Water Quality Report
Theresa, WI
Dodge County · 1,262 residents · 1 water system
14
Contaminants detected
0
PFAS compounds
—
Hardness (mg/L)
1
Above legal limits
3
Above health guidelines
Theresa 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 testing has been conducted with no detections.
Contaminants detected in Theresa water
Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.
Lead0.00067 / 0.015 mg/L
4% of EPA limit
Nitrate0.1 / 10 mg/L
1% of EPA limit
Arsenic0.00056 / 0.01 mg/L
6% of EPA limit
Copper70 / 1300 ug/L
5% of EPA limit
Radium6.1 / 5 pCi/L
122% of EPA limit
Uranium0.548 / 30 ug/L
2% of EPA limit
Gross Alpha Radiation9.3 / 15 pCi/L
62% of EPA limit
Total Trihalomethanes4.8 / 80 ug/L
6% of EPA limit
Haloacetic Acids (HAA5)1.3 / 60 ug/L
2% of EPA limit
Nickel0.0017 mg/L
UnregulatedInorganic
Methyl Tert Butyl Ether1.7 ug/L
Unregulated
Fluoride0.46 / 4 mg/L
12% of EPA limit
Chromium (total)0.0015 / 0.1 mg/L
2% of EPA limit
Barium0.043 / 2 mg/L
2% of EPA limit
PFAS (tested — none detected)
Microplastics (not routinely tested)
Water systems serving Theresa
Other cities in Dodge County
Water quality reports for nearby Wisconsin communities.
Frequently asked questions
Is Theresa, WI tap water safe to drink?
Theresa tap water has 1 contaminant currently measured above EPA legal standards (Maximum Contaminant Levels), and 3 above independent health guidelines. 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, how they compare to both legal limits and health guidelines, and what actions to take.
What contaminants are in Theresa water?
Monitoring has detected 14 contaminants in Theresa's water supply: Lead, Nitrate, Arsenic, Copper, Radium, Uranium, Gross Alpha Radiation, Total Trihalomethanes, Haloacetic Acids (HAA5), Nickel, Methyl Tert Butyl Ether, Fluoride, Chromium (total), Barium. 1 of these are above EPA legal limits. 3 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Theresa water have PFAS?
Theresa's water has been tested for PFAS compounds with no detections. Testing was conducted as part of the EPA's Unregulated Contaminant Monitoring Rule (UCMR5) program.
Where does Theresa get its drinking water?
Theresa'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. Theresa is served by one water system: THERESA WATERWORKS.
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