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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#265
Strathmore
County, CA
96 A
#266
Tracy
County, CA
96 A
#267
Trinidad
County, CA
96 A
#268
Twin Peaks
County, CA
96 A
#269
Victorville
County, CA
96 A
#270
Westley
County, CA
96 A
#271
Buena Park
County, CA
95 A
#272
El Monte
County, CA
95 A
#273
Fallbrook
County, CA
95 A
#274
Hanford
County, CA
95 A
#275
Hemet
County, CA
95 A
#276
Herlong
County, CA
95 A
#277
Inverness
County, CA
95 A
#278
Jurupa Valley
County, CA
95 A
#279
Maxwell
County, CA
95 A
#280
Mckinleyville
County, CA
95 A
#281
Novato
County, CA
95 A
#282
Orange
County, CA
95 A
#283
San Luis Obispo
County, CA
95 A
#284
San Marcos
County, CA
95 A
#285
Santa Fe Springs
County, CA
95 A
#286
Soledad
County, CA
95 A
#287
Sutter Creek
County, CA
95 A
#288
Ukiah
County, CA
95 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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