City Water Quality Rankings in Iowa
270 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#217
Calmar
County, IA
60 C
#218 Williamsburg
County, IA
59 D
#219 West Branch
County, IA
58 D
#220 Carlisle
County, IA
57 D
#221 Columbus Junction
County, IA
56 D
#222 Marengo
County, IA
56 D
#223 Nashua
County, IA
56 D
#224 Marshalltown
County, IA
55 D
#225 Epworth
County, IA
54 D
#226 Farley
County, IA
54 D
#227 Garner
County, IA
54 D
#228 Malvern
County, IA
54 D
#229 Maquoketa
County, IA
54 D
#230 Oskaloosa
County, IA
54 D
#231 Griswold
County, IA
52 D
#232 Kalona
County, IA
52 D
#233 Mount Pleasant
County, IA
52 D
#234 Norwalk
County, IA
52 D
#235 Sidney
County, IA
52 D
#236 Anamosa
County, IA
51 D
#237 Adel
County, IA
50 D
#238 Glenwood
County, IA
50 D
#239 Mediapolis
County, IA
50 D
#240 Mitchellville
County, IA
48 D
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.