The City’s stormwater system routes our rainwater runoff directly to its destination – our wetlands. The stormdrain system includes the street stormdrain inlets and ditches, which flow into our watershed’s creeks and wetlands. It also includes various constructed basins and ponds designed to slow it down, spread it out and let it sink. Stormwater water, unlike the wastewater from the drains and toilets in your house, is not treated before going into the creeks and wetlands. Litter, dripping car fluids, car wash soap, dirt, and anything that someone throws into the gutter or pours down the storm drain inlets goes into the wetlands and the Napa River, carrying pollutants to our wetlands and river.
What’s the Difference Between Stormwater and Sewer?
Please remember - Only Rain Down The Drain! Call our Stormwater Hotline at 647-4550 if you see a discharge to the gutter or stormdrain inlet!
Information for businesses
Information for contractors & developers
Municipal Small Storm Sewer System Permit (MS4) General Permit, WQO 2003-0005 DWQ, Attachment 4