Stormwater is rainwater that picks up pollutants from surfaces as it flows through our urban landscapes. It then flows from the curb and gutter through the storm drain system to local creeks and finally to the San Francisco Bay. The storm drain system includes the inlets and underground pipes that help regulate flooding during rain events. It is part of the broader watershed, which is the area of land that channels water into creeks and the Bay.
Because stormwater is not treated, everyone must help keep pollutants from entering our storm drain system. Only rain should flow into storm drains. Report accidental spills, illegal dumping, and improperly stored materials to the City. Please contact us when:
- you observe anyone pouring or dumping material into the storm drain, or if you see dumped wastes and materials in or near the storm drain or on the street;
- there are unusual odors in or near the storm drain, indicating a potential hazardous spill;
- you observe a sanitary sewer overflowing into the street or storm drain; or
- the storm drain system has larger than normal flows during dry-weather periods.
Find out more about how you can keep stormwater clean on our Stormwater Pollution Prevention pages for Residents and for Businesses.