The Sixth Circuit granted the Commonwealth of Kentucky's and business groups' motions to preliminarily enjoin EPA's and the Army Corps of Engineers' 2023 rule revising the definition of "waters of the United States" under the CWA. A district court had denied the motions, concluding plaintiffs lacked...

The D.C. Circuit vacated EPA's withdrawal of its determination to regulate perchlorate in drinking water. An environmental group argued EPA lacked the authority to withdraw the determination under the SDWA, and that even if it did have such authority, it acted arbitrarily and capriciously in doing s...

A district court adopted the recommendations of a magistrate judge and vacated portions of NMFS' 2019 biological opinion concerning the incidental take statement that authorized take of southern resident killer whales and chinook salmon resulting from commercial harvest of chinook salmon during trol...

A district court granted environmental groups' motion to preliminarily enjoin a logging project in the Kootenai National Forest. The groups argued the project violated the ESA by failing to adequately consider the impacts of unauthorized motorized access on grizzly bears in the project area. The cou...

The Fourth Circuit, 2-1, vacated a district court ruling in a lawsuit concerning the Army Corps of Engineers' plan for maintaining a dam on the Savannah River. The state of South Carolina argued the Corps' plan violated the Water Infrastructure Improvements for the Nation (WIIN) Act because it would...

A district court granted 24 states' motion to preliminarily enjoin EPA's and the Army Corps of Engineers' 2023 rule revising the definition of "waters of the United States" under the CWA. The states argued the rule violated the APA, the Commerce Clause, the Tenth Amendment, the Due Process Clause, a...

The Hawaii Supreme Court affirmed the Public Utility Commission's (PUC's) decision denying an energy company's request to supply energy to Hawaii Island using a biomass power plant. The company appealed, arguing the PUC misunderstood its mandate and held it to an unfair standard. The court disagreed...

A district court granted Texas' and Idaho's motion to preliminarily enjoin EPA's and the Army Corps of Engineers' 2023 rule revising the definition of "waters of the United States" under the CWA. The states sought to enjoin the rule within their borders, arguing it was unconstitutional and violated ...

A district court denied for lack of jurisdiction the Commonwealth of Kentucky's and business groups' motions to preliminarily enjoin EPA's and the Army Corps of Engineers' 2023 rule revising the definition of "waters of the United States" under the CWA. The court found that plaintiffs failed to show...

The Eighth Circuit affirmed a district court ruling granting the state of Minnesota's motion to remand to state court a climate liability lawsuit alleging that fossil fuel producers fraudulently marketed their products and misinformed customers about the dangers of fossil fuel use. Minnesota sued th...