City Water Quality Rankings in Illinois
631 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#217
Desoto
County, IL
80 B
#218 East Alton
County, IL
80 B
#219 East Dubuque
County, IL
80 B
#220 Glencoe
County, IL
80 B
#221 Hillside
County, IL
80 B
#222 Lacon
County, IL
80 B
#223 Lagrange Park
County, IL
80 B
#224 Lewistown
County, IL
80 B
#225 Louisville
County, IL
80 B
#226 Olympia Fields
County, IL
80 B
#227 Riverton
County, IL
80 B
#228 Rossville
County, IL
80 B
#229 Toledo
County, IL
80 B
#230 Trenton
County, IL
80 B
#231 Westville
County, IL
80 B
#232 Albion
County, IL
79 B
#233 Amboy
County, IL
79 B
#234 Genoa
County, IL
79 B
#235 Lincoln
County, IL
79 B
#236 Northfield
County, IL
79 B
#237 Shawneetown
County, IL
79 B
#238 Watseka
County, IL
79 B
#239 West Chicago
County, IL
79 B
#240 Willowbrook
County, IL
79 B
Frequently Asked Questions
How are city water quality rankings calculated in Illinois?
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 Illinois?
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.