A86/100
ISLAND LAKE — Water Quality Report 2026
Serving 8,066 people · Illinois
Water Source
Groundwater
County
—
System ID
IL0974540
Violations
2
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.96 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1997.
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 ISLAND LAKE
Is ISLAND LAKE water safe to drink?
ISLAND LAKE water receives a grade of A (86/100), which is considered excellent. Out of 32 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has ISLAND LAKE detected?
32 contaminants were tested in ISLAND LAKE's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does ISLAND LAKE have any EPA violations?
Yes, ISLAND LAKE has 2 EPA violation(s) on record, with the most recent in 1997. Violation types include MCL, MR. 1 are health-based violations.
How many people does ISLAND LAKE serve?
ISLAND LAKE serves approximately 8,066 people, Illinois. The system provides water to 1 community: Island Lake.
What type of water does ISLAND LAKE provide?
ISLAND LAKE sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL0974540.
How does ISLAND LAKE compare to other utilities in Illinois?
ISLAND LAKE scores 86/100 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.