F1/100
WONDER LAKE (NIU) — Water Quality Report 2026
Serving 1,950 people · Illinois
Water Source
Groundwater
County
—
System ID
IL1115850
Violations
83
Contaminant Test Results
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: November 1, 2024 – November 30, 2024Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: November 1, 2024 – November 30, 2024Rule: Total Coliform RuleEnforcement: 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 WONDER LAKE (NIU)
Is WONDER LAKE (NIU) water safe to drink?
WONDER LAKE (NIU) water receives a grade of F (1/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 83 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has WONDER LAKE (NIU) detected?
1 contaminants were tested in WONDER LAKE (NIU)'s water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does WONDER LAKE (NIU) have any EPA violations?
Yes, WONDER LAKE (NIU) has 83 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, MON, MCL. 4 are health-based violations.
How many people does WONDER LAKE (NIU) serve?
WONDER LAKE (NIU) serves approximately 1,950 people, Illinois.
What type of water does WONDER LAKE (NIU) provide?
WONDER LAKE (NIU) sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1115850.
How does WONDER LAKE (NIU) compare to other utilities in Illinois?
WONDER LAKE (NIU) scores 1/100 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.