Meghan Hodges
Stormwater runoff is the primary source of water pollution in the USA. Stormwater is the runoff water after it rains or snows, and it flows over streets, parking lots, and roofs, collecting excess nutrients and pollutants before entering storm drains or water bodies. This runoff water picks up litter, sand, bacteria, chemicals, fertilizers, oil, and gas from cars, and carries these pollutants into streams, ponds, and wetlands. Construction sites are a particular concern, as dirt and debris from these sites can wash off and contaminate nearby water bodies.
| Characteristics | Values |
|---|---|
| Pollutants | Litter, sand, bacteria, chemicals, fertilizers, oil, gas, nitrogen, phosphorus, pesticides, pet waste, hazardous waste, motor oil, yard waste, trash, debris |
| Sources | Lawns, streets, rooftops, parking lots, industrial facilities, construction sites, gutters, rain gutters, houses, buildings |
| Impact | Contaminates drinking water supplies, hinders recreation activities, harms aquatic and other wildlife habitats |
| Prevention | Proper waste management, recycling, disposal, erosion control, green infrastructure, low impact development, rain gardens, pervious pavement, rain barrels, green roofs, organic fertilizers, biodegradable soaps |
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What You'll Learn
Construction site runoff
Stormwater is rainwater or snowmelt that flows over the ground and into storm drains, carrying with it a variety of pollutants. Construction site runoff is a significant contributor to stormwater pollution, and it can have severe environmental and public health impacts.
Construction activities often involve the use of various materials and substances that can become pollutants when washed into nearby water bodies through stormwater runoff. These pollutants include sediment, heavy metals, hazardous chemicals, and waste materials.
Sediment from construction sites can increase turbidity in water bodies, blocking sunlight and harming aquatic life. Heavy metals such as lead, copper, and zinc can accumulate in sediments and pose lethal risks to aquatic organisms. Hazardous chemicals, such as paints, grease, oils, and other toxic substances, can contaminate water and harm any animal or organism that consumes it.
In addition to these, construction sites may also be a source of bacterial pollution, with microorganisms like Cryptosporidium, found in animal waste, posing a significant risk to rivers and lakes.
The impact of construction site runoff pollution can be mitigated through proper waste management, erosion control, and pollution prevention strategies. Site managers play a crucial role in identifying potential sources of pollution and implementing control measures outlined in Stormwater Pollution Prevention Plans (SWPPP). By following best management practices (BMPs), such as preserving existing vegetation and phased construction, construction workers and site managers can minimize erosion and reduce stormwater runoff.
Overall, addressing construction site runoff pollution is essential to protect local ecosystems and ensure clean water sources for communities and wildlife.
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Fertilizers and pesticides
Stormwater is rainwater or snowmelt that instead of soaking into the ground, flows over streets, parking lots, and roofs and enters storm drains or water bodies. Stormwater runoff often contains pollutants such as fertilizers and pesticides.
Fertilizers are chemicals used to promote the growth of plants and crops. Fertilizers are a common source of pollution in storm drains and nearby water bodies. When a garden or yard is over-watered, fertilizers can be washed away more easily. Fertilizer residues can be found in lawn clippings, and if these clippings are dumped carelessly, they can be carried away by stormwater and cause soil and water contamination. Fertilizers contain nutrients such as nitrogen and phosphorus, which can cause nutrient pollution in water bodies. This can lead to undesirable algal blooms and harm fish and other wildlife. Fertilizers can also increase the levels of bacteria and parasites in the water, making it unsafe for human recreation and drinking.
Pesticides are chemicals used to kill or control pests such as insects, weeds, and fungi. Pesticides can be transported by stormwater into storm drains and nearby water bodies, where they can contaminate the water and make it unsafe for fishing and drinking. Pesticides can also harm aquatic life and destroy their habitats. When pesticides are applied to lawns or crops, they can be washed away by rain or snowmelt and enter water bodies. Pesticides can also impact groundwater by leaching into septic systems and landfills, rendering it unsafe for human consumption.
To minimize the impact of fertilizers and pesticides on stormwater runoff, property owners can take proactive steps such as reducing the use of fertilizers and pesticides, disposing of lawn clippings properly, and using native vegetation that requires less fertilizer.
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Motor oil and fuel
Stormwater runoff is often contaminated with motor oil and fuel from vehicles. This can happen when automobiles are repaired or washed, or when there is an oil spill or leak. Motor oil and fuel can also be picked up by stormwater as it flows over streets and parking lots.
Motor oil is a significant pollutant, with a single oil change capable of polluting up to one million gallons of freshwater. When motor oil and fuel are washed into storm drains, they can contaminate waterways, including oceans, rivers, and streams. This can harm drinking water supplies, hinder recreational activities such as swimming and fishing, and damage aquatic habitats and wildlife.
To prevent motor oil and fuel from entering storm drains, it is important to properly contain and dispose of these substances. When repairing a vehicle, use a drip pan to catch any oil that may spill. Recycle used motor oil at a certified collection center, and clean up any oil spills promptly.
When washing a car, it is recommended to use a certified car wash whenever possible. If washing a car at home, do so on a permeable surface with biodegradable soap to allow the runoff to be absorbed into the ground. Never let the water run off your property and into a storm drain.
In addition to proper containment and disposal, preventing motor oil and fuel from entering storm drains also involves regular maintenance of vehicles. Fixing leaky automobiles and addressing oil leaks can reduce the risk of these substances contaminating stormwater runoff.
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Litter and debris
Stormwater is the runoff water after it rains or snows. Stormwater pollution is the number one source of water pollution in the USA. Storm inlets, where water from rain or snowstorms flows into, can get clogged with debris, which can restrict outflow and cause flooding during heavy rainfall.
Construction sites are another source of litter and debris in storm drains. Stormwater runoff from construction sites can easily transport sediment, pollutants, and debris to nearby storm drains, rivers, or lakes. This is because construction activities remove the protective vegetative layer that holds soils together, and erosion can occur at much higher rates. Dirt from construction sites can cause problems for streams and creeks when it washes off.
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Hazardous waste
Stormwater is the runoff water after it rains or snows. It can pick up and carry pollutants from streets, parking lots, and roofs into storm drains, which then discharge directly into nearby water bodies. This process can contaminate drinking water supplies, hinder recreation, and harm aquatic wildlife habitats.
Industrial Facilities
Industrial facilities can generate various hazardous wastes, such as chemicals, heavy metals, and toxic substances. If not properly contained and disposed of, these wastes can be washed away during storms and end up in storm drains. To prevent this, industrial facilities should have adequate waste management systems in place, including proper containment, treatment, and disposal methods.
Construction Sites
Construction activities can generate hazardous waste, such as pesticides, solvents, and construction debris. When it rains, these wastes can be washed away and enter storm drains. To mitigate this, construction sites should implement erosion control measures, stabilize the site, and properly manage and contain wastes. Leaving the site in better condition than it was found is an important principle to follow.
Residential Areas
Residential areas can contribute to hazardous waste in storm drains through improper disposal of household chemicals, paints, and other toxic substances. Residents should be educated on proper waste disposal methods and encouraged to use waste containers with lids. Additionally, washing cars on streets or driveways should be avoided, as it can result in soapy water and contaminants entering storm drains.
Agricultural Sources
Farms and agricultural operations can generate hazardous waste, such as pesticides, fertilizers, and animal waste. When it rains, these contaminants can be washed into storm drains, impacting nearby water bodies. Implementing buffer zones, using cover crops, and adopting integrated pest management practices can help reduce the impact on storm drains and improve water quality.
By taking proactive measures and adopting best management practices (BMPs), we can minimize the amount of hazardous waste entering storm drains and protect our water resources and ecosystems. Proper waste management, erosion control, and community education are key components in mitigating the negative impacts of hazardous waste on our environment.
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Frequently asked questions
Stormwater is the runoff water after it rains or snows. It flows over streets, parking lots, and roofs, collecting excess nutrients and pollutants before entering into a storm drain or water body.
Stormwater runoff often contains sediment, fertilizer, pesticides, oil, gasoline, pet waste, or hazardous waste.
Polluted stormwater is the number one source of water pollution in the USA. It contaminates drinking water supplies, hinders recreational activities, and harms aquatic and other wildlife habitats.
Individuals can play a role in preventing stormwater pollution by properly disposing of waste, reducing the use of pesticides and chemicals, and cleaning up after their pets.
Catch basins act as the first line of defence by capturing large sediments and street litter from urban runoff before it enters the storm drainage pipes. The design and maintenance of catch basins impact their effectiveness in removing sediment and other pollutants.
