A90/100
Oakbrook Terrace Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 1,440 residents · Illinois
What's In Oakbrook Terrace's Tap Water?
2
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.57 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2020.
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
OAKBROOK TERRACE
Population Served
1,440
Water Source
Purchased Surface Water
System ID
IL0430750
Frequently Asked Questions About Oakbrook Terrace Water
Is Oakbrook Terrace tap water safe to drink?
Oakbrook Terrace, Illinois tap water receives a grade of A (90/100), which is considered excellent. Out of 2 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 Oakbrook Terrace's water?
Of the 2 contaminants tested in Oakbrook Terrace'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 Oakbrook Terrace have any water quality violations?
Yes, Oakbrook Terrace has 2 EPA violation(s) on record, with the most recent in 2020. Violation types include MR, Other. None of these are classified as health-based violations.
Do I need a water filter in Oakbrook Terrace?
Based on EPA data, using a water filter in Oakbrook Terrace 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 Oakbrook Terrace's tap water come from?
Oakbrook Terrace's drinking water is sourced from purchased surface water and supplied by OAKBROOK TERRACE. The system serves approximately 1,440 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Oakbrook Terrace'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. Oakbrook Terrace'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 Oakbrook Terrace's water compare to other cities in Illinois?
Oakbrook Terrace's water quality score of 90/100 earns a grade of A, which is considered excellent. This places Oakbrook Terrace 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 Oakbrook Terrace's water quality?
If you have concerns about Oakbrook Terrace'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 (OAKBROOK TERRACE) 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.