PFAS regulation in drinking water varies significantly around the world, with different countries setting different standards, testing different compound lists, and implementing different timelines for compliance. Understanding global approaches provides context for US EPA’s 2024 PFAS rule and informs expectations for filter technology standards internationally.
United States EPA 2024 Rule
EPA’s 2024 final rule established individual MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFNA, PFHxS, and HFPO-DA (GenX), plus a hazard index approach for mixtures. Public water systems have until 2029 to comply. This represents among the most stringent PFAS drinking water standards in the world and has driven significant filter certification activity as manufacturers seek to demonstrate compliance-level performance.
European Union
The EU’s revised Drinking Water Directive sets a 0.1 ppt limit for individual PFAS compounds and a 0.5 ppt limit for total PFAS sum in drinking water — considerably more stringent than current US standards for individual compounds. EU member states are implementing these limits with compliance timelines through 2026. The EU limits effectively require treatment to detection limits for many PFAS compounds, driving adoption of high-performance technologies including ion exchange and advanced oxidation for PFAS destruction.
Australia, Canada, and Other Countries
Australia has adopted health-based guidance values for PFAS in drinking water through its NHMRC, with values generally comparable to former EPA health advisories. Canada’s Guidelines for Canadian Drinking Water Quality set maximum acceptable concentrations for PFOA and PFOS. Japan has established provisional target values for PFAS. These varying regulatory frameworks reflect both different risk assessment methodologies and different policy choices about acceptable residual risk.