City Water Quality Rankings in Illinois
631 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#73
Park City
County, IL
92 A
#74 Pawnee
County, IL
92 A
#75 Pecatonica
County, IL
92 A
#76 Roodhouse
County, IL
92 A
#77 Teutopolis
County, IL
92 A
#78 Valier
County, IL
92 A
#79 Waverly
County, IL
92 A
#80 Williamsville
County, IL
92 A
#81 Winnebago
County, IL
92 A
#82 Cherry Valley
County, IL
91 A
#83 Flanagan
County, IL
91 A
#84 Hamilton
County, IL
91 A
#85 Hanover Park
County, IL
91 A
#86 Homewood
County, IL
91 A
#87 Morrisonville
County, IL
91 A
#88 Alsip
County, IL
90 A
#89 Belle Rive
County, IL
90 A
#90 Blue Island
County, IL
90 A
#91 Carterville
County, IL
90 A
#92 Clayton
County, IL
90 A
#93 Elmhurst
County, IL
90 A
#94 Forsyth
County, IL
90 A
#95 Gibson City
County, IL
90 A
#96 Great Lakes
County, IL
90 A
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.