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My Water Quality
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Water Boards Data Maps

Data Maps

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* * * NOTICE * * *
This web site will be unavailable from 6 PM Friday, 4/8/16, until 6 AM Monday, 4/11/16, for annual maintenance and repairs at CalEPA.
It's likely that the maintenance will be completed earlier than 6 AM Monday so please check back over the weekend if desired.
Thank you for your patience.   (posted 04/04/16)

Areas of Special Biological Significance (ASBS)

Drinking Water


Financial Assistance Programs

Impaired Water Bodies

My Water Quality Portals - From the Water Quality Monitoring Council

Nitrate in Groundwater

Onsite Wastewater Treatment (Septic) Systems

Regional Water Quality Control Boards

Sanitary Sewer Overflows (SSO)

  • SSO Incident Map
    Map represents SSO reports for individual locations where sewage was discharged from a sanitary sewer system enrolled under the Statewide Sanitary Sewer Order.
  • Private Lateral Sewage Discharge Incident Map
    Map contains reports for individual locations where sewage was discharged from a Private Lateral Sewage Discharge (PLSD) event voluntarily reported in accordance with the Statewide Sanitary Sewer Order.

Water Rights

Data Map Services

Map services for the spatial data provided by many of the map applications listed above are open and available for public developer use via our GIS server endpoint. Map services are generally provided in ESRI REST, OGC WMS and KML formats. For questions regarding the use of the map services, please contact GIS@waterboards.ca.gov.