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Water Quality Report

Osseo, WI

Trempealeau County · 1,701 residents · 1 water system

14

Contaminants detected

5

PFAS compounds

162

Hardness (mg/L)

0

Above legal limits

3

Above health guidelines

Osseo drinking water comes from groundwater wells. Based on the most recent monitoring data, 14 contaminants have been detected in the water supply, including Lead, Nitrate, Arsenic, Copper, and 10 others. PFAS compounds have been detected at trace levels in Osseo water. Water hardness is 162 mg/L (hard), which is within a typical range for the region.

Contaminants detected in Osseo water

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

Lead0.0012 / 0.015 mg/L
8% of EPA limit
Nitrate1.4 / 10 mg/L
14% of EPA limit
Arsenic0.0008 / 0.01 mg/L
8% of EPA limit
Copper47.6 / 1300 ug/L
4% of EPA limit
Radium0.57 / 5 pCi/L
11% of EPA limit
Gross Alpha Radiation6.1 / 15 pCi/L
40% of EPA limit
Total Trihalomethanes13.5 / 80 ug/L
17% of EPA limit
Haloacetic Acids (HAA5)46.9 / 60 ug/L
78% of EPA limit
Nickel0.0267 mg/L
UnregulatedInorganic
Selenium0.001 / 0.05 mg/L
2% of EPA limit
Styrene1 / 100 ug/L
1% of EPA limit
Barium0.0043 / 2 mg/L
0% of EPA limit
Fluoride0.49 / 4 mg/L
12% of EPA limit
PFHpA (Perfluoroheptanoic Acid)0.973 ng/L
UnregulatedPFAS
PFAS (5 compounds detected)
Microplastics (not routinely tested)

Water systems serving Osseo

OSSEO WATERWORKS

1,701 servedGroundwater14 contaminants3 above guidelines
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Other cities in Trempealeau County

Water quality reports for nearby Wisconsin communities.

ArcadiaBlairDodgeElevaEttrickGalesvilleIndependencePigeon FallsStrumTrempealeauWhitehall

Frequently asked questions

Is Osseo, WI tap water safe to drink?
Osseo tap water meets EPA legal standards (Maximum Contaminant Levels). However, 3 contaminants are present above independent health guidelines, which are often stricter than legal limits. 14 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 Osseo water?
Monitoring has detected 14 contaminants in Osseo's water supply: Lead, Nitrate, Arsenic, Copper, Radium, Gross Alpha Radiation, Total Trihalomethanes, Haloacetic Acids (HAA5), Nickel, Selenium, Styrene, Barium, Fluoride, PFHpA (Perfluoroheptanoic Acid). Additionally, 5 PFAS compounds have been detected at trace levels. 3 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Osseo water have PFAS?
Yes. 5 PFAS compounds have been detected in Osseo'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 Osseo water hard?
Yes. Osseo water has a hardness of 162 mg/L (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 Osseo get its drinking water?
Osseo'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. Osseo is served by one water system: OSSEO WATERWORKS.

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