“Even when the researchers shifted their analysis to a higher level of 10 ppt, they still found some 18 million to 80 million Americans to be exposed.”
More than 200 million Americans likely drink water with PFAS in it. The chemicals take hundreds to thousands of years to break down. Industry moved from PFOA and PFOS to hundreds of replacements that are just as persistent, and regulators never caught up. The plan is still to set enforceable limits someday.