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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#337
Joshua Tree
County, CA
94 A
#338
Kerman
County, CA
94 A
#339
Kingsburg
County, CA
94 A
#340
La Canada
County, CA
94 A
#341
La Crescenta
County, CA
94 A
#342
Los Altos Hills
County, CA
94 A
#343
Manteca
County, CA
94 A
#344
Mendota
County, CA
94 A
#345
Morro Bay
County, CA
94 A
#346
Newhall
County, CA
94 A
#347
Oceano
County, CA
94 A
#348
Orosi
County, CA
94 A
#349
Palmdale
County, CA
94 A
#350
Paramount
County, CA
94 A
#351
Poway
County, CA
94 A
#352
Red Bluff
County, CA
94 A
#353
Roseville
County, CA
94 A
#354
San Francisco
County, CA
94 A
#355
Santa Maria
County, CA
94 A
#356
Santa Nella
County, CA
94 A
#357
South Pasadena
County, CA
94 A
#358
Sutter Creek
County, CA
94 A
#359
Taft
County, CA
94 A
#360
Three Rivers
County, CA
94 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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