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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).

Jan 10, 2025 · The PFOS toxicity assessment provides hazard identification, dose-response information, and derives toxicity values called oral reference doses (RfDs) and cancer slope factors (CSFs). The assessment underwent external peer review by the EPA’s Science Advisory Board (SAB) and public comment.

Jun 30, 2024 · What is PFOS? Perfluorooctanesulfonic acid (PFOS) was the other most widely detected and produced PFAS class chemical until it was also banned in 2016. Starting in the 1940s, PFOS was used in many consumer and industrial products including carpets, upholstered furniture, nonstick cookware and leather products, as well as paints, varnishes ...

Dec 5, 2017 · This fact sheet provides a summary of two contaminants of emerging concern, perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA), including physical and chemical properties; environmental and health impacts; existing federal and state guidelines; detection and treatment methods; and additional sources of information.

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Mar 18, 2025 · Basic information about PFOA, PFOS and other PFAS/PFCs; how people are exposed; health effects; laws and regs that apply; and what EPA and states are doing to reduce exposures.

Nov 1, 2023 · Per-and-polyfluoroalkyl substances (PFAS) are a collective name for a broad class of man-made chemicals of emerging concern that have recently been in the spotlight due to potential human and environmental health risks. While the public attention to PFAS is relatively new, the chemicals have been used globally since the 1940s.

Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) are part of a large group of lab-made chemicals known as perfluoroalkyl and polyfluoroalkyl substances (PFAS). Some of these chemicals have been in commercial use since the 1940s.

The PFOS toxicity assessment identified adverse health effects associated with PFOS exposure using a robust systematic review process based on EPA peer-reviewed human health risk assessment methodology