The 2025 Southern California Community Water Systems Atlas
Southern California has a complex network of 663 drinking water systems across six counties: Los Angeles, Kern, Orange, Riverside, San Bernardino, and Ventura. Together, these utilities serve 40 percent of California’s population. Developed in coordination with UC Agriculture and Natural Resources, the Luskin Center for Innovation’s report and companion mapping tool provide the most comprehensive public resource on water systems, shedding light on disparities in water quality, affordability, governance, and climate resilience.
EXPERTS
- Edith B. de Guzman, Water Equity and Adaptation Policy Cooperative Extension Specialist
- Gregory Pierce, Senior Director
- Jennifer Gorman, Graduate Student Researcher
- Lauren Dunlap, Project Manager
- Michael Rincon, Graduate Student Researcher
- Itzel Vasquez-Rodriguez, Graduate Student Researcher
- Vivian Cruz, Graduate Student Researcher
Download the Data
- 2025 System- and County-Level Tabular Data and Data Guide (.xlsx file download)
- 2025 System-Level Geospatial Data (.geojson file access)
- 2025 County-Level Geospatial Data (.geojson file access)
Data from previous Atlas updates:
Learn more about our research on the Human Right to Water, local water supply, and water quality.
