Water Quality Report
Mercer, WI
Iron County · 760 residents · 1 water system
8
Contaminants detected
1
PFAS compounds
—
Hardness (mg/L)
0
Above legal limits
3
Above health guidelines
Mercer drinking water comes from groundwater wells. Based on the most recent monitoring data, 8 contaminants have been detected in the water supply, including Lead, Nitrate, Arsenic, Copper, and 4 others. PFAS compounds have been detected at trace levels in Mercer water.
Contaminants detected in Mercer water
Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.
Lead0.0036 / 0.015 mg/L
24% of EPA limit
Nitrate0.88 / 10 mg/L
9% of EPA limit
Arsenic0.002 / 0.01 mg/L
20% of EPA limit
Copper360 / 1300 ug/L
28% of EPA limit
Total Trihalomethanes16.2 / 80 ug/L
20% of EPA limit
Haloacetic Acids (HAA5)3.6 / 60 ug/L
6% of EPA limit
Barium0.021 / 2 mg/L
1% of EPA limit
Fluoride0.082 / 4 mg/L
2% of EPA limit
PFAS (1 compounds detected)
Microplastics (not routinely tested)
Water systems serving Mercer
Other cities in Iron County
Water quality reports for nearby Wisconsin communities.
Frequently asked questions
Is Mercer, WI tap water safe to drink?
Mercer 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. 8 contaminants have been detected in the water supply, including Lead, Nitrate, Arsenic, Copper, Total Trihalomethanes. 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 Mercer water?
Monitoring has detected 8 contaminants in Mercer's water supply: Lead, Nitrate, Arsenic, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5), Barium, Fluoride. Additionally, 1 PFAS compounds have been detected at trace levels. 3 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Mercer water have PFAS?
Yes. 1 PFAS compounds have been detected in Mercer'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 Mercer get its drinking water?
Mercer'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. Mercer is served by one water system: MERCER SANITARY DISTRICT.
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