What is stormwater?
Stormwater is rain or snow melt that runs off impervious surfaces such as streets, sidewalks, parking lots and roofs instead of being absorbed into the ground. As the water flows over theses surfaces it picks up pollutants including sediment, petroleum products, pesticides, fertilizers and bacteria before it enters a storm drain and is carried, untreated, to the nearest water body. The more impervious surface in a given area, the greater the amount of stormwater runoff and, therefore, the great the potential for pollution to local lakes, rivers and streams.
What are the impacts of stormwater runoff?