Trump EPA moves to weaken Biden-era PFAS drinking-water limits

The Trump administration is preparing to loosen key Biden-era drinking-water limits for PFAS, a move that could reshape protections for the chemicals linked to cancer, cardiovascular disease and low birth weight. The plan would keep standards for two of the most common compounds, PFOA and PFOS, but delay enforcement and rescind limits on some rarer PFAS forms.

At the center of the rollback is a rule finalized on April 10, 2024, when the Biden-Harris administration issued the first-ever national, legally enforceable drinking-water standard for PFAS under the Safe Drinking Water Act. The Environmental Protection Agency set enforceable limits of 4.0 parts per trillion for PFOA and PFOS individually and covered six chemicals in all: PFOA, PFOS, PFHxS, PFNA, GenX, also called HFPO-DA, and PFBS. EPA said the rule would protect about 100 million people served by public-water systems, after the agency received more than 120,000 public comments.

Jessica Kramer, who heads EPA’s Office of Water, said at a conference in Washington that the agency wants rules that are legally defensible and not vulnerable to challenge because of concerns that the earlier process did not fully follow the Safe Drinking Water Act. The agency’s current position reflects a shift that began in May 2025, when EPA signaled it intended to delay compliance deadlines for PFOA and PFOS until 2031 and to rescind and reconsider the regulatory determinations for PFHxS, PFNA, HFPO-DA and the PFAS mixture hazard index.

The public-health stakes are substantial because PFAS contamination is widespread and expensive to address. EPA says it remains committed to helping utilities cut PFAS in drinking water through technical assistance and billions of dollars in additional funding for treatment systems. Water utilities have pressed the agency for clear, workable standards and more time to finance upgrades, arguing that compliance requires costly filtration and long planning timelines.

Environmental advocates say the rollback would weaken safeguards before communities have recovered from years of contamination. Earthjustice called the plan illegal and warned that many communities are still grappling with polluted water supplies. The proposal also comes as the Make America Healthy Again movement, championed by Health Secretary Robert F. Kennedy Jr., has put PFAS under renewed political scrutiny alongside pesticides.

The next step is a formal proposal, which would open the door to heavy pressure from utilities, environmental groups, states and industry. For millions of people living near contaminated wells and public systems, the outcome will determine whether PFAS limits remain a national backstop or become easier to challenge and harder to enforce.