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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#457
Farmersville
County, CA
88 B
#458
Fullerton
County, CA
88 B
#459
Gonzales
County, CA
88 B
#460
Green Valley
County, CA
88 B
#461
Happy Camp
County, CA
88 B
#462
Hayward
County, CA
88 B
#463
Indio
County, CA
88 B
#464
Inglewood
County, CA
88 B
#465
Laton
County, CA
88 B
#466
Middletown
County, CA
88 B
#467
Montague
County, CA
88 B
#468
Mount Hermon
County, CA
88 B
#469
Napa
County, CA
88 B
#470
Newman
County, CA
88 B
#471
Planada
County, CA
88 B
#472
Port Hueneme
County, CA
88 B
#473
Represa
County, CA
88 B
#474
Running Springs
County, CA
88 B
#475
Santa Ana
County, CA
88 B
#476
Seeley
County, CA
88 B
#477
Ventura
County, CA
88 B
#478
Watsonville
County, CA
88 B
#479
West Covina
County, CA
88 B
#480
Winton
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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