Water Quality Report
Lewiston, MN
Winona County · 1,512 residents · 1 water system
9
Contaminants detected
0
PFAS compounds
—
Hardness (mg/L)
0
Above legal limits
3
Above health guidelines
Lewiston drinking water comes from groundwater wells. Based on the most recent monitoring data, 9 contaminants have been detected in the water supply, including Lead, Nitrate, Arsenic, Radium, and 5 others.
Contaminants detected in Lewiston water
Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.
Lead0 / 0.015 mg/L
0% of EPA limit
Nitrate0.025 / 10 mg/L
0% of EPA limit
Arsenic0.0027 / 0.01 mg/L
27% of EPA limit
Radium2.9 / 5 pCi/L
58% of EPA limit
Uranium1.8 / 30 ug/L
6% of EPA limit
Trichloroethylene0.05 / 5 ug/L
1% of EPA limit
Tetrachloroethylene0.1 / 5 ug/L
2% of EPA limit
Total Trihalomethanes0.6 / 80 ug/L
1% of EPA limit
Haloacetic Acids (HAA5)1 / 60 ug/L
2% of EPA limit
Microplastics (not routinely tested)
Water systems serving Lewiston
Other cities in Winona County
Water quality reports for nearby Minnesota communities.
Frequently asked questions
Is Lewiston, MN tap water safe to drink?
Lewiston 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. 9 contaminants have been detected in the water supply, including Lead, Nitrate, Arsenic, Radium, Uranium. 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 Lewiston water?
Monitoring has detected 9 contaminants in Lewiston's water supply: Lead, Nitrate, Arsenic, Radium, Uranium, Trichloroethylene, Tetrachloroethylene, Total Trihalomethanes, Haloacetic Acids (HAA5). 3 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Where does Lewiston get its drinking water?
Lewiston's drinking water comes from groundwater wells that draw from underground aquifers. The water is treated and tested according to Minnesota Department of Health and EPA requirements before distribution. Lewiston is served by one water system: Lewiston.
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