EPA May See Difficulties Defending CERCLA PFAS Rule After Chevron’s End

The Supreme Court’s decision overturning Chevron deference to EPA and other federal agencies’ interpretations of ambiguous statutory language could add new challenges for the agency as it seeks to defend its first-of-its-kind Superfund rule designating the two most studied PFAS as “hazardous substances” under the law’s section 102, sources say. The high court’s new ruling will “certainly make this particular litigation [over the Superfund PFAS rule] more difficult,” says former EPA Region 2 official Walter Mugdan. But at the...