City Water Quality Rankings in Illinois
635 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#193
Spring Valley
County, IL
84 B
#194 Stillman Valley
County, IL
84 B
#195 Thompsonville
County, IL
84 B
#196 Villa Park
County, IL
84 B
#197 Westmont
County, IL
84 B
#198 Wheeling
County, IL
84 B
#199 Wood River
County, IL
84 B
#200 Catlin
County, IL
83 B
#201 Flora
County, IL
83 B
#202 Flossmoor
County, IL
83 B
#203 Hebron
County, IL
83 B
#204 Ingleside
County, IL
83 B
#205 Kankakee
County, IL
83 B
#206 Palos Park
County, IL
83 B
#207 Sandwich
County, IL
83 B
#208 South Holland
County, IL
83 B
#209 Stickney
County, IL
83 B
#210 Braidwood
County, IL
82 B
#211 Byron
County, IL
82 B
#212 Chatsworth
County, IL
82 B
#213 Depue
County, IL
82 B
#214 Hamel
County, IL
82 B
#215 Lemont
County, IL
82 B
#216 Lewistown
County, IL
82 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.