Brian Barton
Nonpoint source pollution refers to diffuse contamination of water or air that does not come from a single source. NPS pollution is caused by everyday activities and includes pollutants such as fertilizers, pesticides, oil, toxic chemicals, and more. It is challenging to control due to the difficulty in tracing pollution back to its sources. However, it is essential to address NPS pollution as it significantly impacts water quality and the environment. To combat NPS pollution, various approaches can be implemented, including public education, government regulations, erosion control, proper waste disposal, and the use of buffer strips and retention ponds.
| Characteristics | Values |
|---|---|
| Definition | Nonpoint source (NPS) pollution refers to diffuse contamination (or pollution) of water or air that does not originate from a single discrete source. |
| Sources | Everyday sources such as fertilizers, pet waste, nutrients (phosphorus and nitrogen), pathogens, sediment, metals, pesticides, herbicides, and oil. |
| Challenges | NPS pollution is challenging to pinpoint and control due to its diverse sources and the difficulty in tracing pollution back to a single source. |
| Control Measures | Buffer strips, retention ponds, proper waste disposal, septic system maintenance, erosion control, low-phosphorus household products, public education, and collaboration between various entities. |
| Government Action | The US EPA has a dedicated grant program, Section 319, to help states implement NPS pollution control projects. Local governments can enforce septic system maintenance and establish programs for collecting household hazardous waste. |
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What You'll Learn
Reduce the use of fertilizers, herbicides, and pesticides
Nonpoint source (NPS) pollution is an indirect form of pollution that adversely affects water quality. NPS pollution is challenging to control because it is difficult to pinpoint. Stormwater runoff, which may contain fertilizers and pesticides, is an example of NPS pollution. To reduce NPS pollution, it is essential to minimize the use of fertilizers, herbicides, and pesticides.
Fertilizers, such as those containing nitrogen, can negatively impact the environment if used excessively. A study by Hasken & Poehling (1995) found that wheat fields treated with conventional levels of nitrogen fertilizer had significantly higher aphid populations than those with reduced or no fertilizer use. To control pests without the use of fertilizers, consider non-chemical methods such as selecting the right products and following directions carefully when applying pesticides.
Herbicides can also have detrimental effects on the environment. Glyphosate, a commonly used herbicide, has been shown to be successfully degraded using bacterial consortium, reducing its concentration in wastewater. Another study found that plant extracts from Nerium and olive effectively combat weeds through the allelopathy effect, providing an eco-friendly alternative to chemical herbicides.
Pesticides are another contributor to NPS pollution. Minimizing their use can help reduce environmental impacts. A study by Huusela-Veistola (1996) found that reducing management intensity, specifically fertilizer and pesticide inputs, led to an increase in arthropod numbers and species richness. Additionally, ladybirds, a natural predator of aphids, were found to be more prevalent in plots without insecticide treatment, highlighting the importance of reducing pesticide reliance.
Overall, reducing the use of fertilizers, herbicides, and pesticides is crucial in controlling NPS pollution. This can be achieved through alternative methods such as eco-friendly plant extracts, bacterial degradation, and non-chemical pest control strategies. By minimizing the use of these chemicals, we can help protect water quality and promote a healthier environment for both humans and other living organisms.
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Properly dispose of used oils, antifreeze, paints, and other household chemicals
Properly disposing of used oils, antifreeze, paints, and other household chemicals is crucial to preventing nonpoint source pollution, which can have detrimental effects on the environment. Here are some detailed and instructive guidelines on how to properly dispose of these substances:
Used Oils
Used oils, such as engine lubrication oil, hydraulic fluids, and gear oils from vehicles or equipment like lawnmowers, can contaminate the environment if not recycled or disposed of correctly. To properly manage used oils, contact local automobile maintenance facilities, waste collectors, or government waste officials to find designated drop-off locations for recycling. Used oil filters should also be properly drained and recycled at these collection centers. Recycling used motor oil is highly beneficial, as it can be re-refined into new lubricating oil, processed into fuel oils, and used as raw materials for the petroleum industry.
Antifreeze
Antifreeze is considered a hazardous waste and should be disposed of responsibly. Most cities have hazardous waste disposal drop-off locations, so it is important to contact local authorities or waste management services to inquire about proper disposal procedures and locations.
Paints
Improper disposal of paint can have toxic effects on the environment. Latex paint can be disposed of by mixing it with equal parts cat litter in a lined box or trash can. Allow the mixture to thicken and dry before disposing of it in the garbage. For oil-based paints, check with local disposal regulations, as they are often considered hazardous waste and require specific disposal methods or drop-off centers. Alternatively, consider donating usable paint to local community centers, charities, or places of worship.
Household Chemicals
Household chemicals, such as pesticides, herbicides, paint cleaners, gasoline, motor oil, battery acid, and other toxic substances, require special attention when it comes to disposal. Many municipalities have hazardous waste collection programs or designated drop-off locations for these types of chemicals. Contact your local waste management authority or refer to community guidelines to ensure proper disposal methods and locations.
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Control soil erosion by planting ground cover
Soil erosion can be prevented by planting ground cover and stabilising erosion-prone areas. Ground cover plants spread and strike down roots to retain the soil. They also protect the soil from sun damage, which can cause soil erosion by drying out the upper layers.
There are many types of plants that can be used to prevent soil erosion, including those with deep roots or suckering habits that anchor the soil. This is especially important on steep slopes or hillsides where erosion is most problematic. Fast-growing plants such as suckering shrubs, prairie natives with taproots, and vining perennial ground covers are good options for stabilising slopes in erosion-prone areas.
Some specific examples of ground cover plants that can help prevent soil erosion include creeping junipers, which stay short (generally no more than 1 foot) and are cold-hardy (suited to zone 3 to 9). Deutzia is another example of a shrub that will spread and strike down roots to retain soil.
Sweet box is a versatile plant that can be grown in pots or in the ground and is suitable for US hardiness zone 6 and above. It sends out roots that stabilise soils with its extensive root system. Lamb's ear (Stachys byzantina) is another option for a sunny, sloping yard, as it can tolerate full sun and dry summers, growing in US hardiness zones 4 to 9.
In addition to ground cover plants, other methods for stabilising soil and preventing erosion include using mulch and erosion control blankets to hold the soil and reduce runoff. Creating terraces with small stone retaining walls can also help to stabilise steep slopes.
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Implement buffer strips of grass between roads and bodies of water
Buffer strips are areas of land maintained in permanent vegetation that help to control air, soil, and water quality, along with other environmental problems. They are designed to intercept runoff using permanent vegetation. They can be composed of grass, trees, and shrubs, with grassed waterways helping to carry surface water at a non-erosive velocity to an area with a stable outlet.
When considering how to implement buffer strips of grass between roads and bodies of water, it is important to understand the role of these strips in reducing nonpoint source (NPS) pollution. NPS pollution is an indirect source of pollution, including stormwater runoff containing fertilizers, pesticides, oil residue, and soil lost from construction sites. This type of pollution is challenging to control as it is difficult to pinpoint.
By implementing buffer strips of grass, the vegetation acts as a filter, trapping sediment and enhancing the filtration of nutrients and pollutants. The root systems of the grass hold soil particles together, reducing wind and water erosion and stabilizing stream banks, which helps to prevent substantial erosion and landslides. This is particularly effective when combined with other erosion-control practices.
To implement buffer strips of grass between roads and bodies of water, the following steps can be taken:
- Identify areas where buffer strips can be established, considering the distance from roads and water bodies.
- Select appropriate grass species that are native to the region and have effective root systems for erosion control.
- Prepare the selected areas by removing any existing vegetation and loosening the soil to promote grass growth.
- Seed the areas with the chosen grass species, ensuring uniform distribution for effective coverage.
- Provide adequate water and maintenance during the initial growth period to establish a healthy grass cover.
- Once established, periodically maintain the grass strips by mowing and reseeding as needed to ensure their effectiveness.
By following these steps, the implementation of buffer strips of grass between roads and bodies of water can help to control NPS pollution, improve water quality, and stabilize the surrounding environment.
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Improve septic system maintenance
Maintaining a healthy septic system is critical to protecting groundwater, lakes, streams, and human health. Septic systems must be regularly maintained and evaluated to ensure they are treating sewage effectively. Here are some detailed tips to improve septic system maintenance:
Regular Inspections and Pumping: Septic tanks should be inspected and pumped regularly, generally every three to five years. During inspections, septic service providers will check for leaks and examine sludge layers. It is important to keep maintenance records and note the sludge and scum levels to determine when pumping is necessary.
Efficient Water Use: Conserving water improves the operation of a septic system and reduces the risk of malfunctions. Homeowners can install high-efficiency toilets, faucet aerators, and low-flow showerheads to reduce water volume. Spreading out laundry and dishwasher use throughout the week also helps reduce water stress on the system.
Proper Waste Disposal: Only human waste and toilet paper should be flushed down the toilet. Avoid flushing tissues, diapers, feminine hygiene products, hair, dental floss, and other similar items as they can clog pipes and damage the system. Similarly, avoid washing coffee grounds, eggshells, medication, produce stickers, flour, oil, paint, grease, fat, and dairy products down the sink drain. These items can clog pipes and screens and harm the septic system.
Avoid Harmful Chemicals: Do not use harsh chemicals like bleach, drain cleaners, or antibacterial soaps, as they can kill the good bacteria in the septic system and damage the tank. Choose natural or plant-based cleaning products, and low-phosphorus detergents to reduce nutrient discharge into water bodies.
Maintain the Drainfield: Do not drive or park vehicles over the drainfield. Plant grass or flowers over the treatment area, but avoid fertilizing, watering, or burning. Keep trees, shrubs, and deep-rooted plants away from the area, and do not use it for vegetable gardens or playgrounds.
By following these maintenance tips, homeowners can ensure their septic systems function properly, protecting the environment and human health.
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Frequently asked questions
Nonpoint source _(NPS) pollution refers to diffuse contamination of water or air that does not come from a single source. It is often the result of small amounts of contaminants gathered from a large area.
NPS pollution can come from everyday sources such as fertilizers, pesticides, pet waste, and oil residue washed off streets.
NPS pollution can impact drinking water supplies, recreation, fisheries, and wildlife. It can also cause turbidity in water bodies, reducing light penetration and inhibiting plant growth.
Individuals can properly dispose of waste, reduce water runoff, plant ground cover to control erosion, and use low-phosphorus household products to reduce nutrient discharge into water bodies.
Governments can prioritize funding for NPS pollution control, enforce septic system maintenance, implement public education programs, and collaborate with local communities to develop and enforce regulations.
