What is stormwater?

Stormwater is generated by rainwater and snowmelt runoff from streets, parking lots, building rooftops, lawns, farms, construction sites, industrial sites and many other aspects of the landscape.  This runoff picks up fertilizers, dirt, pesticides, oil and grease, and many other pollutants on the way to our rivers, lakes, and coastal waters.  Stormwater runoff is our most common cause of water pollution.