10/09/2026
The Standing Rock Sioux Tribe has filed a new federal lawsuit against the U.S. Army Corps of Engineers and PHMSA, continuing its decade-long fight to protect Lake Oahe, its sole source of drinking water, from the Dakota Access Pipeline (DAPL).
The Tribe challenges federal actions allowing DAPL to continue operating beneath Lake Oahe, less than half a mile upstream from the Standing Rock Reservation.
After six years of environmental review, the Army Corps issued a Final Environmental Impact Statement in December 2025 and Record of Decision authorizing a new 25-year easement in May 2026. Yet the Corps has failed to adequately address serious concerns including pipeline safety, emergency spill response, cultural resources, and Treaty rights.
The stakes have only grown. The ROD authorizes an increase from DAPL’s original capacity of 574,000 to 1.1 million barrels of oil per day, nearly twice its original capacity through the same infrastructure.
The new lawsuit raises claims under the National Historic Preservation Act, including Sections 106 and 110(k), NAGPRA, NEPA, the Clean Water Act, the Mineral Leasing Act, and the Administrative Procedure Act. These laws impose distinct obligations on federal agencies concerning environmental protection, cultural preservation, consultation, and lawful decision-making.
Ten years after the struggle to protect the water first began, the Tribe continues to defend its water, sovereignty, and future generations. A new chapter begins in that battle.
Standing Rock is represented by the law firms of Jeff Parsons, Peter Caposella, and Natali Segovia of the Water Protector Legal Collective.
Mni Wiconi. Water is Life.