Kiera Jefferson
The Mississippi River is one of the most polluted rivers in the world. Water quality in the Mississippi River has improved in recent years, but it still faces a range of pollution issues. The river takes in water from a vast area, and its pollution affects communities downstream, ultimately impacting aquatic life, habitats, and people who rely on the river. The Mississippi River's pollution is caused by a variety of factors, including agricultural runoff, urban and residential pollutants, sedimentation, and toxic chemicals. These issues have led to eutrophication, hypoxia, and the formation of a 'dead zone' in the Gulf of Mexico. While efforts to reduce pollution and enhance the river's ecology are ongoing, the Mississippi River's vast watershed and the accumulation of pollutants pose significant challenges.
| Characteristics | Values |
|---|---|
| Human Activities | Pollution from cities, towns, and agricultural practices |
| Water Quality Issues | Toxic chemicals, high levels of nutrients, sedimentation, microplastics, and unregulated chemicals |
| Impact | Negative effects on aquatic life, habitats, and humans |
| Policy Changes | Implementation of the Clean Water Act and other initiatives to reduce pollution and enhance ecology |
| Water Quality Improvement | Reduction in Total Suspended Solids (TSS), phosphorus loading, and certain types of pollutants |
| Challenges | Persistent and emerging pollutants, nitrate pollution, chloride accumulation, and plastic waste |
| Public Health | 40% of lakes in America are too polluted for fishing, aquatic life, or swimming |
| Economic Impact | High cost of dredging due to sedimentation |
| Environmental Impact | Dead zones in the Gulf of Mexico due to excess nutrients and stratification |
| Community Efforts | Monitoring and restoration initiatives by organizations like MWMO |
| Prevention and Control | Economic incentives, design standards, volunteerism, proper fertilizer and pesticide use, and recycling initiatives |
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What You'll Learn
Industrial Revolution waste
The Mississippi River has long been a vital source of drinking water and a principal route for inland waterborne commerce in the United States. However, the river has suffered from pollution and ecological degradation due to various human activities, including industrial waste dumping.
During the Industrial Revolution in the late 1800s, the lumbering industry in Minnesota began dumping sawdust and other waste into the Mississippi River. Research by the Army Corps of Engineers in 1881 revealed that the river's sandbars were filled with sawdust instead of sand, indicating the presence of industrial waste in the water. This was just the beginning of the river's pollution problems.
As industrialization progressed, chemical plants and oil refineries located along the river, especially in the southern regions, started discharging toxic waste into the water. The river became contaminated with a range of harmful substances, including furan, trichlorobenzene, DDT, trichloroethane (TCA), and polychlorinated biphenyls (PCBs). These toxic chemicals had severe ecological impacts, leading to the disappearance of various fish and wildlife species in the upper river and the deterioration of wetland ecosystems.
In the 1930s, the situation worsened, with an estimated 144 million gallons of sewage and garbage being dumped into the Mississippi River daily. Cities and towns contributed to the pollution by discharging untreated wastewater, and industrial activities further introduced pollutants into the river's banks, causing a decline in water quality.
While legislative efforts and environmental initiatives have been undertaken to restore the river's health, the Mississippi River continues to face challenges from industrial waste and other sources of pollution. Nonpoint source pollution, including agricultural runoff and urban waste, remains a significant issue, impacting the river's ecosystems and the communities that rely on it.
Today, there is a renewed focus on addressing the problem of plastic pollution in the Mississippi River. The Mississippi River Cities & Towns Initiative (MRCTI) has brought together mayors, global stakeholders, and citizens to collect data on plastic waste within the watershed. These collective efforts aim to improve waste management systems and infrastructure to reduce the environmental impact of plastic pollution on the river and its surrounding ecosystems.
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Agricultural runoff
Nitrogen and phosphorus are the most common agricultural pollutants found in the public waters of the Mississippi River Basin. These chemicals are essential for plant growth and are applied to farmland as fertilizers to increase crop yields. However, when excess fertilizer is applied, or it is applied at the wrong time, some of it ends up in the water. This runoff contributes to the growth of harmful algae, fish kills, animal deaths, and the classification of some drinking water sources as unsafe for the public.
The runoff of nitrogen and phosphorus from fertilizers and manure applied to farmland also contributes to the development of hypoxic zones, or "dead zones," in the receiving waters. These areas have very low levels of dissolved oxygen, which can lead to the death of marine life. The Dead Zone in the Gulf of Mexico, an area devoid of life that forms each summer, is a result of excess nutrients from the Mississippi River and seasonal stratification of Gulf waters.
To address agricultural runoff, the Environmental Protection Agency (EPA) has asked states along the Mississippi River to develop Nutrient Reduction Strategies. These strategies aim to reduce nitrogen and phosphorus loading in surface waters and include initiatives such as limiting pollution in stormwater runoff from farm fields, improving enforcement of Concentrated Animal Feeding Operations (CAFO) regulations, and adopting conservation practices such as minimizing soil tillage and restricting cattle access to waterways.
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![Saline-water contamination in Quaternary deposits and the Poplar River, East Poplar Oil Field, northeastern Montana / by Joanna N. Thamke and Steven D. Craigg ; prepared in cooperation [Leather Bound]](https://m.media-amazon.com/images/I/61IX47b4r9L._AC_UY218_.jpg)
Sedimentation
One of the main issues caused by sedimentation is the filling in of important habitats for fish and wildlife, including spawning grounds. The accumulation of silt and sand can smother these habitats and impede the movement of fish and other aquatic organisms. This can lead to a decline in biodiversity and the disruption of ecological processes, such as reproduction and migration.
Additionally, sedimentation can transport and bury pollutants within the riverbed. Silt particles can carry and trap pollutants such as PCBs, heavy metals, and phosphorus. While this "'burying'" effect can help to reduce the concentration of pollutants in the water column, it does not eliminate them. These contaminants can still pose risks to aquatic life and can accumulate in the food chain, potentially impacting both wildlife and human health.
The Upper Mississippi River is particularly vulnerable to sedimentation due to its vast drainage area and the alteration of its natural sediment movement by the lock and dam system. The construction of levees and dams has altered the river's natural flood patterns, exacerbating the impacts of sedimentation and creating areas of hypoxia, or "dead zones," particularly at the river's mouth in the Gulf of Mexico.
While sedimentation is a natural process, human activities have intensified its rate and impacts on the Mississippi River. Agricultural practices, urban development, and industrial activities have increased the amount of sediment and pollutants entering the river, exacerbating the problem of sedimentation and its ecological consequences.
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Stormwater drain systems
The Mississippi River and its tributaries carry excessively high levels of nutrients and pollutants, leading to the formation of a biological dead zone at the river mouth in the Gulf of Mexico. This area, known as hypoxia, has very low oxygen levels due to the excess nutrients and seasonal stratification of waters. Agricultural runoff, including fertilizers and pesticides, is a significant contributor to this issue.
Storm sewers, or municipal storm sewer systems (MS4s), are a direct source of sediments and contaminants in the Mississippi River. These systems are designed to direct stormwater runoff into local waterways, but they are not equipped to handle non-stormwater wastes. Illicit discharges, such as motor vehicle fluids, household hazardous waste, paint, grass clippings, litter, cigarettes, and animal waste, are not meant to be processed by MS4s. However, when these substances are washed into storm sewers, they contaminate the water and negatively impact aquatic ecosystems and human health.
To address this issue, universities like the University of Minnesota have implemented Storm Water Pollution Prevention Programs (SWPPP) to reduce pollutants from stormwater runoff. The university holds an MS4 permit, which helps reduce the amount of sediment and other pollutants entering state waters from stormwater systems. BMPs, or best management practices, are also employed to filter out pollutants and prevent pollution by controlling it at its source. Additionally, individuals can play a role in preventing stormwater pollution by properly disposing of hazardous waste, reducing soil erosion, and directing roof runoff away from sanitary or storm sewer systems.
Overall, stormwater drain systems have had a significant impact on the pollution of the Mississippi River. While efforts are being made to mitigate the problem, it is crucial to continue implementing measures that reduce the amount of contaminants entering the river through stormwater runoff.
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Climate change
The effects of climate change on the river's ecology are becoming increasingly apparent. Warmer winters have been associated with higher levels of chlorophyll, or algae, in the river. There has been an increasing incidence of harmful algal blooms in portions of the Upper Mississippi River system, such as the Illinois River. Climate change is exacerbating the problem of nutrient pollution, as higher temperatures and increased rainfall contribute to excess nutrients in the water.
The Mississippi River is the second-longest river in the United States and serves as a critical drainage basin for over 40% of the country. It is a vital source of drinking water and plays a crucial role in inland commerce. However, engineering projects aimed at improving navigation and preventing flooding have led to severe ecological degradation. The construction of levees and dams has altered natural flood patterns, disrupted ecosystems, and contributed to the creation of hypoxic zones, particularly at the river's mouth.
The Upper Mississippi River Restoration Program is working in partnership with the Army Corps of Engineers and the five upper Mississippi River states to collect long-term data on water quality, vegetation, and fisheries. This data is essential for understanding the river's condition and targeting restoration efforts effectively. The program has successfully restored about 100,000 acres of habitat and enhanced habitat for migratory birds, fish species, and native mussels.
While legislative efforts and environmental initiatives have been implemented to address the pollution and ecological degradation of the Mississippi River, challenges such as nonpoint source pollution and habitat loss persist. The balance of nutrients and water quality characteristics continues to be impacted by human activities along the river and in its watershed. Climate change is a pressing concern that requires collaborative efforts to protect and restore the health of the Mississippi River ecosystem.
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Frequently asked questions
The Mississippi River is one of the most polluted rivers in the world. While water quality has improved in the past few decades, certain pollutants persist, and new threats are emerging.
The Mississippi River's pollution comes from both point sources and non-point sources. Point sources refer to specific locations like sewage pipes, while non-point sources are more challenging to regulate and include agricultural runoff, urban pollutants, and residential areas.
Agricultural practices, particularly the use of fertilizers and pesticides, are a significant concern. Fertilizer runoff from adjacent farmland leads to nutrient loading and eutrophication, resulting in the creation of "'dead zones' in the Gulf of Mexico.
Urban areas contribute pollutants such as oil, grease, sediment, and microplastics. These pollutants accumulate as they travel downstream, affecting aquatic life and communities along the river. Policy changes and initiatives by organizations like MWMO have helped reduce urban pollution.
The pollution in the Mississippi River has negative consequences for aquatic life, habitats, and humans who rely on the river. It leads to the formation of "dead zones" with very low oxygen levels, impacting marine life and the overall ecological balance.
