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Water Quality Report

Hudson, WI

St Croix County · 18,708 residents · 2 water systems

20

Contaminants detected

7

PFAS compounds

290

Hardness (mg/L)

0

Above legal limits

6

Above health guidelines

Hudson drinking water comes from groundwater wells. Based on the most recent monitoring data, 20 contaminants have been detected in the water supply, including Lead, Nitrate, Arsenic, Copper, and 16 others. PFAS compounds have been detected at trace levels in Hudson water. Water hardness is 290 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.

Contaminants detected in Hudson water

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

Lead0.0061 / 0.015 mg/L
41% of EPA limit
Nitrate3.9 / 10 mg/L
39% of EPA limit
Arsenic0.0022 / 0.01 mg/L
22% of EPA limit
Copper60 / 1300 ug/L
5% of EPA limit
Radium3.9 / 5 pCi/L
79% of EPA limit
Uranium12.4 / 30 ug/L
41% of EPA limit
Gross Alpha Radiation3.1 / 15 pCi/L
21% of EPA limit
Total Trihalomethanes4.9 / 80 ug/L
6% of EPA limit
Haloacetic Acids (HAA5)1.6 / 60 ug/L
3% of EPA limit
Atrazine0.022 / 3 ug/L
1% of EPA limit
Nickel0.028 mg/L
UnregulatedInorganic
Selenium0.0065 / 0.05 mg/L
13% of EPA limit
Xylenes1.4 / 10000 ug/L
0% of EPA limit
Fluoride0.72 / 4 mg/L
18% of EPA limit
Antimony0.00025 / 0.006 mg/L
4% of EPA limit
Toluene0.39 / 1000 ug/L
0% of EPA limit
Ethylbenzene0.34 / 700 ug/L
0% of EPA limit
Barium0.024 / 2 mg/L
1% of EPA limit
PFBA (Perfluorobutanoic Acid)0.007 ug/L
UnregulatedPFAS
Lithium16 ug/L
Unregulated
PFAS (7 compounds detected)
Microplastics (not routinely tested)

Water systems serving Hudson

HUDSON WATERWORKS

18,558 servedGroundwater20 contaminants4 above guidelines
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COUNTRY COVE COURT LLC

150 servedGroundwater7 contaminants2 above guidelines
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Other cities in St Croix County

Water quality reports for nearby Wisconsin communities.

AdellCascadeCedar GroveElkhart LakeGlenbeulahKohlerOostburgRandom LakeSheboygan FallsWaldo

Frequently asked questions

Is Hudson, WI tap water safe to drink?
Hudson tap water meets EPA legal standards (Maximum Contaminant Levels). However, 6 contaminants are present above independent health guidelines, which are often stricter than legal limits. 20 contaminants have been detected in the water supply, including Lead, Nitrate, Arsenic, Copper, Radium. 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 Hudson water?
Monitoring has detected 20 contaminants in Hudson's water supply: Lead, Nitrate, Arsenic, Copper, Radium, Uranium, Gross Alpha Radiation, Total Trihalomethanes, Haloacetic Acids (HAA5), Atrazine, Nickel, Selenium, Xylenes, Fluoride, Antimony, Toluene, Ethylbenzene, Barium, PFBA (Perfluorobutanoic Acid), Lithium. Additionally, 7 PFAS compounds have been detected at trace levels. 6 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Hudson water have PFAS?
Yes. 7 PFAS compounds have been detected in Hudson'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 Hudson water hard?
Yes. Hudson water has a hardness of 290 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 Hudson get its drinking water?
Hudson'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. Hudson is served by 2 water systems, the largest being HUDSON WATERWORKS (serving 18,558 people).

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