Brown County · 159,450 residents · 6 water systems
12
Contaminants detected
5
PFAS compounds
262
Hardness (mg/L)
2
Above legal limits
10
Above health guidelines
Green Bay drinking water comes from a mix of groundwater and surface water sources. Based on the most recent monitoring data, 12 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Total Trihalomethanes, and 8 others. PFAS compounds have been detected at trace levels in Green Bay water. Water hardness is 262 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.
Contaminants detected in Green Bay water
12 total
Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.
Green Bay tap water has 2 contaminants currently measured above EPA legal standards (Maximum Contaminant Levels), and 10 above independent health guidelines. 12 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, how they compare to both legal limits and health guidelines, and what actions to take.
What contaminants are in Green Bay water?
Monitoring has detected 12 contaminants in Green Bay's water supply: Lead, Nitrate, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5), Atrazine, Bromate, Fluoride, Barium, PFHpA (Perfluoroheptanoic Acid), Bromide, Toc. Additionally, 5 PFAS compounds have been detected at trace levels. 2 of these are above EPA legal limits. 10 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Green Bay water have PFAS?
Yes. 5 PFAS compounds have been detected in Green Bay'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.
Is Green Bay water hard?
Yes. Green Bay water has a hardness of 262 mg/L (very hard). Hard water is not a health concern but can cause scale buildup in water heaters and appliances, reduce soap effectiveness, and leave mineral deposits. Water softeners or conditioning systems can address hardness.
Where does Green Bay get its drinking water?
Green Bay's drinking water comes from a combination of groundwater and surface water sources. The water is treated and tested according to Wisconsin DNR and EPA requirements before distribution. Green Bay is served by 6 water systems, the largest being GREEN BAY WATERWORKS (serving 107,369 people).
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