The Ninth Circuit, 2-1, denied a municipal irrigation district's request to compel a district court to remand to state court its motion for preliminary injunction in a suit concerning water…

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 New Mexico Supreme Court overturned regulations promulgated by the State Game Commission in 2017 that outlined a process for landowners to obtain a certificate allowing them to close public…

The Nevada Supreme Court held, 4-3, that the state's top water official had authority to approve a groundwater management plan (GMP) that deviated from the doctrine of prior appropriation for the…

The U.S. Supreme Court dismissed a lawsuit brought by Mississippi against Tennessee seeking damages for a Tennessee city's pumping of groundwater from the Middle Claiborne Aquifer. Mississippi…

A district court granted in part and denied in part gasoline companies' motion for summary judgment in a lawsuit brought by the state of Maryland seeking to redress alleged contamination of its…

The Ninth Circuit reversed a district court's dismissal of a Native American tribe's breach of trust claim in a lawsuit concerning water rights to the Colorado River. The tribe initially sued DOI…

The U.S. Supreme Court, in an ongoing dispute between Florida and Georgia over the apportionment of the Apalachicola-Chattahoochee-Flint River Basin's waters, agreed unanimously with a special…

The U.S. Supreme Court denied certiorari in a lawsuit concerning President Barack Obama's 2016 proclamation of the Northeast Canyons and Seamounts National Marine Monument off the New England…

The D.C. Circuit affirmed dismissal of a lawsuit concerning reserved water rights in the Klamath River Basin. Ranchers sued to prevent Native American tribes from exercising reserved water rights…