Illinois has become the latest state to issue formal Health Advisories for a number of Per- and Polyfluoroalkyl Substances (PFAS). The Health Advisories are for four compounds—Perfluorobutanesulfonic (PFBS) (140,000 parts per trillion “ppt”); Perfluorohexanesulfonic acid (PFHxS) (140 ppt); Perfluorooctanoic acid (PFOA) (2 ppt); and Perfluorohexanoic acid (PFHxA) (560,000 ppt)—and the Illinois Environmental Protection Agency (EPA)