Water Quality Report
Norwalk, WI
Monroe County · 653 residents · 1 water system
9
Contaminants detected
0
PFAS compounds
—
Hardness (mg/L)
0
Above legal limits
0
Above health guidelines
Norwalk 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, Copper, Total Trihalomethanes, and 5 others. PFAS testing has been conducted with no detections.
Contaminants detected in Norwalk 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
Nitrate0.003 / 10 mg/L
0% of EPA limit
Copper119 / 1300 ug/L
9% of EPA limit
Total Trihalomethanes4.4 / 80 ug/L
5% of EPA limit
Haloacetic Acids (HAA5)5 / 60 ug/L
8% of EPA limit
Styrene0.89 / 100 ug/L
1% of EPA limit
Barium0.0569 / 2 mg/L
3% of EPA limit
Fluoride0.16 / 4 mg/L
4% of EPA limit
Nitrite0.088 / 1 mg/L
9% of EPA limit
PFAS (tested — none detected)
Microplastics (not routinely tested)
Water systems serving Norwalk
Other cities in Monroe County
Water quality reports for nearby Wisconsin communities.
Frequently asked questions
Is Norwalk, WI tap water safe to drink?
Norwalk tap water meets EPA legal standards (Maximum Contaminant Levels) and independent health guidelines. 9 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5). Detection does not necessarily mean unsafe levels. View the detailed report for each water system to see specific levels.
What contaminants are in Norwalk water?
Monitoring has detected 9 contaminants in Norwalk's water supply: Lead, Nitrate, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5), Styrene, Barium, Fluoride, Nitrite. See individual system reports for concentrations relative to EPA limits.
Does Norwalk water have PFAS?
Norwalk'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 Norwalk get its drinking water?
Norwalk'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. Norwalk is served by one water system: NORWALK WATERWORKS.
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