City Water Quality Rankings
11,561 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#145
Carlton
County, MN
100 A
#146 Carrboro
County, NC
100 A
#147 Carrollton
County, GA
100 A
#148 Carrollton
County, TX
100 A
#149 Carthage
County, MO
100 A
#150 Carthage
County, AR
100 A
#151 Caseville
County, MI
100 A
#152 Casselton
County, ND
100 A
#153 Castaic
County, CA
100 A
#154 Cayucos
County, CA
100 A
#155 Cedarpines Park
County, CA
100 A
#156 Cedarville
County, AR
100 A
#157 Chamberlain
County, SD
100 A
#158 Chapin
County, SC
100 A
#159 Chatham
County, IL
100 A
#160 Chesaning
County, MI
100 A
#161 Chesterfield
County, VA
100 A
#162 Chrisfield
County, MD
100 A
#163 Clare
County, MI
100 A
#164 Claremont
County, CA
100 A
#165 Clarendon
County, NY
100 A
#166 Clarendon
County, VT
100 A
#167 Clarkston
County, MI
100 A
#168 Clarkston
County, WA
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.