With the looming possibility that the Trump administration could reduce federal limits on toxic PFAS chemicals in drinking water, public health advocates are warning that people across the country would suffer. Concerns for the future of the federal limits come amid ongoing litigation over the federal limits on six per- and polyfluoroalkyl substances (PFAS) in drinking water. A 60-day stay on the litigation granted in February ends Tuesday, after which the Trump administration could seek to make changes to the standards, which were put into place a year ago under the Biden administration. The Biden-era rule requires public water systems to complete initial monitoring for the PFAS  chemicals by 2027, and to implement technologies for reducing PFAS in their water by 2029 if levels exceed the limit. … The Trump administration has not stated if it will seek to rework the rule but those who helped fight for PFAS mitigation measures say they fear for its future.