F0/100
Lake Zurich Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 19,759 residents · Illinois
What's In Lake Zurich's Tap Water?
66
Contaminants Tested
0
Exceed EPA Limits
2
Above EPA Goals
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
Water Utility Details
LAKE ZURICH
Population Served
19,759
Water Source
Groundwater
System ID
IL0970850
Frequently Asked Questions About Lake Zurich Water
Is Lake Zurich tap water safe to drink?
Lake Zurich, Illinois tap water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA maximum contaminant levels and 38 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Lake Zurich's water?
Of the 66 contaminants tested in Lake Zurich's water supply, the most notable include Lead (90th percentile), strontium. No contaminants exceed EPA legal limits. 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Lake Zurich have any water quality violations?
Yes, Lake Zurich has 38 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, MCL. 35 of these are health-based violations, which are the most serious category.
Do I need a water filter in Lake Zurich?
Lake Zurich water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 2 contaminant(s) exceed these stricter goals.
Where does Lake Zurich's tap water come from?
Lake Zurich's drinking water is sourced from groundwater and supplied by LAKE ZURICH. The system serves approximately 19,759 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Lake Zurich's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Lake Zurich's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Lake Zurich's water compare to other cities in Illinois?
Lake Zurich's water quality score of 0/100 earns a grade of F, which is considered failing. This is a concerning score that suggests significant water quality issues. Visit our Illinois state page to see how all cities in the state compare.
What should I do if I'm concerned about Lake Zurich's water quality?
If you have concerns about Lake Zurich's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (LAKE ZURICH) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.