F0/100
COLCHESTER — Water Quality Report 2026
Serving 1,395 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL1090200
Violations
30
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2009.
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 COLCHESTER
Is COLCHESTER water safe to drink?
COLCHESTER water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 30 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has COLCHESTER detected?
4 contaminants were tested in COLCHESTER's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does COLCHESTER have any EPA violations?
Yes, COLCHESTER has 30 EPA violation(s) on record, with the most recent in 2009. Violation types include MR, TT, Other. 23 are health-based violations.
How many people does COLCHESTER serve?
COLCHESTER serves approximately 1,395 people, Illinois. The system provides water to 1 community: Colchester.
What type of water does COLCHESTER provide?
COLCHESTER sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is IL1090200.
How does COLCHESTER compare to other utilities in Illinois?
COLCHESTER scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Illinois state page for a full comparison of water systems.