City Water Quality Rankings in California
601 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#217
Vandenberg Sfb
County, CA
98 A
#218 Visalia
County, CA
98 A
#219 Wasco
County, CA
98 A
#220 Westlake Village
County, CA
98 A
#221 Wildomar
County, CA
98 A
#222 Woodland
County, CA
98 A
#223 Yucca Valley
County, CA
98 A
#224 Adelanto
County, CA
97 A
#225 Angwin
County, CA
97 A
#226 Apple Valley
County, CA
97 A
#227 Camarillo
County, CA
97 A
#228 Crescent City
County, CA
97 A
#229 Delano
County, CA
97 A
#230 Downey
County, CA
97 A
#231 Guerneville
County, CA
97 A
#232 Lakeport
County, CA
97 A
#233 Madera
County, CA
97 A
#234 Pacific Grove
County, CA
97 A
#235 Pasadena
County, CA
97 A
#236 Quartz Hill
County, CA
97 A
#237 Quincy
County, CA
97 A
#238 San Luis Obispo
County, CA
97 A
#239 Sonoma
County, CA
97 A
#240 29 Palms
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.