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Water Quality Report

Oak Park, IL

Cook County · 54,583 residents · 1 water system

4

Contaminants detected

0

PFAS compounds

—

Hardness (mg/L)

0

Above legal limits

1

Above health guidelines

Oak Park drinking water comes from surface water. Based on the most recent monitoring data, 4 contaminants have been detected in the water supply, including Lead, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5). PFAS testing has been conducted with no detections.

Contaminants detected in Oak Park water

Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.

Lead0.0045 / 0.015 mg/L
30% of EPA limit
Copper254 / 1300 ug/L
20% of EPA limit
38% of EPA limit
22% of EPA limit
PFAS (tested — none detected)
Microplastics (not routinely tested)

Other cities in Cook County

Water quality reports for nearby Illinois communities.

Frequently asked questions

Is Oak Park, IL tap water safe to drink?
Oak Park tap water meets EPA legal standards (Maximum Contaminant Levels). However, 1 contaminant is present above independent health guidelines, which are often stricter than legal limits. 4 contaminants have been detected in the water supply, including Lead, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5). View the detailed report for each water system to see specific levels and how they compare to both legal limits and health guidelines.
What contaminants are in Oak Park water?
Monitoring has detected 4 contaminants in Oak Park's water supply: Lead, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5). 1 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Oak Park water have PFAS?
Oak Park's water has been tested for PFAS compounds with no detections. Testing was conducted as part of the EPA's Unregulated Contaminant Monitoring Rule (UCMR5) program.
Where does Oak Park get its drinking water?
Oak Park's drinking water comes from surface water sources. The water is treated and tested according to Illinois EPA and EPA requirements before distribution. Oak Park is served by one water system: OAK PARK.

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