City Water Quality Rankings in California
601 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#553
Bradley
County, CA
70 C
#554 Calexico
County, CA
70 C
#555 Huron
County, CA
70 C
#556 Mccloud
County, CA
70 C
#557 Paradise
County, CA
70 C
#558 Groveland
County, CA
69 C
#559 Avenal
County, CA
68 C
#560 Vista
County, CA
68 C
#561 Chico
County, CA
67 C
#562 Tuolumne
County, CA
67 C
#563 Lebec
County, CA
66 C
#564 Tipton
County, CA
66 C
#565 Kettleman City
County, CA
65 C
#566 Lancaster
County, CA
64 C
#567 Banning
County, CA
62 C
#568 Portola
County, CA
62 C
#569 Salinas
County, CA
62 C
#570 Porterville
County, CA
61 C
#571 Signal Hill
County, CA
60 C
#572 Pine Valley
County, CA
57 D
#573 Norco
County, CA
54 D
#574 Pala
County, CA
54 D
#575 Chino
County, CA
53 D
#576 Colusa
County, CA
50 D
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.