D39/100
West Chicago Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 29,742 residents · Illinois
What's In West Chicago's Tap Water?
66
Contaminants Tested
0
Exceed EPA Limits
2
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 270.00 µg/L | — | Above Goal |
Lead (90th percentile) | < 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2005.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
STONE PARK
Population Served
4,576
Water Source
Purchased Surface Water
System ID
IL0313030
WEST CHICAGO
Population Served
25,166
Water Source
Groundwater
System ID
IL0430900
Frequently Asked Questions About West Chicago Water
Is West Chicago tap water safe to drink?
West Chicago, Illinois tap water receives a grade of D (39/100), which is considered poor. 0 contaminant(s) exceed EPA maximum contaminant levels and 37 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in West Chicago's water?
Of the 66 contaminants tested in West Chicago's water supply, the most notable include Lead (90th percentile), chlorate. No contaminants exceed EPA legal limits. 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does West Chicago have any water quality violations?
Yes, West Chicago has 37 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, Other, MR. 24 of these are health-based violations, which are the most serious category.
Do I need a water filter in West Chicago?
West Chicago water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 2 contaminant(s) exceed these stricter goals.
Where does West Chicago's tap water come from?
West Chicago's drinking water is sourced from purchased surface water and supplied by STONE PARK and 1 other water system(s). The system serves approximately 29,742 people. Surface water sources include rivers, lakes, and reservoirs.
How often is West Chicago's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. West Chicago's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does West Chicago's water compare to other cities in Illinois?
West Chicago's water quality score of 39/100 earns a grade of D, which is considered poor. This is a concerning score that suggests significant water quality issues. Visit our Illinois state page to see how all cities in the state compare.
What should I do if I'm concerned about West Chicago's water quality?
If you have concerns about West Chicago's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (STONE PARK) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.