F0/100
LAKE ZURICH — Water Quality Report 2026
Serving 19,759 people · Illinois
Water Source
Groundwater
County
—
System ID
IL0970850
Violations
38
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
strontium | 1656.90 µg/L | — | Above Goal |
Lead (90th percentile) | 0.010 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Exceeded the MCL for disinfection byproducts
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2023 – December 31, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved
Exceeded the MCL for disinfection byproducts
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2023 – December 31, 2023Enforcement: 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 ZURICH
Is LAKE ZURICH water safe to drink?
LAKE ZURICH water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 38 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has LAKE ZURICH detected?
66 contaminants were tested in LAKE ZURICH's water. Notable contaminants include Lead (90th percentile), strontium. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does LAKE ZURICH have any EPA violations?
Yes, LAKE ZURICH has 38 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, MCL. 35 are health-based violations.
How many people does LAKE ZURICH serve?
LAKE ZURICH serves approximately 19,759 people, Illinois. The system provides water to 1 community: Lake Zurich.
What type of water does LAKE ZURICH provide?
LAKE ZURICH sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL0970850.
How does LAKE ZURICH compare to other utilities in Illinois?
LAKE ZURICH scores 0/100 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.