Nationwide Permit 12

Pipeline ready for construction.
Seth Perlman / Associated Press

The U.S. Fourth Circuit Court of Appeals sided with environmental groups Tuesday and threw out a major federal water crossings permit for the Mountain Valley Pipeline.

Environmental advocates said the move could significantly slow down construction through much of West Virginia and is expected to affect about 160 miles of the pipeline's route in the state.

Department of Environmental Quality Firector, David Paylor walks along a retention pond for a spring near the route of the proposed Atlantic Coast Pipeline June 6, in Bolar, Va.
Steve Helber / Associated Press

Environmental advocates asked a federal court Tuesday to review a federal permit for the 600-mile Atlantic Coast Pipeline.

Appalachian Mountain Advocates, a law firm representing a coalition of environmental and citizen groups, filed a petition with the 4th U.S. Circuit Court of Appeals.