WaterQ

City Water Quality Rankings in California

601 cities ranked by drinking water quality.

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Popular city water quality comparisons

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Trending Cities

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#241
Anaheim
County, CA
96 A
#242
Arnold
County, CA
96 A
#243
Arroyo Grande
County, CA
96 A
#244
Beaumont
County, CA
96 A
#245
Benicia
County, CA
96 A
#246
Brownsville
County, CA
96 A
#247
Chowchilla
County, CA
96 A
#248
Coachella
County, CA
96 A
#249
Coalinga
County, CA
96 A
#250
Elizabeth Lake
County, CA
96 A
#251
Foresthill
County, CA
96 A
#252
Fort Irwin
County, CA
96 A
#253
Fremont
County, CA
96 A
#254
Georgetown
County, CA
96 A
#255
Gilroy
County, CA
96 A
#256
Glendora
County, CA
96 A
#257
Hanford
County, CA
96 A
#258
Heber
County, CA
96 A
#259
Hume
County, CA
96 A
#260
Jamestown
County, CA
96 A
#261
La Puente
County, CA
96 A
#262
Lakewood
County, CA
96 A
#263
Lower Lake
County, CA
96 A
#264
Manhattan Beach
County, CA
96 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.

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