City Water Quality Rankings
11,561 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#169
Clay
County, NY
100 A
#170 Clayton
County, NY
100 A
#171 Clearwater
County, MN
100 A
#172 Clifton
County, CO
100 A
#173 Clinton
County, WA
100 A
#174 Clinton Township
County, MI
100 A
#175 Clyde
County, MI
100 A
#176 Cohasset
County, MN
100 A
#177 Colby
County, KS
100 A
#178 Colchester
County, VT
100 A
#179 College Place
County, WA
100 A
#180 Colleyville
County, TX
100 A
#181 Colonial Heights
County, VA
100 A
#182 Columbus
County, GA
100 A
#183 Commerce
County, GA
100 A
#184 Commerce City
County, CO
100 A
#185 Commerce Township
County, MI
100 A
#186 Concord
County, NC
100 A
#187 Concord
County, CA
100 A
#188 Concord
County, MI
100 A
#189 Converse
County, TX
100 A
#190 Coon Rapids
County, IA
100 A
#191 Corcoran
County, CA
100 A
#192 Corcoran
County, MN
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.