Combined Risk Assessment - Domestic Wells and State Small Water Systems

This web experience contains a dashboard that displays spatial data and summary statistics for the 2025 Risk Assessment for domestic wells and state small water systems. Users can navigate between four tabs that display the combined risk as well as specific risk indicators for water quality, water shortage, and socioeconomic risk. Users can filter the map display and summary statistics to specific geographic areas, distance to a community water system, or risk bin. Water quality data is from the State Water Resources Control Board Aquifer Risk Map. Water shortage data is from the Department of Water Resources Water Shortage Vulnerability Assessment Scoring. Socioeconomic data is from the Office of Environmental Health Hazard Assessment. Domestic well counts are from the Department of Water Resources OSWCR database. State small water system counts are from the Division of Drinking Water. For more information, including the methodology write-up, please refer to the SWRCB Needs Assessment homepage. To connect to the GIS data in this dashboard and the GIS data for previous years risk assessments, please use the links below: 2025 Risk Assessment REST Endpoint URL/SWRCB Portal page 2024 Risk Assessment REST Endpoint URL/SWRCB Portal page 2023 Risk Assessment REST Endpoint URL/SWRCB Portal page 2022 Risk Assessment REST Endpoint URL/SWRCB Portal page