C57/100
WINDSOR — Water Quality Report 2026
Serving 1,200 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL1730550
Violations
19
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.62 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
5
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: February 17, 2023 – July 3, 2023Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2023 – December 31, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2023 – December 31, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 2Resolved
Consumer confidence report — content deficiency
When: January 25, 2022 – April 22, 2022Rule: Ground Water RuleEnforcement: Formal — state order issued
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2021 – November 8, 2021Enforcement: Resolving — corrective action underway
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 WINDSOR
Is WINDSOR water safe to drink?
WINDSOR water receives a grade of C (57/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 19 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has WINDSOR detected?
2 contaminants were tested in WINDSOR's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does WINDSOR have any EPA violations?
Yes, WINDSOR has 19 EPA violation(s) on record, with the most recent in 2023. Violation types include Other, MR, TT. 4 are health-based violations.
How many people does WINDSOR serve?
WINDSOR serves approximately 1,200 people, Illinois. The system provides water to 1 community: Windsor.
What type of water does WINDSOR provide?
WINDSOR 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 IL1730550.
How does WINDSOR compare to other utilities in Illinois?
WINDSOR scores 57/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Illinois state page for a full comparison of water systems.