The following four Tribes are members of Great Plains Tribal Water Alliance (GPTWA)
• Flandreau Santee Sioux Tribe
• Oglala Sioux Tribe
• Rosebud Sioux Tribe
• Standing Rock Sioux Tribe
Membership is open to all Tribes in the Great Plains Region. Other Tribes participating: Sisseton Wahpeton Oyate and Cheyenne River Sioux Tribe.
For membership details please contact Doug Crow Ghost firstname.lastname@example.org