US air force avoids PFAS water cleanup, citing supreme court’s Chevron ruling

The US air force is refusing to comply with an order to clean drinking water it polluted in Tucson, Arizona, claiming federal regulators lack authority after the conservative-dominated US supreme court overturned the "Chevron doctrine". Air force bases contaminated the water with toxic PFAS "forever chemicals" and other dangerous compounds.

Though former US Environmental Protection Agency (EPA) officials and legal experts who reviewed the air force's claim say the Chevron doctrine ruling probably would not apply to the order, the military's claim that it would represents an early indication of how polluters will wield the controversial court decision to evade responsibility.

It appears the air force is essentially attempting to expand the scope of the court's ruling to thwart regulatory orders not covered by the decision, said Deborah Ann Sivas, director of the Stanford University Environmental Law Clinic.

"It's very odd," she added. "It feels almost like an intimidation tactic, but it will be interesting to see if others take this approach and it bleeds over."

The supreme court in late June overturned the 40-year-old Chevron doctrine, one of its most important precedents. The decision sharply cut regulators' power by giving judges the final say in interpreting ambiguous areas of the law during rule-making. Judges previously gave deference to regulatory agency experts on such questions.

The ruling is expected to have a profound impact on the EPA's ability to protect the public from pollution, and the Tucson dispute highlights the high stakes in such scenarios - clean drinking water and the health of hundreds of thousands of people hangs in the balance.

Several air force bases are largely responsible for trichloroethylene (TCE) - volatile organic compounds - and PFAS contaminating drinking water sources in Tucson. A 10-sq-mile (26 sq km) area around the facilities and Tucson international airport were in the 1980s designated as a Superfund site, an action reserved for the nation's most polluted areas.