Clean Water Program
Effects of Stormwater Runoff
Lake County's lakes, streams, rivers, forests and farms all depend on the replenishing waters of annual precipitation. However, when rain falls on land or impervious areas such as paved streets, parking lots and building roof tops it results in increased peak flows that can wash away soil and sediment, increase stream erosion and cause flooding. Stormwater runoff can change both water quantity and quality affecting our water resources physically, chemically and biologically. Polluted runoff containing oil, grease, chemicals, nutrients, lawn clippings and other yard debris, metals, litter and pathogens for example, can severely reduce water quality. If left unmanaged, runoff stresses our streams, provides extra nutrients for nuisance aquatic weeds and algae blooms, and degrades the beneficial uses of the waters we all enjoy.