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Water Quality Report

Clarendon Hills, IL

DuPage County · 8,702 residents · 1 water system

9

Contaminants detected

0

PFAS compounds

682

Hardness (mg/L)

0

Above legal limits

2

Above health guidelines

Clarendon Hills drinking water comes from surface water. Based on the most recent monitoring data, 9 contaminants have been detected in the water supply, including Lead, Arsenic, Copper, Total Trihalomethanes, and 5 others. PFAS testing has been conducted with no detections. Water hardness is 682 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.

Contaminants detected in Clarendon Hills water

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

Lead0.0053 / 0.015 mg/L
35% of EPA limit
Arsenic0.0016 / 0.01 mg/L
16% of EPA limit
Copper5 / 1300 ug/L
0% of EPA limit
Total Trihalomethanes41.9 / 80 ug/L
52% of EPA limit
51% of EPA limit
Barium0.0253 / 2 mg/L
1% of EPA limit
Fluoride0.27 / 4 mg/L
7% of EPA limit
Diquat0.4 / 20 ug/L
2% of EPA limit
Orthophosphate2320 ug/L
Unregulated
PFAS (tested — none detected)
Microplastics (not routinely tested)

Other cities in DuPage County

Water quality reports for nearby Illinois communities.

Frequently asked questions

Is Clarendon Hills, IL tap water safe to drink?
Clarendon Hills tap water meets EPA legal standards (Maximum Contaminant Levels). However, 2 contaminants are present above independent health guidelines, which are often stricter than legal limits. 9 contaminants have been detected in the water supply, including Lead, Arsenic, 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 Clarendon Hills water?
Monitoring has detected 9 contaminants in Clarendon Hills's water supply: Lead, Arsenic, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5), Barium, Fluoride, Diquat, Orthophosphate. 2 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Clarendon Hills water have PFAS?
Clarendon Hills'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.
Is Clarendon Hills water hard?
Yes. Clarendon Hills water has a hardness of 682 mg/L (very hard). Hard water is not a health concern but can cause scale buildup in water heaters and appliances, reduce soap effectiveness, and leave mineral deposits. Water softeners or conditioning systems can address hardness.
Where does Clarendon Hills get its drinking water?
Clarendon Hills's drinking water comes from surface water sources. The water is treated and tested according to Illinois EPA and EPA requirements before distribution. Clarendon Hills is served by one water system: CLARENDON HILLS.

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