Buttressed by stricter limits on drinking water, sector-specific regulation and expanded reporting requirements, the regulatory environment for PFAS will become more rigorous in both the United States and the European Union. However, a diverse and fragmented approach to PFAS regulation will still exist, with a significant number of PFAS-related bills having been introduced across a wide range of states in the United States. These efforts are filling a space increasingly vacated by the federal Environmental Protection Agency (EPA). EU Member States also voted in support of a Commission proposal to ban all PFAS in firefighting foams in April 2025, with a staged transition period and sector-specific extensions. However, compliance deadlines remain uncertain. The EPA is now expected to confirm in Spring 2026 that it will be extending the compliance deadline to achieve PFOA and PFOS Maximum Contaminant Levels in drinking water from 2029 to 2031. In the European Union, the outcome of proposals for a 'universal' PFAS restriction under REACH has been postponed, with the European Chemicals Agency's scientific evaluation now scheduled to conclude by the end of 2026.