(Cheyenne, Wyo.) – The State of Wyoming today formally filed in the 10th Circuit Court of Appeals a Petition for Review of the Environmental Protection Agency’s action regarding Treatment as State for the Wind River Indian Reservation.

The filing of the appeal follows yesterday’s decision by the EPA to put a stay on the implementation of its ruling, at the request of the both the Northern Arapaho and Eastern Shoshone Tribes and the State.

At issue particularly for the state is the EPA’s designation of the boundaries of the Wind River Indian Reservation to include Riverton.

“I firmly believe that a decision of this significance should not come from a regulatory agency, especially when it goes against over 100 years of history, law and practice. Those facts are why we had to challenge this in the courts and ask the agency to reconsider its decision,” Governor Mead said in a statement. “We received good news yesterday when the EPA stayed its decision. The action creates some certainty while we wait for the agency to reconsider its position during a judicial review of this flawed decision.”

Petitions to the court for review are required to be complete by Feb. 18. Click this link to see the Petition for Review. Read more background on the situation here.