The Ninth Circuit denied an environmental group's petition to review EPA's approval of a Montana SIP revision. The group argued that the approval was arbitrary and capricious because Montana's Department of Environmental Quality interpreted one of the SIP's provisions less stringently than the CAA a...

The D.C. Circuit vacated EPA's rule delaying the 2017 Chemical Disaster Rule, which established safety standards for chemical facilities. The Agency argued that it had authority under CAA §112 to delay the effective date of the Rule beyond the ninety-day limit set forth in CAA §307 because ninety ...

A state review board affirmed the Washington Department of Ecology's denial of a CWA §401 certification requested by a coal company for a proposed coal export terminal. The company argued that its request was categorically exempt from the State Environmental Policy Act (SEPA), and that the departme...

A district court ruled in favor of environmental groups' challenge EPA's rule suspending the 2015 Waters of the United States Rule (WOTUS Rule), and enjoined the suspension rule nationwide. The groups argued that the suspension rule violated the APA by refusing to solicit public comments on the meri...