At Mni Wašté Water Company, our goal is to provide safe and clean water to all of our residents! The Mni Wašté Water Company is a tribally chartered entity with the Cheyenne River Sioux Tribe and serves 14,000 members in the Dewey, Western Meade and Southeastern Perkins Counties on the Cheyenne River Lakota Reservation in South Dakota.
- Main Office Hours: Monday - Friday 8:00 am to 4:30 pm mst
- Main Office Phone: (605) 964-7766
- Treatment Plant Hours: 7 days a week 7:00 am to 3:00 pm mst
- Treatment Plant Phone: (605) 733-2206
