City Water Quality Rankings in Illinois
635 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#337
Fairbury
County, IL
73 C
#338 Farmer City
County, IL
73 C
#339 Princeton
County, IL
73 C
#340 Rantoul
County, IL
73 C
#341 River Grove
County, IL
73 C
#342 Rockton
County, IL
73 C
#343 Rolling Meadows
County, IL
73 C
#344 Schiller Park
County, IL
73 C
#345 Summit
County, IL
73 C
#346 Addison
County, IL
72 C
#347 Bannockburn
County, IL
72 C
#348 Carpentersville
County, IL
72 C
#349 Chester
County, IL
72 C
#350 Des Plaines
County, IL
72 C
#351 Elwood
County, IL
72 C
#352 Hampshire
County, IL
72 C
#353 Lake Forest
County, IL
72 C
#354 Lockport
County, IL
72 C
#355 Norris City
County, IL
72 C
#356 Pittsburg
County, IL
72 C
#357 Washington
County, IL
72 C
#358 West Dundee
County, IL
72 C
#359 Windsor
County, IL
72 C
#360 Woodlawn
County, IL
72 C
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.