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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#121
Hoopeston
County, IL
88 B
#122
Thompsonville
County, IL
88 B
#123
Wheaton
County, IL
88 B
#124
Mt. Sterling
County, IL
87 B
#125
Arthur
County, IL
86 B
#126
Ava
County, IL
86 B
#127
Carlyle
County, IL
86 B
#128
Channahon
County, IL
86 B
#129
El Paso
County, IL
86 B
#130
Forrest
County, IL
86 B
#131
Grayslake
County, IL
86 B
#132
Hanna City
County, IL
86 B
#133
Hinckley
County, IL
86 B
#134
Homer
County, IL
86 B
#135
Hopkins Park
County, IL
86 B
#136
Naperville
County, IL
86 B
#137
Nokomis
County, IL
86 B
#138
Park Forest
County, IL
86 B
#139
Paxton
County, IL
86 B
#140
Pierron
County, IL
86 B
#141
Pocahontas
County, IL
86 B
#142
Quincy
County, IL
86 B
#143
Shelbyville
County, IL
86 B
#144
Sleepy Hollow
County, IL
86 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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