It’s been a little over a year since the Environmental Protection Agency rolled out the first legally-enforceable limits on some PFAS chemicals in drinking water. The regulation came after years of research tying the human-made chemicals to a range of health issues. … Under the EPA’s first formal limits last year, drinking water can have no more than four parts per trillion of the PFAS listed. … Tucson is already in compliance. But (Tucson Water Director John) Kmiec estimates the city has spent some $70 million of its own money to get there. Additional federal funding came down for communities nationwide last year — including a roughly $33 million for Tucson. That’ll be used to build a new treatment plant Kmiec says will bring a handful of wells back online and some 3.3 million gallons of drinking water back into the system. … But some things are changing now, under the Trump administration. A directive released by the EPA in May drops four out of the six compounds listed in 2024. Only PFOA and PFOS will remain regulated for now.

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