Stormwater is rainwater that runs off impervious surfaces (e.g. rooftops, parking lots, driveways, etc.) as opposed to soaking into the ground. In developed areas, stormwater typically picks up contaminants like detergents from car washing, motor oil, and fertilizers as it flows.
These nonstormwater materials can eventually end up in our creeks and streams. When left uncontrolled, this water pollution can destroy aquatic and wildlife habitats, and can threaten public health due to the contamination of food, drinking water supplies, and recreational waterways.