City Water Quality Rankings in California
599 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#217
Pasadena
County, CA
97 A
#218 Quartz Hill
County, CA
97 A
#219 Quincy
County, CA
97 A
#220 Rosemead
County, CA
97 A
#221 Sonoma
County, CA
97 A
#222 Willits
County, CA
97 A
#223 Arroyo Grande
County, CA
96 A
#224 Bellflower
County, CA
96 A
#225 Benicia
County, CA
96 A
#226 Bodega Bay
County, CA
96 A
#227 Brownsville
County, CA
96 A
#228 Carmichael
County, CA
96 A
#229 Caruthers
County, CA
96 A
#230 Chowchilla
County, CA
96 A
#231 Coachella
County, CA
96 A
#232 Coalinga
County, CA
96 A
#233 Elizabeth Lake
County, CA
96 A
#234 Foresthill
County, CA
96 A
#235 Fort Irwin
County, CA
96 A
#236 Frazier Park
County, CA
96 A
#237 Fremont
County, CA
96 A
#238 Georgetown
County, CA
96 A
#239 Glendora
County, CA
96 A
#240 Heber
County, CA
96 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.