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Water Quality Report

Sun Prairie, WI

Dane County · 34,071 residents · 3 water systems

17

Contaminants detected

5

PFAS compounds

370

Hardness (mg/L)

0

Above legal limits

5

Above health guidelines

Sun Prairie drinking water comes from groundwater wells. Based on the most recent monitoring data, 17 contaminants have been detected in the water supply, including Lead, Nitrate, Arsenic, Copper, and 13 others. PFAS compounds have been detected at trace levels in Sun Prairie water. Water hardness is 370 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.

Contaminants detected in Sun Prairie water

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

Lead0.0028 / 0.015 mg/L
19% of EPA limit
Nitrate5.2 / 10 mg/L
52% of EPA limit
Arsenic0.0013 / 0.01 mg/L
13% of EPA limit
Copper140 / 1300 ug/L
11% of EPA limit
Radon137 pCi/L
UnregulatedRadionuclide
Radium1.7 / 5 pCi/L
33% of EPA limit
Uranium0.723 / 30 ug/L
2% of EPA limit
Gross Alpha Radiation3 / 15 pCi/L
20% of EPA limit
Tetrachloroethylene1.1 / 5 ug/L
22% of EPA limit
Total Trihalomethanes2.8 / 80 ug/L
4% of EPA limit
Haloacetic Acids (HAA5)0.78 / 60 ug/L
1% of EPA limit
Atrazine0.017 / 3 ug/L
1% of EPA limit
Nickel0.0026 mg/L
UnregulatedInorganic
Selenium0.0046 / 0.05 mg/L
9% of EPA limit
Xylenes0.87 / 10000 ug/L
0% of EPA limit
Fluoride0.662 / 4 mg/L
17% of EPA limit
Barium0.036 / 2 mg/L
2% of EPA limit
PFAS (5 compounds detected)
Microplastics (not routinely tested)

Water systems serving Sun Prairie

SUN PRAIRIE UTILITIES

33,966 servedGroundwater17 contaminants4 above guidelines
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EAST BRISTOL UTILITY COOP

80 servedGroundwater0 contaminants1 above guideline
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PIRATES COVE MOBILE HOME COMMUNITY

25 servedGroundwater0 contaminants
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Other cities in Dane County

Water quality reports for nearby Wisconsin communities.

Black EarthBlue MoundsCambridgeCottage GroveCross PlainsDaneDeerfieldDeforestFitchburgMadisonMarshallMazomanie

Frequently asked questions

Is Sun Prairie, WI tap water safe to drink?
Sun Prairie tap water meets EPA legal standards (Maximum Contaminant Levels). However, 5 contaminants are present above independent health guidelines, which are often stricter than legal limits. 17 contaminants have been detected in the water supply, including Lead, Nitrate, Arsenic, Copper, Radon. 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 Sun Prairie water?
Monitoring has detected 17 contaminants in Sun Prairie's water supply: Lead, Nitrate, Arsenic, Copper, Radon, Radium, Uranium, Gross Alpha Radiation, Tetrachloroethylene, Total Trihalomethanes, Haloacetic Acids (HAA5), Atrazine, Nickel, Selenium, Xylenes, Fluoride, Barium. Additionally, 5 PFAS compounds have been detected at trace levels. 5 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Sun Prairie water have PFAS?
Yes. 5 PFAS compounds have been detected in Sun Prairie's water supply at trace levels. PFAS are sometimes called "forever chemicals" because they do not break down in the environment. The EPA has set Maximum Contaminant Levels for several PFAS compounds. View the detailed report for specific concentrations.
Is Sun Prairie water hard?
Yes. Sun Prairie water has a hardness of 370 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 Sun Prairie get its drinking water?
Sun Prairie'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. Sun Prairie is served by 3 water systems, the largest being SUN PRAIRIE UTILITIES (serving 33,966 people).

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