City Water Quality Rankings
11,561 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#193
Cord
County, AR
100 A
#194 Cordova
County, AL
100 A
#195 Core
County, WV
100 A
#196 Cornell
County, WI
100 A
#197 Cosby
County, MO
100 A
#198 Costa Mesa
County, CA
100 A
#199 Cottonwood
County, MN
100 A
#200 Cottrellville
County, MI
100 A
#201 Coulee Dam
County, WA
100 A
#202 Covert
County, MI
100 A
#203 Coward
County, SC
100 A
#204 Cowarts
County, AL
100 A
#205 Cozad
County, NE
100 A
#206 Crawfordsville
County, AR
100 A
#207 Crossville
County, AL
100 A
#208 Crystal
County, MN
100 A
#209 Cumberland
County, VA
100 A
#210 Cumberland
County, WI
100 A
#211 Cut And Shoot
County, TX
100 A
#212 Cutten
County, CA
100 A
#213 Dakota Dunes
County, SD
100 A
#214 Dalton Gardens
County, ID
100 A
#215 Dalworthington Gardens
County, TX
100 A
#216 David City
County, NE
100 A
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.