D32/100
CHESTER — Water Quality Report 2026
Serving 8,407 people · Illinois
Water Source
Surface Water
County
—
System ID
IL1570100
Violations
37
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.004 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2013.
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
Frequently Asked Questions About CHESTER
Is CHESTER water safe to drink?
CHESTER water receives a grade of D (32/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 37 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CHESTER detected?
31 contaminants were tested in CHESTER's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CHESTER have any EPA violations?
Yes, CHESTER has 37 EPA violation(s) on record, with the most recent in 2013. Violation types include Other, TT, MR. 7 are health-based violations.
How many people does CHESTER serve?
CHESTER serves approximately 8,407 people, Illinois. The system provides water to 1 community: Chester.
What type of water does CHESTER provide?
CHESTER sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is IL1570100.
How does CHESTER compare to other utilities in Illinois?
CHESTER scores 32/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our Illinois state page for a full comparison of water systems.