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Different organizations use different definitions for PFAS, leading to estimates of between 8,000 and 7 million chemicals within the group. The EPA toxicity database, DSSTox, lists 14,735 unique PFAS chemical compounds. [44] [45] An early definition required that they contain at least one perfluoroalkyl moiety, −C n F 2n+1. [14]
Fluorosurfactants (PFAS) reduce surface tension by concentrating at the liquid-air interface due to the lipophobicity of polyfluorocarbons. Chlorofluorocarbons are also perfluorinated compounds, many of which were formerly used as refrigerants until they were implicated in ozone degradation.
March 2018 The United States Department of Defense's (DoD)'s report to Congress said that test that they conducted showed that the amount of PFAS chemicals in water supplies near 126 DoD facilities, "exceeded the current safety guidelines". [71] The DoD has "used foam containing" PFAS chemicals "in exercises at bases across the country".
Toxic chemicals called PFAS are in pesticides sprayed on food and included in pet flea treatments and home bug repellants, a new study found. ... Science & Tech. Sports. Weather. 24/7 Help.
PFAS, or perfluoroalkyl and polyfluoroalkyl substances, are a group of chemicals that have been around for decades and have now spread into the nation's air, water and soil.
PFAS, linked to some cancers and other health risks, are a chief concern for water utility operators. 'Forever chemicals': What is the level of PFAS in Louisville’s drinking water? Skip to main ...
In 2024, a worldwide study of 45,000 groundwater samples found that 31% of samples contained levels of PFAS that were harmful to human health; these samples were taken from areas not near any obvious source of contamination. [52] Soil is also contaminated and the chemicals have been found in remote areas such as Antarctica. [53]
In short, the rule sets limits on several common types of PFAS. The EPA says there is enough evidence to limit PFOA and PFOS at the lowest level they can be reliably detected. For some other types, the limit is 10 parts per trillion, and there are also limits on certain PFAS combinations. Water providers will have three years to test for PFAS.