Water Quality Report
Sister Bay, WI
Door County · 1,000 residents · 1 water system
9
Contaminants detected
0
PFAS compounds
—
Hardness (mg/L)
0
Above legal limits
1
Above health guidelines
Sister Bay 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.
Contaminants detected in Sister Bay water
Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.
Lead0.0061 / 0.015 mg/L
41% of EPA limit
Nitrate2.8 / 10 mg/L
28% of EPA limit
Copper260 / 1300 ug/L
20% of EPA limit
Total Trihalomethanes7.9 / 80 ug/L
10% of EPA limit
Haloacetic Acids (HAA5)2.4 / 60 ug/L
4% of EPA limit
Nickel0.0017 mg/L
UnregulatedInorganic
Selenium0.0013 / 0.05 mg/L
3% of EPA limit
Barium0.055 / 2 mg/L
3% of EPA limit
Fluoride0.62 / 4 mg/L
16% of EPA limit
Microplastics (not routinely tested)
Water systems serving Sister Bay
Other cities in Door County
Water quality reports for nearby Wisconsin communities.
Frequently asked questions
Is Sister Bay, WI tap water safe to drink?
Sister Bay tap water meets EPA legal standards (Maximum Contaminant Levels). However, 1 contaminant is present above independent health guidelines, which are often stricter than legal limits. 9 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5). 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 Sister Bay water?
Monitoring has detected 9 contaminants in Sister Bay's water supply: Lead, Nitrate, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5), Nickel, Selenium, Barium, Fluoride. 1 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Where does Sister Bay get its drinking water?
Sister Bay'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. Sister Bay is served by one water system: SISTER BAY WATERWORKS.
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