Knowledge Base

As stormwater flows over driveways, lawns, streets, and sidewalks it picks up debris, chemicals, dirt and other pollutants. Stormwater can flow into a storm sewer system or directly into a lake, stream, river or wetland. Anything that enters a storm sewer system is discharged untreated into the water bodies we use for swimming, fishing, and providing drinking water. Polluted runoff is the nation’s greatest threat to clean water.