Sanitary Sewer Overflow (SSO) Incident Map
A sanitary sewer overflow (SSO) is any overflow, spill, release, discharge or diversion of untreated or partially treated wastewater from a sanitary sewer system. SSOs often contain high levels of pollutants and may threaten public health, adversely affect aquatic life, and impair the recreational use of surface waters.
The data displayed in this map represents SSO reports for individual locations where sewage was discharged from a sanitary sewer system enrolled under the Statewide General Waste Discharge Requirements for Sanitary Sewer Systems Order, WQO No. 2006-0003-DWQ (the Statewide Sanitary Sewer Order). SSO incidents from a sanitary sewer system may result in discharges from multiple locations and have more than one SSO report in the database.
The data used to display the SSO reports on these maps is dynamic and may change without notice, based on the latest information for SSO reports (certified or amended reports only) from individual agencies enrolled under the Statewide Sanitary Sewer Order. The State Water Resources Control Boards provide a hosting service of all SSO reports and have "view only" access to this information. For specific questions related to SSO incidents or SSO reports, please contact the appropriate indicated reporting agency or responsible party.
For additional information about the Statewide Sanitary Sewer Order or SSO database, please visit the Sanitary Sewer Overflow Program page at: https://www.waterboards.ca.gov/water_issues/programs/sso/.
Sanitary Sewer Overflows
Note: Map does not include spills from sewage treatment plants.
Click on a map icon for incident information.