Greta Jimenez
Nonpoint source (NPS) pollution is caused by rainfall or snowmelt moving over and through the ground, picking up and carrying natural and human-made pollutants, which are then deposited into lakes, rivers, wetlands, coastal waters, and groundwater. NPS pollution is generally caused by land runoff, precipitation, atmospheric deposition, drainage, seepage, or hydrologic modification. Human-made pollutants that contribute to NPS pollution include litter, pet waste, leaves, and debris that end up in street gutters and storm drains, which directly flow into bodies of water. Plastic items, in particular, are a major component of NPS pollution, with plastic debris washing into waterways and eventually making their way into the ocean.
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What You'll Learn
- Plastic items are the most common type of litter found in waterways
- Storm drains collect litter and deliver it to the nearest waterway
- NPS pollution is caused by rainfall or snowmelt moving over the ground
- NPS pollution is the leading cause of water quality issues
- Runoff from urban areas is a major origin of NPS pollution
Plastic items are the most common type of litter found in waterways
Nonpoint source (NPS) pollution is caused by rainfall or snowmelt moving over and through the ground. As the runoff moves, it picks up and carries human-made pollutants, depositing them into lakes, rivers, wetlands, coastal waters, and groundwater.
Litter is a significant contributor to NPS pollution. Storm drains, for instance, collect litter and debris from the streets and deliver them to the nearest waterway. Plastic items are the most common type of litter found in waterways. Clean Ocean Action volunteers observed that plastic items made up 73.23% of the recovered debris. Plastic bags, plastic straws, plastic bottle caps and lids, plastic toys, and plastic cups are commonly found in waterways. Plastic waste is particularly concerning because of its persistence in the environment, widespread production, use, and disposal.
Microplastics, which are formed when the sun's UV rays break plastic down into smaller pieces, can contain or absorb toxic chemicals. These microplastics are then ingested by aquatic organisms and can make their way up the food chain, even ending up in the fish and shellfish that people consume.
Trash capture technologies, such as the Bandalong Litter Trap, have been implemented in some locations to capture litter in waterways. However, these technologies often require ongoing maintenance to remove accumulated trash and debris.
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Storm drains collect litter and deliver it to the nearest waterway
Storm drains play a crucial role in collecting litter and debris from streets and delivering it to the nearest waterway, such as a stream, river, or lake. This process contributes to nonpoint source pollution, which is a significant issue for water quality. Nonpoint source pollution, also known as "pointless pollution," arises from various diffuse sources, including runoff of litter, pet waste, fertilizers, pesticides, and sediments, as well as faulty sewage and stormwater systems.
Storm drains are designed to carry runoff water through a network of pipes, eventually emptying into nearby waterways. This runoff water can pick up and transport litter and debris, such as plastic bags, cups, candy wrappers, and cigarette butts, from the streets. The litter and debris washed into storm drains can have detrimental effects on aquatic ecosystems and public health. Animals may mistake plastic for food, leading to illness or death. Additionally, plastic can persist in the environment for hundreds of years, continuously contaminating waterways and endangering their inhabitants.
To address this issue, it is essential to prevent litter and debris from entering storm drains in the first place. This can be achieved through proper waste disposal practices, such as disposing of garbage in designated trash cans, recycling, and avoiding littering. Communities can also play a role by adopting their streets and periodically collecting any garbage that might be washed into storm drains. Additionally, businesses should provide adequate trash and cigarette litter receptacles and perform daily litter pickups to discourage littering.
Furthermore, it is crucial to properly dispose of hazardous materials and household chemicals. Motor oil, paints, chemicals, and other pollutants should never be poured into storm drains as they can contaminate waterways and harm aquatic life. Instead, communities should utilize their household hazardous waste programs or collection centers to ensure proper disposal of these substances. By taking these preventive measures, we can minimize the impact of storm drains on delivering litter and pollution to nearby waterways.
While storm drains are essential for managing runoff water, their role in collecting and transporting litter and debris contributes to nonpoint source pollution. By implementing proper waste disposal practices and raising awareness about the environmental impact of littering, we can mitigate the negative effects on our waterways and ecosystems.
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NPS pollution is caused by rainfall or snowmelt moving over the ground
Nonpoint source (NPS) pollution is a critical issue that significantly impacts water quality. Unlike pollution from industrial or sewage treatment plants, NPS pollution arises from numerous diffuse sources, making it challenging to pinpoint a single origin. One of the primary causes of NPS pollution is rainfall or snowmelt moving over and through the ground, a process often referred to as runoff.
As rainfall or snowmelt moves across the ground, it picks up and carries away a diverse range of natural and human-made pollutants. These pollutants include litter, pet waste, leaves, debris, fertilizers, pesticides, sediments, and faulty septic systems. The runoff then transports these pollutants into nearby lakes, rivers, wetlands, coastal waters, and groundwater. This contamination has detrimental effects on drinking water supplies, recreational areas, fisheries, and wildlife, posing risks to both the environment and human health.
The impact of NPS pollution is evident in the pollution of coastal waters. Storm drains, designed to collect litter and debris from streets, inadvertently deliver these pollutants directly to the nearest waterway. From there, the waterways carry the debris downstream into the ocean, where tides and wave action wash the litter back onto beaches. This cycle of pollution highlights the importance of addressing NPS pollution and implementing effective countermeasures.
To mitigate the effects of NPS pollution caused by rainfall or snowmelt, several preventative measures can be taken. These include keeping litter, pet waste, leaves, and debris out of street gutters and storm drains. Properly disposing of household chemicals, used oils, antifreeze, paints, and other hazardous materials is also crucial, ensuring they are not poured into storm sewers or drains. Additionally, individuals can play a role by participating in community clean-up initiatives and adopting more sustainable habits to reduce the amount of litter and pollutants that can be washed away by rainfall or snowmelt.
By understanding the connection between rainfall or snowmelt and NPS pollution, we can develop strategies to minimize the impact on our water systems and the environment as a whole. It is essential to address this issue through a combination of public education, improved waste management practices, and the implementation of erosion control measures to protect our water quality and natural habitats.
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NPS pollution is the leading cause of water quality issues
Nonpoint source (NPS) pollution is the leading cause of water quality issues. Unlike pollution from industrial and sewage treatment plants, which are examples of point-source pollution, NPS pollution comes from many diffuse sources.
NPS pollution is generally the result of land runoff, precipitation, atmospheric deposition, drainage, seepage, or hydrologic modification. As rainfall or snowmelt moves over and through the ground, it picks up and carries away natural and human-made pollutants, depositing them into lakes, rivers, wetlands, coastal waters, and groundwater. These human-made pollutants include litter, pet waste, leaves, debris, and chemicals from lawn and garden care. These pollutants can also include hazardous household chemicals such as used oil, antifreeze, and paints, which should be disposed of properly and not poured down storm sewers or drains.
NPS pollution is the nation's largest water quality problem, according to the US EPA. It is the leading remaining cause of water quality issues, impacting drinking water supplies, recreation, fisheries, and wildlife. One example of NPS pollution is the runoff of pollutants into the Tijuana River in California, which threatens and degrades the valley's ecological, cultural, recreational, and economic resources.
Volunteer efforts to clean up waterways and beaches have been effective in reducing NPS pollution. For instance, during the 2022 Clean Ocean Action Beach Sweeps, over 8,000 volunteers collected 376,969 items, including 52,512 plastic bottle caps and lids. Additionally, the implementation of the Single-Use Waste Reduction Act in May 2022 has led to a decrease in plastic shopping bags, straws, and foam takeout containers.
To further address NPS pollution, it is important for individuals to take action to prevent stormwater runoff pollution and for communities to establish programs for collecting household hazardous wastes.
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Runoff from urban areas is a major origin of NPS pollution
Runoff from urban areas is a significant contributor to NPS pollution, which is the leading cause of water quality issues. Urbanization increases the volume and velocity of stormwater runoff, introducing various pollutants into nearby water bodies.
In urban and suburban areas, buildings, pavement, and compacted landscapes prevent rain and snowmelt from soaking into the ground, leading to increased stormwater runoff. This runoff picks up and carries pollutants such as litter, pet waste, leaves, debris, and chemicals from streets and storm drains directly into lakes, streams, rivers, and wetlands.
The impact of urban runoff extends beyond the pollution of water sources. The pollutants carried by the runoff can have detrimental effects on fish and wildlife populations, native vegetation, drinking water quality, and recreational areas.
To mitigate the problem of urban runoff, it is essential to implement low-impact development practices and proper waste disposal methods. This includes keeping litter, pet waste, leaves, debris, and other pollutants out of street gutters and storm drains, as well as responsible management of household chemicals, used oil, antifreeze, paints, and other hazardous materials.
Additionally, urban planning and landscaping techniques can play a crucial role in reducing the volume and velocity of stormwater runoff, thereby minimizing the amount of pollutants that enter water bodies. By adopting environmentally sound practices, communities can help protect water quality and preserve the health of aquatic ecosystems.
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Frequently asked questions
Nonpoint source (NPS) pollution is caused by rainfall or snowmelt moving over and through the ground, picking up and carrying away natural and human-made pollutants, and depositing them into lakes, rivers, wetlands, coastal waters, and groundwater.
Discarded trash and litter can be picked up by runoff water, which then carries it into storm drains and waterways, contributing to nonpoint source pollution.
Examples of nonpoint source pollution include the Tijuana River in California, which has been degraded by large amounts of trash and debris, and the Montrose Hazardous Releases in California, where millions of pounds of pollutants were discharged into the ocean.
Nonpoint source pollution is the leading cause of water quality problems and has harmful effects on drinking water supplies, recreation, fisheries, and wildlife. It also affects coastal ecosystems and public health.
To prevent littering from causing nonpoint source pollution, it is important to keep litter, pet waste, leaves, and debris out of street gutters and storm drains. Public education and participation in cleanup efforts are also crucial in reducing the impact of littering on nonpoint source pollution.
