Who regulates water systems in California

State Water Resources Control Board — Division of Drinking Water serves as the primacy agency for California public water systems.

Official state drinking water program →

Federal baseline requirements — coliform monitoring, lead and copper, disinfection byproducts, Consumer Confidence Reports, PFAS, and lead service line inventories — apply to California systems alongside state rules.

What California systems typically track

• Routine coliform sampling on a state-approved siting plan
• Lead and copper tap sampling and service line inventory updates
• Consumer Confidence Report delivery (community systems)
• Operator certification renewals
• PFAS monitoring under the 2024 federal rule
• Sanitary survey corrective actions