City Water Quality Rankings in Illinois
635 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#169
Lisle
County, IL
85 B
#170 Loves Park
County, IL
85 B
#171 Martinsville
County, IL
85 B
#172 Neoga
County, IL
85 B
#173 Niles
County, IL
85 B
#174 Olympia Fields
County, IL
85 B
#175 Riverdale
County, IL
85 B
#176 Robinson
County, IL
85 B
#177 Albion
County, IL
84 B
#178 Amboy
County, IL
84 B
#179 Beecher
County, IL
84 B
#180 Carlyle
County, IL
84 B
#181 Chicago Ridge
County, IL
84 B
#182 Downers Grove
County, IL
84 B
#183 Dunlap
County, IL
84 B
#184 East Carondelet
County, IL
84 B
#185 Hinsdale
County, IL
84 B
#186 Machesney Park
County, IL
84 B
#187 Mundelein
County, IL
84 B
#188 North Riverside
County, IL
84 B
#189 Palos Hills
County, IL
84 B
#190 Princeville
County, IL
84 B
#191 Riverton
County, IL
84 B
#192 Smithton
County, IL
84 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.