What is nonpoint source pollution? It occurs when precipitation (rain or melting snow) carries both natural and human-made pollutants through the ground and into the water supply. Nonpoint source pollution does not come from one measurable source and can also be described as the combination of all the pollution every person creates in their daily life - a little spill here, a few drips there.
According to the US EPA, both urban and suburban areas increase the amount of pollutants that are carried into our waters. Hard surfaces, like pavement, prevent rain water and melting snow from seeping into the ground, thus creating a greatly increased volume of storm water runoff. The most common pollutants "include:
- Sediment
- Oil, grease and toxic chemicals from motor vehicles
- Pesticides and nutrients from lawns and gardens
- Viruses, bacteria and nutrients from pet waste and failing septic systems
- Road salts
- Heavy metals from roof shingles, motor vehicles and other sources
- Thermal pollution from dark impervious surfaces such as streets and rooftops
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