WaterQ

City Water Quality Rankings in California

601 cities ranked by drinking water quality.

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Popular city water quality comparisons

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#1
Alpine Meadows
County, CA
100 A
#2
American Canyon
County, CA
100 A
#3
Antioch
County, CA
100 A
#4
Aptos
County, CA
100 A
#5
Arcadia
County, CA
100 A
#6
Arcata
County, CA
100 A
#7
Armona
County, CA
100 A
#8
Aromas
County, CA
100 A
#9
Arrowbear Lake
County, CA
100 A
#10
Azusa
County, CA
100 A
#11
Belmont
County, CA
100 A
#12
Bermuda Dunes
County, CA
100 A
#13
Beverly Hills
County, CA
100 A
#14
Big Bear City
County, CA
100 A
#15
Biola
County, CA
100 A
#16
Bloomington
County, CA
100 A
#17
Blue Lake
County, CA
100 A
#18
Bodega Bay
County, CA
100 A
#19
Brea
County, CA
100 A
#20
Bridgeport
County, CA
100 A
#21
Brisbane
County, CA
100 A
#22
Burbank
County, CA
100 A
#23
Burlingame
County, CA
100 A
#24
Buttonwillow
County, CA
100 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.

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