A80/100
VERNON HILLS - LAKE CO PW — Water Quality Report 2026
Serving 33,207 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0971750
Violations
8
Contaminant Test Results
EPA Violation History
1
Violation (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: July 1, 2024 – September 30, 2024Rule: 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 VERNON HILLS - LAKE CO PW
Is VERNON HILLS - LAKE CO PW water safe to drink?
VERNON HILLS - LAKE CO PW water receives a grade of A (80/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has VERNON HILLS - LAKE CO PW detected?
69 contaminants were tested in VERNON HILLS - LAKE CO PW's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does VERNON HILLS - LAKE CO PW have any EPA violations?
Yes, VERNON HILLS - LAKE CO PW has 8 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, Other, MCL. 3 are health-based violations.
How many people does VERNON HILLS - LAKE CO PW serve?
VERNON HILLS - LAKE CO PW serves approximately 33,207 people, Illinois. The system provides water to 1 community: Vernon Hills.
What type of water does VERNON HILLS - LAKE CO PW provide?
VERNON HILLS - LAKE CO PW 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 IL0971750.
How does VERNON HILLS - LAKE CO PW compare to other utilities in Illinois?
VERNON HILLS - LAKE CO PW scores 80/100 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.