- Main Office Hours: Monday - Friday 8:00 am to 4:30 pm mst
- Main Office Phone: (605) 964-7766
- Treatment Plant Hours: 7:00 am to 3:00 pm mst
- Treatment Plant Phone: (605) 733-2206
- Treament Plant Address: 17187 261st Ave. Armstrong SD 57625 (11.5 miles on Hwy 212 east, 5 miles on BIA Route 19 South, 5.5 Miles on BIA Route 8 East and 1.4 miles South on the gravel to the treatment plant)
Mni Wašté Water Company
228 East Prairie Rd.
Eagle Butte, SD 57625
