City Water Quality Rankings in California
601 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#361
Turlock
County, CA
94 A
#362 Twentynine Palms
County, CA
94 A
#363 Walnut
County, CA
94 A
#364 Woodlake
County, CA
94 A
#365 Yountville
County, CA
94 A
#366 Greenfield
County, CA
93 A
#367 Milpitas
County, CA
93 A
#368 Montebello
County, CA
93 A
#369 Pico Rivera
County, CA
93 A
#370 San Dimas
County, CA
93 A
#371 Terra Bella
County, CA
93 A
#372 Yucaipa
County, CA
93 A
#373 Big Bear Lake
County, CA
92 A
#374 Blythe
County, CA
92 A
#375 Calabasas
County, CA
92 A
#376 Caruthers
County, CA
92 A
#377 Castroville
County, CA
92 A
#378 Citrus Heights
County, CA
92 A
#379 Clovis
County, CA
92 A
#380 Cudahy
County, CA
92 A
#381 Devore
County, CA
92 A
#382 Dinuba
County, CA
92 A
#383 Hayfork
County, CA
92 A
#384 Healdsburg
County, CA
92 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.