Welcome to the State Water Resources Control Board Welcome to the California Environmental Protection Agency
Governor's Website Visit the Water Board Members Page
My Water Quality
Performance Report

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.
Spill type:   Category 1    Category 2    Category 3

Click on a map icon for incident information.
(Example: "123 Main Street, Sacramento, CA")

Go to county:

Go to Regional Board:

QA Tools

To find a Latitude/Longitude for a point or address, click here.

List of sites whose reported coordinates fall outside reported county