City Water Quality Rankings in California
601 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#409
Compton
County, CA
91 A
#410 Forest Falls
County, CA
91 A
#411 Forestville
County, CA
91 A
#412 Grand Terrace
County, CA
91 A
#413 King George
County, CA
91 A
#414 Los Banos
County, CA
91 A
#415 Mcfarland
County, CA
91 A
#416 Orland
County, CA
91 A
#417 Oxnard
County, CA
91 A
#418 Riverdale
County, CA
91 A
#419 Sacramento
County, CA
91 A
#420 Simi Valley
County, CA
91 A
#421 Arbuckle
County, CA
90 A
#422 Beale Afb
County, CA
90 A
#423 Brawley
County, CA
90 A
#424 Brentwood
County, CA
90 A
#425 Cambria
County, CA
90 A
#426 Daly City
County, CA
90 A
#427 Fall River Mills
County, CA
90 A
#428 Fowler
County, CA
90 A
#429 Fresno
County, CA
90 A
#430 La Habra
County, CA
90 A
#431 Merced
County, CA
90 A
#432 Oceanside
County, CA
90 A
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.