City Water Quality Rankings in California
599 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#457
Gonzales
County, CA
88 B
#458 Gridley
County, CA
88 B
#459 Hayward
County, CA
88 B
#460 Inglewood
County, CA
88 B
#461 Julian
County, CA
88 B
#462 Napa
County, CA
88 B
#463 Newman
County, CA
88 B
#464 Pinecrest
County, CA
88 B
#465 Port Hueneme
County, CA
88 B
#466 Running Springs
County, CA
88 B
#467 Santa Ana
County, CA
88 B
#468 Ventura
County, CA
88 B
#469 West Covina
County, CA
88 B
#470 Big Bear Lake
County, CA
87 B
#471 Brooks
County, CA
87 B
#472 Burney
County, CA
87 B
#473 Clearlake
County, CA
87 B
#474 Cobb
County, CA
87 B
#475 Independence
County, CA
87 B
#476 Shingle Springs
County, CA
87 B
#477 Watsonville
County, CA
87 B
#478 Willow Creek
County, CA
87 B
#479 Angels Camp
County, CA
86 B
#480 Blythe
County, CA
86 B
Frequently Asked Questions
How are city water quality rankings calculated in California?
WaterQ city rankings are based on EPA SDWIS data across local public water systems, including contaminant detections, compliance violations, and recency-weighted score signals.
Can I compare two cities in California?
Yes. Use the city comparison links on this page or open the Compare tool to evaluate two cities side by side on score, grade, and water system coverage.
How often does WaterQ refresh city data?
City-level metrics refresh when new EPA data is processed. Check city pages for latest score and violation context.