Existing law, the California Emergency Services Act, requires all public water systems, as defined, with 10,000 or more service connections to review and revise their disaster preparedness plans in conjunction with related agencies, including, but not limited to, local fire departments and the Office of Emergency Services to ensure that the plans are sufficient to address possible disaster scenarios.

Existing law requires these public water systems to, following a declared state of emergency, furnish an assessment of their emergency response and recommendations to the Legislature within 6 months after each disaster, and to implement the recommendations in a timely manner. Existing law requires the office to establish emergency response and recovery plans in coordination with these public water systems.