On December 5, 2022, the U.S. Environmental Protection Agency published a proposed rule to add all per- and polyfluoroalkyl substances (PFAS) subject to reporting under the Emergency Planning and Community Right-to-Know Act to the list of chemicals of special concern. The addition of PFAS to the list of chemicals of special concern will subject them to the same, more burdensome reporting requirements as other chemicals of special concern, including eliminating availability of the de minimis exemption for purposes of calculating reporting thresholds.