Meghan Hodges
Water pollution is a pressing issue that affects our rivers, lakes, and seas, with sources ranging from industrial waste to agricultural runoff. It is caused by the release of harmful substances, including chemicals, waste, and plastic, which render water unsafe for human use and disrupt aquatic ecosystems. Point sources, such as discharges from factories or sewage treatment plants, directly contribute to water pollution. In contrast, dispersed sources, like agricultural runoff or air pollution from power plants, are more challenging to control. Additionally, natural processes like eutrophication can be accelerated by human activities, leading to premature aging and the death of water bodies. Water pollution has severe consequences, impacting human health, wildlife, and the economy.
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What You'll Learn
Industrial waste and agricultural runoff
Water pollution is the release of substances into bodies of water that make it unsafe for human use and disrupt aquatic ecosystems. It has many sources, including industrial waste and agricultural runoff.
Industrial Waste
Industrial waste is waste generated by manufacturing or industrial processes. It includes cafeteria garbage, dirt and gravel, masonry and concrete, scrap metals, trash, oil, solvents, chemicals, weed grass and trees, wood and scrap lumber, and similar wastes. Industrial solid waste can be solid, liquid, or gas held in containers, and it is divided into hazardous and non-hazardous waste. Hazardous waste may result from manufacturing or other industrial processes, such as shale gas extraction, which produces large volumes of wastewater with high concentrations of dissolved solids, radionuclides, metals, and other pollutants.
Industrial wastewater usually contains specific and readily identifiable chemical compounds, and it is often toxic. The food products industry and the processing of industrial chemicals are large contributors to water pollution. Most major industries have treatment facilities for industrial effluents, but small-scale industries often cannot afford the necessary investments in pollution control equipment. As a result, contaminated water destroys aquatic life and reduces its reproductive ability, diminishes the aesthetic quality of lakes and rivers, and renders the water unsuitable for drinking, recreation, agriculture, and industry.
Agricultural Runoff
Agricultural runoff is the leading cause of water quality impacts to rivers and streams, the third leading source for lakes, and the second-largest source of impairments to wetlands. Every time it rains, fertilizers, pesticides, and animal waste from farms and livestock operations wash nutrients and pathogens, such as bacteria and viruses, into waterways. Increased levels of nitrogen and phosphorus from fertilizer and manure can stimulate algal blooms, which can lead to hypoxic (low oxygen) conditions that are harmful to aquatic life. Algae can also affect recreational uses of local streams, downstream reservoirs, and estuaries, and algae overgrowth can block sunlight, disrupting the ecosystem below the water surface.
Excessive sedimentation from erosion can overwhelm aquatic ecosystems, smother breeding areas, and degrade coastal and marine ecosystems, including coral reefs. Bacteria and nutrients from livestock and poultry manure can cause beach and shellfish bed closures and affect drinking water supplies. Pesticide runoff to streams can pose risks to aquatic life, fish-eating wildlife, and drinking water supplies. According to the USDA's Agricultural Research Service, livestock and poultry in the United States produce nearly 1.4 billion tons of manure annually, and this waste is often spread on the land untreated, leading to runoff into water sources. Farmers can reduce nutrient runoff by following fertilizer best practices and adopting regenerative agriculture strategies, such as planting cover crops and streamside buffer crops.
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Sewage and wastewater treatment
There are two main types of sewage treatment systems: decentralized and centralized. Decentralized systems treat sewage close to where it is created, such as on-site sewage facilities or septic tanks. Centralized systems, on the other hand, collect and transport sewage through a network of pipes and pump stations to a municipal treatment plant. This network is known as sewerage, and it conveys the sewage to a treatment plant. Cities with combined sewer systems carry both sewage and stormwater runoff to the sewage treatment plant.
The sewage treatment process typically involves primary and secondary treatment stages, with advanced treatments incorporating a tertiary stage. Primary treatment removes about 60% of suspended solids from wastewater and includes aerating the wastewater to restore oxygen. Secondary treatment removes more than 90% of suspended solids. Advanced treatments may include additional polishing processes and nutrient removal.
Despite the presence of sewage treatment facilities, water pollution from sewage and wastewater remains a significant issue. Aging and overwhelmed sewage treatment systems can release untreated wastewater, posing threats to public health and the environment. Additionally, combined sewer overflows (CSOs) in older cities can result in the release of untreated human and industrial waste, toxic materials, and debris into water bodies.
Furthermore, wastewater treatment is interconnected with other water uses, and the treatment process aims to reduce pollutants to a level that nature can handle. However, with the vast amounts of wastewater and sewage produced daily, nature's ability to cope with water wastes and pollution is strained. As a result, it is crucial to properly treat wastewater before releasing it back into the environment to minimize water pollution.
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Plastic pollution from fishing boats, tankers and cargo shipping
Water pollution is a pressing issue that affects one in every three people on the planet, according to the United Nations. It is caused by the release of harmful substances into bodies of water, rendering it unsafe for human use and disrupting aquatic ecosystems. One significant source of water pollution is plastic pollution from fishing boats, tankers, and cargo shipping.
Fishing boats contribute to plastic pollution in several ways. Firstly, they discard commercial fishing gear, such as nets and lines, which can entangle and harm marine life. This abandoned gear makes up an estimated 10% of all ocean debris. Additionally, litter generated on fishing boats, such as food packaging and other plastic items, may be improperly disposed of during routine operations, ending up in the ocean.
Tankers, which are responsible for transporting and storing oil and its derivatives, pose a significant risk of oil spills. While the number of accidental spills has decreased in recent decades, oil pollution from shipping remains an environmental concern. Intentional oil spills, which account for 45% of marine oil pollution, and accidents, which contribute 8%, both contribute to the problem. Moreover, tankers' engine and machinery spaces often leak oil, which can mix with water in the bilge and, even after filtration, have detrimental effects on marine life.
Cargo shipping is another major contributor to plastic pollution in the oceans. Containers are frequently lost due to extreme weather, operational errors, or inconsistent securing standards, introducing large quantities of plastic debris into the marine environment. Additionally, some vessels illegally discharge plastic waste directly into the sea, further exacerbating the problem. The annual increase in shipping volume overwhelms efficiency gains, resulting in a significant environmental impact.
To address plastic pollution from fishing boats, tankers, and cargo shipping, a multi-level governance framework is necessary. This includes the enforcement of international regulations, improvements in waste management practices, and the development of biodegradable materials to reduce environmental harm. By holding polluters accountable and enhancing waste reception facilities at ports, we can work towards mitigating the plastic pollution caused by these sources.
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Oil spills and leaks from pipelines
In the United States, there is a troubling history of oil pipeline spills, with nearly 300 significant incidents occurring each year on average since 1986. These incidents have resulted in more than 500 deaths, more than 2,300 injuries, and nearly $7 billion in damage. The cleanup of pipeline spills is often only partially successful, leaving tens of thousands of barrels of oil in the water.
For example, in December 2022, a rupture in the Keystone Pipeline in Kansas discharged more than 500,000 gallons of oil into a creek, killing more than 100 animals. This was not an isolated incident, as the Keystone Pipeline has been the source of at least 22 spills since 2010. In June 2024, a pipeline spill in Smackover, Arkansas, released more than 100,000 gallons of crude oil into the surrounding areas, including creeks that flow into the Ouachita River.
Oil spills from pipelines can have severe environmental and health consequences. Oil can smother and drown wildlife, cause hypothermia, and lead to acute toxicity if ingested. It can also contaminate drinking water sources, as seen in the 2015 spill in the Yellowstone River that affected 6,000 people and caused lesions and gill problems in fish.
To mitigate the risk of oil pipeline spills, stricter safety standards and regular inspections are necessary. Additionally, transitioning to clean energy sources can help eliminate the dependence on oil, reducing the risk of spills.
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Animal waste and fertiliser runoff
Furthermore, animal waste from concentrated animal feeding operations (CAFOs) has been linked to water contamination. The large volume of waste generated by CAFOs, coupled with the presence of contaminants such as antibiotics and veterinary drugs, poses a significant risk to water quality. Inadequate waste management practices in CAFOs have been documented to impact surface water sources and wildlife in many agricultural areas.
Fertiliser runoff, primarily from agricultural activities, is another major source of water pollution. When excess fertilisers are applied to fields, the subsequent rain or snowmelt can wash away the fertilisers, leading to nutrient pollution in nearby waterways. This excess of nutrients, specifically nitrogen and phosphorus, can cause eutrophication of water bodies, leading to hypoxic "dead zones" and a decline in aquatic life.
Farmers can play a crucial role in mitigating fertiliser runoff by adopting nutrient management techniques. This includes applying fertilisers in the proper amounts, at the right time of year, and with suitable methods. Additionally, implementing conservation tillage practices can help reduce erosion and runoff, further minimising the risk of nutrients reaching waterways.
Both animal waste and fertiliser runoff have significant impacts on water quality and the environment. By understanding the sources and implementing proper management practices, we can help reduce their detrimental effects on our precious water resources.
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Frequently asked questions
Water pollution can come from a variety of sources, including factories, sewage treatment plants, oil spills, runoff from farms and homes, and littering.
Water pollution can occur from factories and sewage treatment plants through direct inputs of toxic chemicals and pollutants into water bodies or through air pollution that falls back into land and water bodies.
Water pollution can have negative impacts on both human and wildlife health. For humans, polluted drinking water can cause diseases such as diarrhoea, cholera, dysentery, typhoid, and poliomyelitis. It can also lead to increased treatment costs, resulting in higher drinking water prices. For wildlife, water pollution can cause health problems, poisonings, and long-term ecosystem damage, such as disrupting aquatic ecosystems and creating low-oxygen areas where aquatic life cannot thrive.
Individuals can play a role in reducing water pollution by properly disposing of chemical cleaners, oils, and non-biodegradable items, reducing plastic consumption, and maintaining their vehicles to prevent leaks and spills. Additionally, individuals can advocate for policy changes and support scientific advances to address larger issues contributing to water pollution.
