City Water Quality Rankings in California
599 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#577
Le Grand
County, CA
44 F
#578 Havasu Lake
County, CA
41 F
#579 Chino Hills
County, CA
40 F
#580 North Edwards
County, CA
33 F
#581 Valley Center
County, CA
32 F
#582 Winterhaven
County, CA
32 F
#583 Lemoore
County, CA
27 F
#584 Jamul
County, CA
24 F
#585 Needles
County, CA
24 F
#586 Dos Palos
County, CA
20 F
#587 Alpine
County, CA
12 F
#588 Pala
County, CA
12 F
#589 Cutler
County, CA
9 F
#590 Campo
County, CA
0 F
#591 El Cajon
County, CA
0 F
#592 Friant
County, CA
0 F
#593 Geyserville
County, CA
0 F
#594 Hoopa
County, CA
0 F
#595 Hughson
County, CA
0 F
#596 Lindsay
County, CA
0 F
#597 Loleta
County, CA
0 F
#598 Pauma Valley
County, CA
0 F
#599 Richgrove
County, CA
0 F
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.