WaterQ

City Water Quality Rankings in Illinois

631 cities ranked by drinking water quality.

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Popular city water quality comparisons

Alto Pass, IL vs Beach Park, IL Compare → Cahokia Heights, IL vs Chatham, IL Compare → Davis Junction, IL vs Evanston, IL Compare → Freeport, IL vs Groveland, IL Compare →

Trending Cities

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#169
Marengo
County, IL
84 B
#170
Mundelein
County, IL
84 B
#171
North Riverside
County, IL
84 B
#172
Palos Hills
County, IL
84 B
#173
Princeville
County, IL
84 B
#174
Robinson
County, IL
84 B
#175
Smithton
County, IL
84 B
#176
Spring Valley
County, IL
84 B
#177
Stillman Valley
County, IL
84 B
#178
Villa Park
County, IL
84 B
#179
Walnut
County, IL
84 B
#180
Westmont
County, IL
84 B
#181
Wheeling
County, IL
84 B
#182
Wood River
County, IL
84 B
#183
Catlin
County, IL
83 B
#184
Flora
County, IL
83 B
#185
Flossmoor
County, IL
83 B
#186
Frankfort
County, IL
83 B
#187
Freeburg
County, IL
83 B
#188
Geneva
County, IL
83 B
#189
Glasford
County, IL
83 B
#190
Lombard
County, IL
83 B
#191
Palos Park
County, IL
83 B
#192
Stickney
County, IL
83 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.

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