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The concentrations are so small that chemists testing water for PFAS often have to remove their makeup because beauty products can contain enough PFAS to throw off a test’s accuracy.
The United States Environmental Protection Agency defines PFAS in the Drinking Water Contaminant Candidate List 5 as substances that contain "at least one of the following three structures: R−CF 2 −CF(R')R", where both the −CF 2 − and −CF− moieties are saturated carbons, and none of the R groups can be hydrogen; R−CF 2 −O−CF 2 ...
Because PFAS can often be found together in mixtures, EPA is also setting a limit for any combination of four PFAS. This standard will reduce PFAS exposure in drinking water to the lowest levels ...
PFAS is an umbrella term that refers to more than 12,000 man-made chemical compounds that contain various chemical structures with at least one common characteristic: the presence of carbon ...
The Toxic Substances Control Act (TSCA) is a United States law, passed by the 94th United States Congress in 1976 and administered by the United States Environmental Protection Agency (EPA), that regulates chemicals not regulated by other U.S. federal statutes, [1] including chemicals already in commerce and the introduction of new chemicals.
A new EU drinking water directive issued in 2020 adopted PFAS limit values. The limit values are 0.1 μg/L for the sum of 20 PFASs including PFHxS, and 0.5 μg/L for the sum of all PFASs. This directive is binding for all EU member nations. It is a minimum directive, and member states can elect to adopt stricter regulations. [19]
In 2023, the U.S. Geological Survey estimated that 45% of America’s tap water contained one or more of the 32 specific PFAS compounds it tested for, including in Kansas, Missouri, Illinois ...
Perfluorooctanesulfonic acid (PFOS) (conjugate base perfluorooctanesulfonate) is a chemical compound having an eight-carbon fluorocarbon chain and a sulfonic acid functional group, and thus it is a perfluorosulfonic acid and a perfluoroalkyl substance (PFAS).