City Water Quality Rankings
11,696 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#169
Carbon Hill
County, AL
100 A
#170 Carle Place
County, NY
100 A
#171 Carleton
County, MI
100 A
#172 Carlisle
County, AR
100 A
#173 Carlsbad
County, CA
100 A
#174 Carlton
County, MN
100 A
#175 Carpinteria
County, CA
100 A
#176 Carrboro
County, NC
100 A
#177 Carrollton
County, GA
100 A
#178 Carrollton
County, TX
100 A
#179 Carthage
County, AR
100 A
#180 Carthage
County, MO
100 A
#181 Caseville
County, MI
100 A
#182 Casselton
County, ND
100 A
#183 Castaic
County, CA
100 A
#184 Cayucos
County, CA
100 A
#185 Cazenovia
County, NY
100 A
#186 Cedar Hill
County, TX
100 A
#187 Cedarpines Park
County, CA
100 A
#188 Cedarville
County, AR
100 A
#189 Central City
County, NE
100 A
#190 Cerritos
County, CA
100 A
#191 Chamberlain
County, SD
100 A
#192 Chapin
County, SC
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.