State rankings

California water-system rankings

Community water systems in California ranked by PurityRadar safety score — from EPA violations, enforcement, and PFAS data.

Lowest-scoring systems in California

Ranked lowest score first. Population shown for context.

No scored community water systems found for California.

California directory → All states

Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.