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Water Quality Report

Mosinee, WI

Marathon County · 4,572 residents · 3 water systems

10

Contaminants detected

4

PFAS compounds

Hardness (mg/L)

1

Above legal limits

3

Above health guidelines

Mosinee 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 Mosinee water.

Contaminants detected in Mosinee water

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

Lead0.0022 / 0.015 mg/L
15% of EPA limit
Nitrate0.59 / 10 mg/L
6% of EPA limit
Copper1.4 / 1.3 mg/L
108% of EPA limit
Radium0.94 / 5 pCi/L
19% of EPA limit
Uranium0.034 / 30 ug/L
0% of EPA limit
Total Trihalomethanes61.8 / 80 ug/L
77% of EPA limit
75% of EPA limit
Barium0.0057 / 2 mg/L
0% of EPA limit
Fluoride0.41 / 4 mg/L
10% of EPA limit
Orthophosphate2480 ug/L
Unregulated
PFAS (4 compounds detected)
Microplastics (not routinely tested)

Other cities in Marathon County

Water quality reports for nearby Wisconsin communities.

Frequently asked questions

Is Mosinee, WI tap water safe to drink?
Mosinee tap water has 1 contaminant currently measured above EPA legal standards (Maximum Contaminant Levels), and 3 above independent health guidelines. 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, how they compare to both legal limits and health guidelines, and what actions to take.
What contaminants are in Mosinee water?
Monitoring has detected 10 contaminants in Mosinee's water supply: Lead, Nitrate, Copper, Radium, Uranium, Total Trihalomethanes, Haloacetic Acids (HAA5), Barium, Fluoride, Orthophosphate. Additionally, 4 PFAS compounds have been detected at trace levels. 1 of these are above EPA legal limits. 3 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Mosinee water have PFAS?
Yes. 4 PFAS compounds have been detected in Mosinee'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.
Where does Mosinee get its drinking water?
Mosinee'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. Mosinee is served by 3 water systems, the largest being MOSINEE WATERWORKS (serving 3,406 people).

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