City Water Quality Rankings in California
601 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#481
Yreka
County, CA
88 B
#482 Burney
County, CA
87 B
#483 Edwards Afb
County, CA
87 B
#484 Julian
County, CA
87 B
#485 Platina
County, CA
87 B
#486 Stockton
County, CA
87 B
#487 Tulare
County, CA
87 B
#488 Clearlake
County, CA
86 B
#489 Exeter
County, CA
86 B
#490 Gridley
County, CA
86 B
#491 Highland
County, CA
86 B
#492 Lynwood
County, CA
86 B
#493 Pinecrest
County, CA
86 B
#494 Redlands
County, CA
86 B
#495 San Diego
County, CA
86 B
#496 Sierra Madre
County, CA
86 B
#497 Torrance
County, CA
86 B
#498 Boulder Creek
County, CA
85 B
#499 Delhi
County, CA
85 B
#500 Independence
County, CA
85 B
#501 Jackson
County, CA
85 B
#502 Willow Creek
County, CA
85 B
#503 Angels Camp
County, CA
84 B
#504 Bolinas
County, CA
84 B
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.