City Water Quality Rankings in California
601 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#193
Menlo Park
County, CA
98 A
#194 Midway City
County, CA
98 A
#195 Mira Loma
County, CA
98 A
#196 Modesto
County, CA
98 A
#197 Pacifica
County, CA
98 A
#198 Palm Desert
County, CA
98 A
#199 Palomar Mtn Road
County, CA
98 A
#200 Petaluma
County, CA
98 A
#201 Pinedale
County, CA
98 A
#202 Pittsburg
County, CA
98 A
#203 Pixley
County, CA
98 A
#204 Rancho Cordova
County, CA
98 A
#205 Redway
County, CA
98 A
#206 Reedley
County, CA
98 A
#207 Rosemead
County, CA
98 A
#208 Santee
County, CA
98 A
#209 Scotts Valley
County, CA
98 A
#210 Solvang
County, CA
98 A
#211 South San Francisco
County, CA
98 A
#212 Susanville
County, CA
98 A
#213 Sutter
County, CA
98 A
#214 Tahoe Vista
County, CA
98 A
#215 Temescal Valley
County, CA
98 A
#216 Truckee
County, CA
98 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.