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You might have seen recent news reports about per- and polyfluoroalkyl substances (together abbreviated as PFAS). These are a class of human-made chemicals typically associated with non-stick coatings, waterproofing, stain-proofing treatments and fire-fighting foams. The Federal EPA or the Wisconsin Department of Natural Resources (DNR) has yet to set a standard or regulation for these contaminants. However, Green Bay Water began testing for PFAS in 2018 and has not seen a concerning amount of this manufactured substance based on current research. Given Green Bay Water Utility’s freshwater source in the depths of Lake Michigan (a mile from the shore of Kewaunee and 60 feet deep!) our levels continue to remain low. Our water quality team is closely watching the science as this topic evolves and more information becomes available.
For more information on PFAS: 
American Water Works Association: https://www.awwa.org/Resources-Tools/Resource-Topics/PFAS
Centers for Disease Control: https://www.cdc.gov/biomonitoring/PFAS_FactSheet.html
Wisconsin DNR: https://dnr.wisconsin.gov/topic/PFAS