What's in WEST CHICAGO's water?
WEST CHICAGO has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 25,166 people get their water from it, across 6,869 connections.
Ranked against every other system in this dataset
WEST CHICAGO has 27 violations on record in total, 22 of thems health-based - ranking it 826th of 12,903 systems by violation count, the 94th percentile nationally.
Against the IL average
Among the 560 IL systems in this dataset, the average is 5.0 health-based violations - WEST CHICAGO's 22 is above that. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
WEST CHICAGO's most recent violation on record is dated 2005-08-04, with the most recent health-based one dated 2005-01-10. Last reported to EPA: 05/27/2026.
The concern categories on record
WEST CHICAGO's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Radionuclides - flagged from: Combined Radium (-226 and -228); Gross Alpha, Excl. Radon and U
The most severe category on record is radionuclides, which points toward a reverse osmosis-class filter if you want to address it directly.
What WEST CHICAGO's record does not cover
Everything on this page is WEST CHICAGO's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. This record - 22 health-based violations on file for WEST CHICAGO - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.