A U.S. Geological Survey found 45% of U.S. tap water is contaminated with per- and polyfluoroalkyl substances (PFAS) chemicals, with measured concentrations in both private wells and public water sources.
Authors of the study “estimate that at least one PFAS could be detected in about 45% of U.S. drinking-water samples.” Although there are more than 12,000 different types of PFAS, only 32 are detectable by USGS lab tests, so 45% is likely a low estimate.
PFAS are a group of chemicals found in a variety of common household products such as nonstick pans and stain-resistant carpeting, as well as pesticides and biosolids used as fertilizer.
Long-chain PFAS, such as perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), are more widely known because of their high toxicity and controversial use in the past.
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