Water Quality Report
Oconto, WI
Oconto County · 4,610 residents · 1 water system
11
Contaminants detected
1
PFAS compounds
—
Hardness (mg/L)
1
Above legal limits
2
Above health guidelines
Oconto drinking water comes from groundwater wells. Based on the most recent monitoring data, 11 contaminants have been detected in the water supply, including Lead, Copper, Radium, Uranium, and 7 others. PFAS compounds have been detected at trace levels in Oconto water.
Contaminants detected in Oconto water
Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.
Lead0.0029 / 0.015 mg/L
19% of EPA limit
Copper130 / 1300 ug/L
10% of EPA limit
Radium5.1 / 5 pCi/L
103% of EPA limit
Uranium0.422 / 30 ug/L
1% of EPA limit
Gross Alpha Radiation10 / 15 pCi/L
67% of EPA limit
Total Trihalomethanes2.9 / 80 ug/L
4% of EPA limit
Haloacetic Acids (HAA5)0.92 / 60 ug/L
2% of EPA limit
Nickel0.001 mg/L
UnregulatedInorganic
Barium0.027 / 2 mg/L
1% of EPA limit
Fluoride2.1 / 4 mg/L
53% of EPA limit
Lithium16 ug/L
Unregulated
PFAS (1 compounds detected)
Microplastics (not routinely tested)
Water systems serving Oconto
Other cities in Oconto County
Water quality reports for nearby Wisconsin communities.
Frequently asked questions
Is Oconto, WI tap water safe to drink?
Oconto tap water has 1 contaminant currently measured above EPA legal standards (Maximum Contaminant Levels), and 2 above independent health guidelines. 11 contaminants have been detected in the water supply, including Lead, Copper, Radium, Uranium, Gross Alpha Radiation. 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 Oconto water?
Monitoring has detected 11 contaminants in Oconto's water supply: Lead, Copper, Radium, Uranium, Gross Alpha Radiation, Total Trihalomethanes, Haloacetic Acids (HAA5), Nickel, Barium, Fluoride, Lithium. Additionally, 1 PFAS compounds have been detected at trace levels. 1 of these are above EPA legal limits. 2 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Oconto water have PFAS?
Yes. 1 PFAS compounds have been detected in Oconto'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 Oconto get its drinking water?
Oconto'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. Oconto is served by one water system: OCONTO WATERWORKS.
Check your water quality
Enter your address for a detailed report specific to your water system.
On a private well? Search your address for nearby groundwater monitoring data.