Water Quality Report
Darien, WI
Walworth County · 1,573 residents · 1 water system
11
Contaminants detected
0
PFAS compounds
—
Hardness (mg/L)
0
Above legal limits
1
Above health guidelines
Darien drinking water comes from groundwater wells. Based on the most recent monitoring data, 11 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Radium, and 7 others.
Contaminants detected in Darien water
Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.
Lead0.00089 / 0.015 mg/L
6% of EPA limit
Nitrate0.074 / 10 mg/L
1% of EPA limit
Copper120 / 1300 ug/L
9% of EPA limit
Radium2.4 / 5 pCi/L
48% of EPA limit
Uranium0.076 / 30 ug/L
0% of EPA limit
Total Trihalomethanes55.3 / 80 ug/L
69% of EPA limit
Haloacetic Acids (HAA5)22.7 / 60 ug/L
38% of EPA limit
Nickel0.0013 mg/L
UnregulatedInorganic
Nitrite0.071 / 1 mg/L
7% of EPA limit
Fluoride0.24 / 4 mg/L
6% of EPA limit
Barium0.38 / 2 mg/L
19% of EPA limit
Microplastics (not routinely tested)
Water systems serving Darien
Other cities in Walworth County
Water quality reports for nearby Wisconsin communities.
Frequently asked questions
Is Darien, WI tap water safe to drink?
Darien 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. 11 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Radium, Uranium. 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 11 contaminants in Darien's water supply: Lead, Nitrate, Copper, Radium, Uranium, Total Trihalomethanes, Haloacetic Acids (HAA5), Nickel, Nitrite, Fluoride, Barium. 1 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Where does Darien get its drinking water?
Darien's drinking water comes from groundwater wells that draw from underground aquifers. The water is treated and tested according to Wisconsin DNR and EPA requirements before distribution. Darien is served by one water system: DARIEN WATERWORKS.
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