Over the last several weeks, appellate courts in two states have issued decisions with varying impacts on per- and polyfluoroalkyl substances (PFAS) regulations at the state level. In New Jersey, the New Jersey Appeals Court has upheld the strict PFAS drinking water standards promulgated by the New Jersey Department of Environmental Protection in an opinion issued Aug. 3, 2023. In contrast, just yesterday, a Michigan appeals court invalidated the PFAS drinking water standards issued by the Michigan Department of Environment, Great Lakes, and Energy (EGLE).