City Water Quality Rankings in Ohio
417 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#409
St. Clairsville
County, OH
2 F
#410 Attica
County, OH
0 F
#411 Cadiz
County, OH
0 F
#412 Kings Island
County, OH
0 F
#413 Milford
County, OH
0 F
#414 Nelsonville
County, OH
0 F
#415 Richwood
County, OH
0 F
#416 Van Wert
County, OH
0 F
#417 White Cottage
County, OH
0 F
Frequently Asked Questions
How are city water quality rankings calculated in Ohio?
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 cities in Ohio?
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.