City Water Quality Rankings in California
599 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#337
Poway
County, CA
94 A
#338 Redway
County, CA
94 A
#339 Roseville
County, CA
94 A
#340 Santa Barbara
County, CA
94 A
#341 Santa Maria
County, CA
94 A
#342 Santa Nella
County, CA
94 A
#343 South Pasadena
County, CA
94 A
#344 Springville
County, CA
94 A
#345 Taft
County, CA
94 A
#346 Turlock
County, CA
94 A
#347 Walnut
County, CA
94 A
#348 Woodlake
County, CA
94 A
#349 Atascadero
County, CA
93 A
#350 Cabazon
County, CA
93 A
#351 Devore
County, CA
93 A
#352 Dinuba
County, CA
93 A
#353 Greenfield
County, CA
93 A
#354 Imperial
County, CA
93 A
#355 Lake Almanor
County, CA
93 A
#356 Laytonville
County, CA
93 A
#357 Milpitas
County, CA
93 A
#358 Montebello
County, CA
93 A
#359 Oak View
County, CA
93 A
#360 Pico Rivera
County, CA
93 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.