A90/100
WEST PRAIRIE WATER CO-OP — Water Quality Report 2026
Serving 2,395 people · Illinois
Water Source
Purchased Groundwater
County
—
System ID
IL1090030
Violations
2
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.33 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
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: October 1, 2021 – September 30, 2022Rule: 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: October 1, 2021 – September 30, 2022Rule: Stage 2 DBPREnforcement: 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 WEST PRAIRIE WATER CO-OP
Is WEST PRAIRIE WATER CO-OP water safe to drink?
WEST PRAIRIE WATER CO-OP water receives a grade of A (90/100), which is considered excellent. Out of 2 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has WEST PRAIRIE WATER CO-OP detected?
2 contaminants were tested in WEST PRAIRIE WATER CO-OP's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does WEST PRAIRIE WATER CO-OP have any EPA violations?
Yes, WEST PRAIRIE WATER CO-OP has 2 EPA violation(s) on record, with the most recent in 2021. Violation types include MR.
How many people does WEST PRAIRIE WATER CO-OP serve?
WEST PRAIRIE WATER CO-OP serves approximately 2,395 people, Illinois. The system provides water to 1 community: Colchester.
What type of water does WEST PRAIRIE WATER CO-OP provide?
WEST PRAIRIE WATER CO-OP sources its water from purchased groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1090030.
How does WEST PRAIRIE WATER CO-OP compare to other utilities in Illinois?
WEST PRAIRIE WATER CO-OP scores 90/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Illinois state page for a full comparison of water systems.