Storm Sewer Drains
Storm sewers are many times a direct link to a stream. Pollutants entering the storm sewer will reach the stream. Parking your car on your lawn when washing it will keep soaps out of the storm sewer and stream.
For reducing your impacts on Non-Point Source Pollution
For more information try the following links
Pennsylvania Association of Conservation Districts
Residential nonpoint source pollution
EPA Nonpoint Source Pollution Documents