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Water Quality Report

Baldwin, WI

Sauk County · 4,440 residents · 1 water system

10

Contaminants detected

1

PFAS compounds

200

Hardness (mg/L)

0

Above legal limits

2

Above health guidelines

Baldwin drinking water comes from groundwater wells. Based on the most recent monitoring data, 10 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Radium, and 6 others. PFAS compounds have been detected at trace levels in Baldwin water. Water hardness is 200 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.

Contaminants detected in Baldwin water

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

Lead0.001 / 0.015 mg/L
7% of EPA limit
Nitrate2.8 / 10 mg/L
28% of EPA limit
Copper61 / 1300 ug/L
5% of EPA limit
Radium0.595 / 5 pCi/L
12% of EPA limit
Uranium0.624 / 30 ug/L
2% of EPA limit
Gross Alpha Radiation1.4 / 15 pCi/L
9% of EPA limit
Atrazine0.017 / 3 ug/L
1% of EPA limit
Selenium0.001 / 0.05 mg/L
2% of EPA limit
Fluoride0.11 / 4 mg/L
3% of EPA limit
Barium0.0049 / 2 mg/L
0% of EPA limit
PFAS (1 compounds detected)
Microplastics (not routinely tested)

Other cities in Sauk County

Water quality reports for nearby Wisconsin communities.

Frequently asked questions

Is Baldwin, WI tap water safe to drink?
Baldwin 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. 10 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 Baldwin water?
Monitoring has detected 10 contaminants in Baldwin's water supply: Lead, Nitrate, Copper, Radium, Uranium, Gross Alpha Radiation, Atrazine, Selenium, Fluoride, Barium. Additionally, 1 PFAS compounds have been detected at trace levels. 2 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Baldwin water have PFAS?
Yes. 1 PFAS compounds have been detected in Baldwin'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 Baldwin water hard?
Yes. Baldwin water has a hardness of 200 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 Baldwin get its drinking water?
Baldwin'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. Baldwin is served by one water system: BALDWIN WATERWORKS.

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