City Water Quality Rankings in Illinois
631 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#409
Peoria
County, IL
62 C
#410 Scott Air Force Base
County, IL
62 C
#411 Stockton
County, IL
62 C
#412 Arcola
County, IL
61 C
#413 Barry
County, IL
61 C
#414 Carpentersville
County, IL
61 C
#415 Charleston
County, IL
61 C
#416 Germantown
County, IL
61 C
#417 Kingston
County, IL
61 C
#418 Lake Bluff
County, IL
61 C
#419 Mascoutah
County, IL
61 C
#420 Merrionette Park
County, IL
61 C
#421 Atwood
County, IL
60 C
#422 Batavia
County, IL
60 C
#423 Country Club Hills
County, IL
60 C
#424 Diamond
County, IL
60 C
#425 Green Oaks
County, IL
60 C
#426 Gurnee
County, IL
60 C
#427 Hillsboro
County, IL
60 C
#428 Lexington
County, IL
60 C
#429 Oak Park
County, IL
60 C
#430 Poplar Grove
County, IL
60 C
#431 Bement
County, IL
59 D
#432 Princeton
County, IL
59 D
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.