The U.S. Environmental Protection Agency was one of the first federal agencies with a formal policy specifying how it would interact with tribal governments and consider tribal interests in carrying out its programs to protect human health and the environment. The EPA Policy for the Administration of Environmental Programs on Indian Reservations, signed in 1984, remains the cornerstone for EPA’s Indian program. 

• EPA Policy for the Administration of Environmental Programs on Indian Reservations (PDF)(4 pp, 249 K, Nov 8, 1984)
• Administrator Pruitt's Reaffirmation of the EPA's 1984 Indian Policy (PDF)(2 pp, 4 MB, October 11, 2017)