On April 10, 2024, the U.S. Environmental Protection Agency announced a final national drinking-water rule setting enforceable limits for five individual PFAS and a mixture measure for four chemicals. For public water systems, the first work is monitoring and disclosure; treatment follows when results exceed the standards. [S1]
All public water systems covered by the rule have three years to complete initial monitoring and must tell customers the measured PFAS levels. If a system finds levels above the standards, it has five years to implement a solution. EPA lists granular activated carbon, reverse osmosis and ion exchange among the available treatment approaches; the rule does not prescribe one technology for every system. [S1]
The scope is narrower than a universal treatment mandate. EPA estimated that about 6% to 10% of the roughly 66,000 systems subject to the rule may need to reduce PFAS to meet the limits. That is an agency estimate, not a count of systems later found to be out of compliance. [S1]
The agency also announced nearly $1 billion for states and territories to support PFAS testing and treatment at public systems and to help private-well owners address contamination. The funding sits within a larger $9 billion federal allocation for drinking water affected by PFAS and other emerging contaminants. For utilities and local officials, the practical planning question is therefore two-stage: establish what is in the water, then match any required response to the measured level and available support. [S1]
Source documents
- Biden-Harris Administration Finalizes First-Ever National Drinking Water Standard to Protect 100M People from PFAS Pollutionhttps://www.epa.gov/newsreleases/biden-harris-administration-finalizes-first-ever-national-drinking-water-standard