Mni Waste’ Water Company (MWWC) Water Supply

Mni Waste’ Water Company (MWWC) Water Supply


Cheyenne River Sioux Tribe - Eagle Butte, SD

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The Mni Waste Water Company is a Tribally-chartered entity formerly known as the Tri-County Water Association (TCWA), located primarily on the Cheyenne River Indian Reservation. Banner has been providing planning, reporting, and design services since 1994 for improvements and distribution system expansion on the Cheyenne River Indian Reservation and surrounding areas. The first phase of improvements is the MWWC Water Supply Project which includes a 4.4 million gallons per day (MGD) Water Treatment Plant (WTP) and a 35-mile water pipeline from the Oahe Intake to Eagle Butte. An Environmental Report was prepared in conjunction with the Preliminary Engineering Report, and a FONSI (Finding of No Significant Impact) was issued by USDA Rural Development for the 35-mile water pipeline from the Missouri River Oahe Intake to Eagle Butte and Water Treatment Plant.  A 10-mile segment of 30"-diameter raw water pipeline has been completed and the construction of the 4.4 MGD WTP is under construction.  Also currently under construction is the first 12-mile segment of 24"-diameter Treated Water Pipeline with an additional 13-mile segment planned in later phases. After completion of the new Water Treatment Plant, raw water pipeline, and treated water pipelines, implementation of overall project as recommended (including distribution and storage system improvements and expansion) is expected to exceed $350 million. As part of that distribution phase, a two-million gallon elevated reservoir for Eagle Butte is planned, as are five miles of 24"- and 16"-diameter water mains to connect the first phase to the Indian Health Service complex and water tower on the south side of Eagle Butte. 

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Project Goal #1

To provide an adequate and reliable water supply for the entire Cheyenne River Indian Reservation and surrounding areas is western Meade County and southeastern Perkins County

Project Features

  • Approximately 10 miles of 30" diameter Raw Water Pipeline (RWP)
  • New 4.4 MGD Water Treatment Plant (WTP)
  • Approximately 25 miles of 24" diameter Treated Water Pipeline (TWP)
  • New 2 MG elevated water reservoir - composite construction approximately 1' in height
  • Approximately 5 miles of 24" and 16" diameter distribution water main improvements

Services Provided

  • Needs Assessment, Technical and Feasibility Reports
  • Preliminary Engineering Report
  • Topographic/Legal Surveys
  • Preliminary/Final Design
  • Construction Documents
  • Bidding Services
  • Construction Contract Administration
  • Construction Staking and Observation

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