WaterQ

City Water Quality Rankings in California

599 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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#433
Stockton
County, CA
90 A
#434
Tahoe City
County, CA
90 A
#435
Tehachapi
County, CA
90 A
#436
Tustin
County, CA
90 A
#437
Villa Park
County, CA
90 A
#438
Weed
County, CA
90 A
#439
Winton
County, CA
90 A
#440
Yreka
County, CA
90 A
#441
Arnold
County, CA
89 B
#442
Castroville
County, CA
89 B
#443
Indio
County, CA
89 B
#444
Loma Linda
County, CA
89 B
#445
Paicines
County, CA
89 B
#446
Palm Springs
County, CA
89 B
#447
Placerville
County, CA
89 B
#448
Platina
County, CA
89 B
#449
Plymouth
County, CA
89 B
#450
San Juan Bautista
County, CA
89 B
#451
Yucaipa
County, CA
89 B
#452
Compton
County, CA
88 B
#453
Exeter
County, CA
88 B
#454
Forest Falls
County, CA
88 B
#455
Fresno
County, CA
88 B
#456
Fullerton
County, CA
88 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.

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