Authority to Administer Standards Program

These tribes were granted treatment in a manner similar to a state (TAS) on August 29, 1996.  

Tribe Standards in Effect for CWA Purposes

The Tribes’ initial water quality standards were approved on April 25, 2000. The Tribes' water quality standards are applicable to "waters of the Tribe". In some limited instances, the definition adopted by the Assiniboine and Sioux Tribes for "waters of the Tribe" as part of their water quality standards may result in water quality standards that are more comprehensive than required under section 303(c) of the Clean Water Act and the implementing federal regulations. EPA has included the Assiniboine and Sioux Tribes' water quality standards in their entirety here for context and as supplementary information for the reader.  

• [See Assiniboine and Sioux Tribes of the Fort Peck Indian Reservation (PDF)]
  (Effective June 4, 2018)
  Please note that not all parts of this document are effective for CWA purposes. See cover page for more detailed information.

Federally Proposed or Promulgated Standards

At this time, there are no federally proposed or promulgated standards applicable to this tribe.

• Assiniboine and Sioux Tribes of the Fort Peck Indian Reservation (PDF)(122 pp, 43 MB)