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Learn what is in your water — a plain-language library of waterborne contaminants, their health effects, and the filtration that removes them.
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11Cl-PF3OUdS
11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid
PFASA chlorinated perfluoroether sulfonic acid (8:2 Cl-PFESA), the minor component of F-53B chromium-plating mist suppressant. Persistent and bioaccumulative; detected at low ppt levels in U.S. drinking water under UCMR 5.
ADONA
4,8-dioxa-3H-perfluorononanoic acid
PFASA perfluoroether carboxylic acid developed by 3M/Dyneon as a PFOA replacement for fluoropolymer manufacturing. Persistent in the environment; detected at low ppt levels in U.S. drinking water under EPA's UCMR 5 monitoring program.
4:2 FTS
4:2 Fluorotelomer Sulfonic Acid
PFASA short-chain fluorotelomer sulfonic acid (4 perfluorinated + 2 alkyl carbons), formed as a degradation product of fluorotelomer-based aqueous film-forming foam (AFFF). Detected at low ppt levels in U.S. drinking water under UCMR 5.
6:2 FTS
6:2 Fluorotelomer Sulfonic Acid
PFASA short-chain fluorotelomer sulfonic acid (6 perfluorinated + 2 alkyl carbons) and the principal PFAS-replacement chemistry in post-2002 AFFF firefighting foams. Detected in 275 U.S. utilities serving ~15 million people under UCMR 5.
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