City Water Quality Rankings in Iowa
268 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#217
Columbus Junction
County, IA
56 D
#218 Marengo
County, IA
56 D
#219 Nashua
County, IA
56 D
#220 Marshalltown
County, IA
55 D
#221 Sidney
County, IA
55 D
#222 Williamsburg
County, IA
55 D
#223 Epworth
County, IA
54 D
#224 Farley
County, IA
54 D
#225 Garner
County, IA
54 D
#226 Oskaloosa
County, IA
54 D
#227 Mount Pleasant
County, IA
52 D
#228 Norwalk
County, IA
52 D
#229 Adel
County, IA
50 D
#230 Anamosa
County, IA
50 D
#231 Bedford
County, IA
50 D
#232 Glenwood
County, IA
50 D
#233 Griswold
County, IA
50 D
#234 Mediapolis
County, IA
50 D
#235 Kalona
County, IA
48 D
#236 Malvern
County, IA
48 D
#237 Mitchellville
County, IA
48 D
#238 Maquoketa
County, IA
47 D
#239 Panora
County, IA
46 D
#240 Toledo
County, IA
42 F
Frequently Asked Questions
How are city water quality rankings calculated in Iowa?
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 Iowa?
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.