The U.S. Supreme Court held, 5-4, that the CWA does not authorize EPA to include "end-result" provisions in NPDES permits, in a lawsuit concerning the Agency's issuance of a renewal permit for the city of San Francisco that added two such requirements.

In an unpublished opinion, the Ninth Circuit affirmed in part and reversed in part a district court ruling in a lawsuit over a logging project in Kootenai National Forest.

The Tenth Circuit denied environmental groups' petition to review an EPA rule that partially approved Colorado's SIP to reduce ozone pollution.

A district court vacated a 2022 instruction memorandum (IM) issued by BLM that outlined policies and procedures for administering an incentive program for adopting federally protected wild horses and burros.

A district court granted in part and denied in part summary judgment for an environmental group in a challenge to NMFS' denial of the group's petition to promulgate ESA §4(d) regulations for 20 coral species.