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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#481
Highland
County, CA
86 B
#482
Jackson
County, CA
86 B
#483
King George
County, CA
86 B
#484
Livingston
County, CA
86 B
#485
Los Alamitos
County, CA
86 B
#486
Lynwood
County, CA
86 B
#487
Parlier
County, CA
86 B
#488
Redlands
County, CA
86 B
#489
Sierra Madre
County, CA
86 B
#490
Smith River
County, CA
86 B
#491
Torrance
County, CA
86 B
#492
Weaverville
County, CA
86 B
#493
West Sacramento
County, CA
86 B
#494
Boulder Creek
County, CA
85 B
#495
Delhi
County, CA
85 B
#496
Edwards Afb
County, CA
85 B
#497
June Lake
County, CA
85 B
#498
San Diego
County, CA
85 B
#499
Sea Ranch
County, CA
85 B
#500
Alturas
County, CA
84 B
#501
Biggs
County, CA
84 B
#502
Bolinas
County, CA
84 B
#503
Ceres
County, CA
84 B
#504
Fairfield
County, CA
84 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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