City Water Quality Rankings in California
599 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#193
Tahoe Vista
County, CA
98 A
#194 Temescal Valley
County, CA
98 A
#195 Truckee
County, CA
98 A
#196 Twain Harte
County, CA
98 A
#197 Vandenberg Sfb
County, CA
98 A
#198 Visalia
County, CA
98 A
#199 Wasco
County, CA
98 A
#200 Westlake Village
County, CA
98 A
#201 Wildomar
County, CA
98 A
#202 Woodland
County, CA
98 A
#203 Yosemite Np
County, CA
98 A
#204 Yucca Valley
County, CA
98 A
#205 Adelanto
County, CA
97 A
#206 Anaheim
County, CA
97 A
#207 Apple Valley
County, CA
97 A
#208 Armona
County, CA
97 A
#209 Camarillo
County, CA
97 A
#210 Crescent City
County, CA
97 A
#211 Delano
County, CA
97 A
#212 Downey
County, CA
97 A
#213 Guerneville
County, CA
97 A
#214 Lakeport
County, CA
97 A
#215 Madera
County, CA
97 A
#216 Pacific Grove
County, CA
97 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.