City Water Quality Rankings in Illinois
635 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#97
Waverly
County, IL
92 A
#98 Williamsville
County, IL
92 A
#99 Winnebago
County, IL
92 A
#100 Flanagan
County, IL
91 A
#101 Lakemoor
County, IL
91 A
#102 Morrison
County, IL
91 A
#103 Park City
County, IL
91 A
#104 Alsip
County, IL
90 A
#105 Atlanta
County, IL
90 A
#106 Belle Rive
County, IL
90 A
#107 Blue Island
County, IL
90 A
#108 Carterville
County, IL
90 A
#109 Elmhurst
County, IL
90 A
#110 Gibson City
County, IL
90 A
#111 Great Lakes
County, IL
90 A
#112 Greenup
County, IL
90 A
#113 Hartford
County, IL
90 A
#114 Lanark
County, IL
90 A
#115 Momence
County, IL
90 A
#116 Mt Vernon
County, IL
90 A
#117 Mt. Sterling
County, IL
90 A
#118 Paxton
County, IL
90 A
#119 Petersburg
County, IL
90 A
#120 Pleasant Plains
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.