WaterQ

City Water Quality Rankings in Illinois

635 cities ranked by drinking water quality.

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Popular city water quality comparisons

Alto Pass, IL vs Aurora, IL Compare → Beach Park, IL vs Cahokia Heights, IL Compare → Chatham, IL vs Davis Junction, IL Compare → Evanston, IL vs Forrest, IL Compare →

Trending Cities

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#553
North Chicago
County, IL
42 F
#554
Oswego
County, IL
42 F
#555
Brookfield
County, IL
40 F
#556
Jerseyville
County, IL
40 F
#557
Oregon
County, IL
40 F
#558
Barrington
County, IL
38 F
#559
Pana
County, IL
38 F
#560
Prophetstown
County, IL
38 F
#561
Vienna
County, IL
38 F
#562
Benton
County, IL
37 F
#563
Tuscola
County, IL
37 F
#564
White Hall
County, IL
37 F
#565
Buffalo
County, IL
36 F
#566
Erie
County, IL
36 F
#567
Monee
County, IL
36 F
#568
New Burnside
County, IL
36 F
#569
Polo
County, IL
36 F
#570
Chillicothe
County, IL
35 F
#571
Round Lake Park
County, IL
35 F
#572
Vandalia
County, IL
35 F
#573
Illiopolis
County, IL
34 F
#574
Makanda
County, IL
34 F
#575
Peoria Heights
County, IL
34 F
#576
Peru
County, IL
34 F

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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