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Water Quality Report

Darien, IL

35,146 residents · 7 water systems

0

Contaminants detected

0

PFAS compounds

—

Hardness (mg/L)

0

Above legal limits

2

Above health guidelines

Darien drinking water comes from a mix of groundwater and surface water sources. Based on the most recent monitoring data, 0 contaminants have been detected in the water supply. PFAS testing has been conducted with no detections.

Limited monitoring data available

The water systems serving Darien are small private systems (population served: 35,146) and are not part of Illinois EPA's main contaminant monitoring program. No detected contaminant data is available for these systems.

If you're researching the main municipal utility serving Darien, search for your specific address below — the search returns the actual water system serving your residence, which may be different from what's listed here.

Water systems serving Darien

DARIEN

21,751 servedSurface water0 contaminants1 above guideline
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SOUTHEAST REGIONAL WATER FACILITY

6,940 servedSurface water0 contaminants
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GLEN ELLYN HEIGHTS SUBDIVISION

1,931 servedSurface water0 contaminants
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STEEPLE RUN SBDV

1,931 servedSurface water0 contaminants1 above guideline
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YORK TOWNSHIP WATER SYSTEM

1,423 servedSurface water0 contaminants
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NORTH REGIONAL WATER FAC

770 servedGroundwater0 contaminants
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HOBSON VALLEY WATER SYSTEM

400 servedSurface water0 contaminants
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Frequently asked questions

Is Darien, IL tap water safe to drink?
Darien 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. 0 contaminants have been detected in the water supply, including . 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 Darien water?
Monitoring has detected 0 contaminants in Darien's water supply: . 2 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Darien water have PFAS?
Darien'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 Darien get its drinking water?
Darien's drinking water comes from a combination of groundwater and surface water sources. The water is treated and tested according to Illinois EPA and EPA requirements before distribution. Darien is served by 7 water systems, the largest being DARIEN (serving 21,751 people).

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