City Water Quality Rankings in California
601 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#169
Bellflower
County, CA
98 A
#170 Boron
County, CA
98 A
#171 Borrego Springs
County, CA
98 A
#172 Carmichael
County, CA
98 A
#173 Chester
County, CA
98 A
#174 Colton
County, CA
98 A
#175 Corte Madera
County, CA
98 A
#176 Del Mar
County, CA
98 A
#177 Desert Hot Springs
County, CA
98 A
#178 East Palo Alto
County, CA
98 A
#179 El Centro
County, CA
98 A
#180 Elmira
County, CA
98 A
#181 Esparto
County, CA
98 A
#182 Fortuna
County, CA
98 A
#183 Galt
County, CA
98 A
#184 Grover Beach
County, CA
98 A
#185 Half Moon Bay
County, CA
98 A
#186 Hawthorne
County, CA
98 A
#187 Hillsborough
County, CA
98 A
#188 La Verne
County, CA
98 A
#189 Laguna Beach
County, CA
98 A
#190 Lompoc
County, CA
98 A
#191 Los Molinos
County, CA
98 A
#192 Mariposa
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.