City Water Quality Rankings
11,561 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#217
Davis Junction
County, IL
100 A
#218 Davison
County, MI
100 A
#219 De Smet
County, SD
100 A
#220 Decatur
County, AL
100 A
#221 Decatur
County, GA
100 A
#222 Del Rey
County, CA
100 A
#223 Dell
County, AR
100 A
#224 Delmar
County, MD
100 A
#225 Denair
County, CA
100 A
#226 Derry
County, NH
100 A
#227 Desert Aire
County, WA
100 A
#228 Detroit
County, MI
100 A
#229 Dewitt
County, AR
100 A
#230 Diamond City
County, AR
100 A
#231 Dike
County, IA
100 A
#232 Dillsboro
County, IN
100 A
#233 Discovery Bay
County, CA
100 A
#234 Dixon
County, CA
100 A
#235 Double Springs
County, AL
100 A
#236 Douglas
County, WY
100 A
#237 Douglasville
County, GA
100 A
#238 Dover
County, NH
100 A
#239 Dresden
County, TN
100 A
#240 Dublin
County, GA
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.