A86/100
Island Lake Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 8,066 residents · Illinois
What's In Island Lake's Tap Water?
32
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.96 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1997.
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
ISLAND LAKE
Population Served
8,066
Water Source
Groundwater
System ID
IL0974540
Frequently Asked Questions About Island Lake Water
Is Island Lake tap water safe to drink?
Island Lake, Illinois tap water receives a grade of A (86/100), which is considered excellent. Out of 32 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Island Lake's water?
Of the 32 contaminants tested in Island Lake's water supply, the most notable include Copper (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Island Lake have any water quality violations?
Yes, Island Lake has 2 EPA violation(s) on record, with the most recent in 1997. Violation types include MCL, MR. 1 of these are health-based violations, which are the most serious category.
Do I need a water filter in Island Lake?
Based on EPA data, using a water filter in Island Lake is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Island Lake's tap water come from?
Island Lake's drinking water is sourced from groundwater and supplied by ISLAND LAKE. The system serves approximately 8,066 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Island Lake'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. Island Lake'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 Island Lake's water compare to other cities in Illinois?
Island Lake's water quality score of 86/100 earns a grade of A, which is considered excellent. This places Island Lake among the better-performing water systems in Illinois. Visit our Illinois state page to see how all cities in the state compare.
What should I do if I'm concerned about Island Lake's water quality?
If you have concerns about Island Lake'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 (ISLAND LAKE) 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.