California Tap Water Quality by City

EPA UCMR5 PFAS monitoring data, violation history, and filter recommendations for 15 cities across California. All data sourced directly from federal EPA databases.

California water quality varies significantly by city and water system. The EPA's UCMR5 monitoring program tested all systems serving 3,300+ people for 29 PFAS compounds between 2023 and 2025. In California, 11 of the 15 tracked cities returned results with active MCL violations — meaning detected PFAS levels exceed the EPA's legally enforceable maximum.

Click any city above for a full breakdown of detected compounds, violation history, water hardness data, and certified filter recommendations matched to the actual contaminant profile of that system.

Enter your ZIP code to pull the full EPA report for your specific water system — including PFAS readings, CCR violations, and filter recommendations.