City Water Quality Rankings
11,696 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#265
Davis Junction
County, IL
100 A
#266 Davison
County, MI
100 A
#267 Dayton
County, MN
100 A
#268 De Smet
County, SD
100 A
#269 Decatur
County, AL
100 A
#270 Decatur
County, GA
100 A
#271 Dekalb
County, MO
100 A
#272 Del Rey
County, CA
100 A
#273 Dell
County, AR
100 A
#274 Delmar
County, DE
100 A
#275 Delmar
County, MD
100 A
#276 Denair
County, CA
100 A
#277 Derry
County, NH
100 A
#278 Desert Aire
County, WA
100 A
#279 Detroit
County, MI
100 A
#280 Dewitt
County, AR
100 A
#281 Diamond City
County, AR
100 A
#282 Dike
County, IA
100 A
#283 Dillsboro
County, IN
100 A
#284 Dinwiddie
County, VA
100 A
#285 Discovery Bay
County, CA
100 A
#286 Dixon
County, CA
100 A
#287 Dorchester
County, TX
100 A
#288 Double Springs
County, AL
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.