GenX (HFPO-DA) and other per- and polyfluoroalkyl ether acids (PFEAs) are the next generation of PFAS compounds. Companies developed them to replace older perfluorooctanoic acid (PFOA). We’ve found them in contaminants-of-emerging-concern-in-source-and-treated-drinking-waters-of-the-united-states/”>drinking water sources near fluorochemical plants. Now, the EPA sets maximum contaminant levels for them under the 2024 PFAS National Primary Drinking Water Regulation. Unlike long-chain PFAS, PFEAs don’t stick around in the environment as long, but they still build up in fish and other aquatic life. Even at tiny parts-per-trillion concentrations, they can cause liver and developmental problems. So, how do we get rid of them? Granular activated carbon, high-pressure membranes, and anion exchange resins are the main ways we know work for these compounds.

\\n\\nHopkins, Z. R.; Sun, M.; DeWitt, J. C.; Knappe, D. R. U.\\n\\nJournal – American Water Works Association, 110 (7):13-28; 10.1002/awwa.1073 2018\\n\\nAbstract:For decades, a common processing aid for making fluoropolymers was ammonium salt of perfluorooctanoic acid (PFOA). PFOA lasts a long time, builds up in living things, and is toxic, so the US is phasing out its production and use. In 2009, the US Environmental Protection Agency set rules for making and using GenX, which replaced PFOA. While companies make GenX on purpose, its acid form also shows up as a byproduct when they make fluoromonomers. When researchers found high levels of GenX and related perfluoroalkyl ether acids (PFEAs) in the Cape Fear River and in the drinking water for over 200,000 North Carolina residents, everyone had to act fast. Researchers, regulators, public health officials, commercial labs, drinking water providers, and engineers all jumped in. This paper gives you details about where GenX comes from, how toxic it is, and a way to test for GenX and eight related PFEAs. It also talks about where we find GenX-PFEA in water and how different drinking water treatment methods remove it. © 2018 American Water Works Association.\\n\\nThe post Recently detected drinking water contaminants: genX and other Per- and polyfluoroalkyl ether acids. appeared first on Facts About Water.\\n\\nSource: Water Feed