A81/100
LAKE FOREST — Water Quality Report 2026
Serving 19,642 people · Illinois
Water Source
Surface Water
County
—
System ID
IL0970800
Violations
8
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.008 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2023 – February 28, 2024Rule: Ground Water 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 LAKE FOREST
Is LAKE FOREST water safe to drink?
LAKE FOREST water receives a grade of A (81/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has LAKE FOREST detected?
69 contaminants were tested in LAKE FOREST's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does LAKE FOREST have any EPA violations?
Yes, LAKE FOREST has 8 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, Other, TT. 2 are health-based violations.
How many people does LAKE FOREST serve?
LAKE FOREST serves approximately 19,642 people, Illinois. The system provides water to 1 community: Lake Forest.
What type of water does LAKE FOREST provide?
LAKE FOREST sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is IL0970800.
How does LAKE FOREST compare to other utilities in Illinois?
LAKE FOREST scores 81/100 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.