In an unpublished opinion, the Ninth Circuit vacated a district court finding that adding fluoride to drinking water at a concentration of 0.7 milligrams per liter (mg/L) presented an unreasonable…

The Fifth Circuit, 2-1, reversed in part and affirmed in part a district court ruling in a lawsuit concerning lead in Jackson, Mississippi's drinking water. Representatives of residents of the…

A district court granted EPA's motion to dismiss a challenge to its 2022 denial of a coal-fired power plant's request to extend the deadline to comply with an amendment to the Agency's 2015…

A district court denied summary judgment for environmental groups in a challenge to the Bureau of Reclamation's application of provisions of the Water Infrastructure Improvements for the Nation (…

A district court vacated its preliminary injunction in an environmental groups' challenge to the Army Corps of Engineers' issuance of a dredge-and-fill permit for a dam expansion project in…

A district court denied USDA's motion to alter judgment in a lawsuit challenging the Natural Resources Conservation Service's (NRCS') 2020 final rule concerning pre-1996 wetland certifications. An…

The U.S. Supreme Court, 5-4, denied two states' motion to enter into a consent decree in a lawsuit concerning a 1938 interstate agreement that apportions the waters of the Rio Grande River among…

A district court granted DOI's motion to dismiss a lawsuit concerning tribal water rights on the Crow Reservation in Montana. Tribal members who hold property on the reservation challenged the…

The Tenth Circuit affirmed denial of conservation groups' claims in a lawsuit concerning the Bureau of Reclamation's decision to sign a water contract allowing the state of Utah to draw from…

The U.S. Supreme Court held, 5-4, that an 1868 peace treaty between the Navajo Nation and the United States establishing the Navajo Reservation reserved necessary water to accomplish the purpose…