City Water Quality Rankings
11,696 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#7201
Coamo
County, PR
80 B
#7202 Cole Camp
County, MO
80 B
#7203 Colorado City
County, AZ
80 B
#7204 Columbus
County, IN
80 B
#7205 Combined Locks
County, WI
80 B
#7206 Constantine
County, MI
80 B
#7207 Corinth
County, KY
80 B
#7208 Corinth
County, MS
80 B
#7209 Cornwall-On-Hudson
County, NY
80 B
#7210 Countryside
County, IL
80 B
#7211 Crossville
County, IL
80 B
#7212 Daisetta
County, TX
80 B
#7213 Dallastown
County, PA
80 B
#7214 Davis
County, IL
80 B
#7215 Dekalb
County, MS
80 B
#7216 Del Rio
County, TX
80 B
#7217 Delavan
County, IL
80 B
#7218 Delmar
County, NY
80 B
#7219 Denton
County, TX
80 B
#7220 Denver
County, NC
80 B
#7221 Denver
County, PA
80 B
#7222 Desoto
County, IL
80 B
#7223 Diana
County, TX
80 B
#7224 Dixon
County, IL
80 B
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.