A state court reversed the Maryland Department of the Environment's (MDE's) decision to reissue an NPDES general permit for animal feeding operations without limitations on the discharge…

The Tenth Circuit reversed and vacated a district court order preliminarily enjoining EPA and the Army Corps of Engineers from implementing the 2020 Navigable Waters Protection Rule (NWPR) in…

The Ninth Circuit reversed a district court order staying state law claims in a lawsuit concerning the California Water Resources Board's amendments to its water quality control plan for the…

The Montana Supreme Court reversed, 5-2, a lower court decision reversing the Montana Department of Natural Resources and Conservation's (DNRC's) issuance of a beneficial water use…

The Ninth Circuit affirmed in part and vacated in part a district court's dismissal of a county's complaint in long-standing litigation over appropriation of water in the Walker River…

The U.S. Supreme Court denied, 8-0, Texas' motion to review a river master's final determination in a long-running dispute over how Texas and New Mexico share water. Texas challenged the…

The Fourth Circuit stayed a pipeline company's use of a nationwide permit, verified by the Army Corps of Engineers, to carry out construction of the Mountain Valley Pipeline in streams and…

The Montana Supreme Court affirmed vacatur of a Montana Pollutant Discharge Elimination System (MPDES) permit issued by the Montana Department of Environmental Quality (MDEQ) for a copper and…

A district court denied mine owners' motion to dismiss a lawsuit alleging they were in violation of their NPDES permit. A conservation group and the state of Washington argued that the owners…

A district court vacated EPA's 2019 determination that found no jurisdictional waters under the CWA at a salt production complex bordering the southwestern San Francisco Bay. The Agency…