A81/100
Oak Park Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 54,583 residents · Illinois
What's In Oak Park's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.005 mg/L | 0.015 mg/L | Above Goal |
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
OAK PARK
Population Served
54,583
Water Source
Purchased Surface Water
System ID
IL0312250
Frequently Asked Questions About Oak Park Water
Is Oak Park tap water safe to drink?
Oak Park, Illinois tap water receives a grade of A (81/100), which is considered excellent. Out of 69 contaminants tested, none 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 Oak Park's water?
Of the 69 contaminants tested in Oak Park's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Oak Park have any water quality violations?
Yes, Oak Park has 8 EPA violation(s) on record, with the most recent in 1997. Violation types include MR, TT. 2 of these are health-based violations, which are the most serious category.
Do I need a water filter in Oak Park?
Oak Park 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. 1 contaminant(s) exceed these stricter goals.
Where does Oak Park's tap water come from?
Oak Park's drinking water is sourced from purchased surface water and supplied by OAK PARK. The system serves approximately 54,583 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Oak Park'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. Oak Park'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 Oak Park's water compare to other cities in Illinois?
Oak Park's water quality score of 81/100 earns a grade of A, which is considered excellent. This places Oak Park 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 Oak Park's water quality?
If you have concerns about Oak Park'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 (OAK PARK) 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.