City Water Quality Rankings
11,561 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#11041
Cimarron
County, NM
0 F
#11042 Cisco
County, TX
0 F
#11043 Citronelle
County, AL
0 F
#11044 Clarendon
County, AR
0 F
#11045 Clayton
County, OK
0 F
#11046 Clifton
County, TN
0 F
#11047 Clinton
County, OK
0 F
#11048 Clyde
County, TX
0 F
#11049 Coalgate
County, OK
0 F
#11050 Coffeyville
County, OK
0 F
#11051 Colbert
County, OK
0 F
#11052 Colorado City
County, CO
0 F
#11053 Columbus
County, NC
0 F
#11054 Comfort
County, TX
0 F
#11055 Commerce
County, OK
0 F
#11056 Converse
County, LA
0 F
#11057 Cookson
County, OK
0 F
#11058 Coralville
County, IA
0 F
#11059 Cordell
County, OK
0 F
#11060 Cordova
County, AK
0 F
#11061 Corning
County, IA
0 F
#11062 Corydon
County, IA
0 F
#11063 Coudersport
County, PA
0 F
#11064 Council Hill
County, OK
0 F
Frequently Asked Questions
How are city water quality rankings calculated?
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 US cities directly?
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.