City Water Quality Rankings in Illinois
631 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#241
Windsor
County, IL
79 B
#242 Wood Dale
County, IL
79 B
#243 Athens
County, IL
78 B
#244 Cambridge
County, IL
78 B
#245 Canton
County, IL
78 B
#246 Hebron
County, IL
78 B
#247 Mahomet
County, IL
78 B
#248 Metamora
County, IL
78 B
#249 Modesto
County, IL
78 B
#250 Morton
County, IL
78 B
#251 Mulkeytown
County, IL
78 B
#252 Oglesby
County, IL
78 B
#253 Pittsfield
County, IL
78 B
#254 Wasco
County, IL
78 B
#255 Bloomingdale
County, IL
77 B
#256 Garden Homes
County, IL
77 B
#257 Lebanon
County, IL
77 B
#258 Marine
County, IL
77 B
#259 Metropolis
County, IL
77 B
#260 North Lake
County, IL
77 B
#261 Northbrook
County, IL
77 B
#262 River Forest
County, IL
77 B
#263 Sandwich
County, IL
77 B
#264 Auburn
County, IL
76 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.