B62/100
GRAYSLAKE — Water Quality Report 2026
Serving 21,248 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0970250
Violations
11
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.010 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2006.
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 GRAYSLAKE
Is GRAYSLAKE water safe to drink?
GRAYSLAKE water receives a grade of B (62/100), which is considered good. 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 GRAYSLAKE detected?
69 contaminants were tested in GRAYSLAKE's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does GRAYSLAKE have any EPA violations?
Yes, GRAYSLAKE has 11 EPA violation(s) on record, with the most recent in 2006. Violation types include MR, MCL, TT. 6 are health-based violations.
How many people does GRAYSLAKE serve?
GRAYSLAKE serves approximately 21,248 people, Illinois. The system provides water to 1 community: Grays Lake.
What type of water does GRAYSLAKE provide?
GRAYSLAKE 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 IL0970250.
How does GRAYSLAKE compare to other utilities in Illinois?
GRAYSLAKE scores 62/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Illinois state page for a full comparison of water systems.