City Water Quality Rankings in California
599 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#505
Hydesville
County, CA
84 B
#506 Ivanhoe
County, CA
84 B
#507 Olympic Valley
County, CA
84 B
#508 Pomona
County, CA
84 B
#509 Sanger
County, CA
84 B
#510 South Lake Tahoe
County, CA
84 B
#511 St. Helena
County, CA
84 B
#512 Talmage
County, CA
84 B
#513 Calistoga
County, CA
83 B
#514 La Grange
County, CA
83 B
#515 Arvin
County, CA
82 B
#516 Los Angeles
County, CA
82 B
#517 Paso Robles
County, CA
82 B
#518 South Gate
County, CA
82 B
#519 Trabuco Canyon
County, CA
82 B
#520 Dunsmuir
County, CA
80 B
#521 Gustine
County, CA
80 B
#522 Ione
County, CA
80 B
#523 Monterey Park
County, CA
80 B
#524 Newport Beach
County, CA
80 B
#525 Three Rivers
County, CA
80 B
#526 Bakersfield
County, CA
79 B
#527 California City
County, CA
79 B
#528 Lakeside
County, CA
79 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.