City Water Quality Rankings
11,696 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#10345
Mechanicville
County, NY
45 D
#10346 Mt. Morris
County, IL
45 D
#10347 Nettie
County, WV
45 D
#10348 Niederwald
County, TX
45 D
#10349 Norristown
County, PA
45 D
#10350 Phoenixville
County, PA
45 D
#10351 Plano
County, IL
45 D
#10352 Renovo
County, PA
45 D
#10353 Rio Grande City
County, TX
45 D
#10354 Stuart
County, FL
45 D
#10355 Valdese
County, NC
45 D
#10356 Wasilla
County, AK
45 D
#10357 Yerington
County, NV
45 D
#10358 Aguas Buenas
County, PR
44 F
#10359 Albion
County, NE
44 F
#10360 Alice
County, TX
44 F
#10361 Altamont
County, UT
44 F
#10362 Ballston Spa
County, NY
44 F
#10363 Belpre
County, OH
44 F
#10364 Brewton
County, AL
44 F
#10365 Butler
County, TN
44 F
#10366 Cairo
County, NY
44 F
#10367 Chicago
County, IL
44 F
#10368 Clearwater
County, KS
44 F
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.