a key ingredient in steelmaking. While the levels of cadmium found in the studies did not exceed the Environmental Protection Agency's limit for drinking water, it can build up to higher concentrations in the flesh of fish consumed by humans.
In addition to the industrial activities, human interactions have also contributed to the complex narrative of water quality in the region. For example, motor oil and gas from nearby roadways can stream into the river during rainfall, especially when there is insufficient infrastructure to manage the runoff.
To address these issues, local organizations and authorities have taken initiatives to improve water quality. The Allegheny County Sanitary Authority (ALCOSAN), for instance, plans to invest $2 billion in a Clean Water Plan to eliminate sanitary sewage overflows and reduce combined sewage overflows by 2036. Additionally, they aim to remove billions of gallons of sewage runoff from the sanitary system by expanding their plant and building underground storage tunnels.
Furthermore, advocacy groups like Three Rivers Waterkeeper aim to protect and improve the water quality of Pittsburgh's rivers. They collaborate with organizations like Pitt and the University of Pittsburgh to conduct studies and gather data on water quality, filling the gaps in understanding the city's water systems. These studies help identify pollutants and their sources, providing valuable insights to inform remediation efforts and improve the health of the rivers, which directly impacts the well-being of the communities that rely on them.
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Environmental impact and ecological balance
The Allegheny River, along with the Monongahela and Ohio Rivers, forms what is known as the "Three Rivers" of Pittsburgh. These rivers are more than just bodies of water; they are lifelines, providing drinking water for Pittsburgh and its neighbouring communities.
The Allegheny River has a history of industrial pollution. During the industrial era, the river was lined with factories and mills, causing thermal pollution that made life unsustainable for many species. While the river is now in a much healthier state, with over 70 species of fish and top predators like bald eagles, it still faces pollution threats.
One of the major issues is sewage overflow. The region has a combined sewage and water runoff system, which means that when it rains, even a small amount, sewage-rain water mixture flows into the river. This results in billions of gallons of raw untreated sewage entering the river each year, posing a significant risk to human health and the environment. The Allegheny County Sanitary Authority (ALCOSAN) has recognized this problem and plans to invest $2 billion in a Clean Water Plan to eliminate sanitary sewage overflows and reduce combined sewage overflows by 2036.
In addition to sewage, the river faces pollution from industrial sources. A 2012 report noted high levels of an ultra-salty compound, likely linked to oil and gas drilling, in the Allegheny River's Pittsburgh-area watershed. Bromide levels, which can be associated with coal-fired power plants and oil and gas drilling, have also been a concern. While there has been progress in wastewater recycling, river bromide levels have not shown a clear decline.
Acid mine drainage (AMD) is another critical issue impacting the river. AMD results in acidic waters and heavy metal contamination, threatening drinking water sources and the ecological balance. High concentrations of nutrients, including phosphorus, have also been found in the river, which can be tied to contemporary facilities and the legacy of pollution from industrial byproducts.
The presence of rare toxic metals, such as cadmium, has also been detected in the river system. While the levels did not exceed drinking water limits, cadmium can accumulate in the flesh of fish, posing risks to human health and the food chain.
The environmental impact of the Allegheny River's pollution is far-reaching. It affects not only the river itself but also the streams that feed into it and the communities that rely on it for water. The intricate chemistry of the river and its tributaries plays a pivotal role in shaping water quality and the health of the surrounding ecosystem.
Despite the challenges, there are efforts to improve and protect the water quality. Advocacy groups like Three Rivers Waterkeeper organize educational events to teach community members about spotting and reporting river pollution. Their collaboration with organizations like Pitt on studies and sampling collection helps shed light on the various pollutants affecting the river. These studies provide valuable insights and roadmaps for mitigating threats and ensuring clean water access for Pittsburgh's residents.
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Pollution prevention and cleanup efforts
The Allegheny River, like many other rivers in the Pittsburgh area, has been affected by industrial pollution. While the river is in a better state than it was during the region's industrial era, it still faces pollution threats.
The Allegheny County Sanitary Authority (ALCOSAN) has developed a Clean Water Plan with a $2 billion investment to eliminate sanitary sewage overflows and reduce combined sewage overflows by 2036. The plan includes expanding the sewage treatment plant and constructing large underground storage tunnels to remove billions of gallons of sewage runoff from the sanitary system. This will help protect the river from contamination and improve the overall water quality in the region.
The advocacy group Three Rivers Waterkeeper, founded in 2009, plays a crucial role in monitoring and protecting the water quality of Pittsburgh's rivers, including the Allegheny. They organize educational events, such as kayaking sessions, to train community members to spot and report river pollution. By involving the community, they raise awareness and encourage active participation in preserving the health of the river.
In addition to these efforts, a recent study by the Pittsburgh Water Collaboratory at the University of Pittsburgh examined various pollutants in the tributaries that feed into the Allegheny River. The study found that acid mine runoff, sewage overflows, and rare toxic metals like cadmium continue to negatively impact the water quality. By understanding the specific contaminants, the relevant authorities can develop targeted strategies to address these issues and improve the health of the river.
While the Shell ethylene cracker plant in Potter Township is permitted to be a significant polluter, its potential impact on the river is yet to be determined. Nonetheless, organizations like Three Rivers Waterkeeper remain vigilant in monitoring the situation and advocating for the protection of the river system. These collective efforts demonstrate a commitment to preventing pollution, restoring ecological balance, and ensuring the long-term health of the Allegheny River.
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Frequently asked questions
Yes, the Allegheny River is polluted. Billions of gallons of raw untreated sewage flow into the river every year.
The main source of pollution in the Allegheny River is the combined sewage and water runoff system. When it rains, motor oil and gas from nearby roadways can also stream into the river.
Yes, there are concerns about high levels of bromide, an ultra-salty compound that could be linked to oil and gas drilling, as well as acid mine drainage, and nutrient pollution.
The Allegheny County Sanitary Authority plans to invest $2 billion in a Clean Water Plan to eliminate sanitary sewage overflows and reduce combined sewage overflows by 2036. The Three Rivers Waterkeeper advocacy group also aims to improve and protect the water quality.
While some people do swim in the Allegheny River, it is not recommended due to the presence of human feces and other pollutants. The strong currents and potential for drowning are also concerns. Kayaking is a popular alternative to swimming.
