A87/100
WILMETTE — Water Quality Report 2026
Serving 27,087 people · Illinois
Water Source
Surface Water
County
—
System ID
IL0313300
Violations
10
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.007 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Surface water treatment technique failure
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 WILMETTE
Is WILMETTE water safe to drink?
WILMETTE water receives a grade of A (87/100), 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 WILMETTE detected?
69 contaminants were tested in WILMETTE's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does WILMETTE have any EPA violations?
Yes, WILMETTE has 10 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR.
How many people does WILMETTE serve?
WILMETTE serves approximately 27,087 people, Illinois. The system provides water to 1 community: Wilmette.
What type of water does WILMETTE provide?
WILMETTE 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 IL0313300.
How does WILMETTE compare to other utilities in Illinois?
WILMETTE scores 87/100 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.