Stoney Nation Big Horn Wastewater System

The community of Big Horn #144A is located approximately 120km west of Rocky Mountain House. It is a part of Stoney Nation, which is comprised of the Bearspaw, Chiniki and Wesley First Nations. The Big Horn wastewater system consists of septic tanks and septic fields. Rural residential properties are serviced by an individual sewage disposal system at each location. A Water and Wastewater System Assessment report completed by BCL Engineering Ltd. in 2020 identified 42 existing residences' septic tanks and septic fields are at the end of their serviceable life and will require replacement. The walls of the septic tanks have failed/corroded through and multiple tank lids are cracked and unstable in place. Several systems will require full replacement of all components. In addition to the 42 existing residences, an additional 8 septic tanks and fields are required immediately for new housing scheduled for construction. Private sewage systems will be designed per the Alberta Private Sewage Systems Standard of Practice. This project serves to improve sanitation conditions within Big Horn #144 while minimizing new areas of disturbance and adverse effects on the community. Construction is anticipated take place from May to September 2023.

Latest update

November 30, 2022 – Indigenous Services Canada issued its notice of determination Notice of Determination for the Stoney Nation Big Horn Wastewater System ( and determined that the project is not likely to cause significant adverse environmental effects.


Key documents

Key documents
Document Number Document Title File Date
2 Notice of Determination for the Stoney Nation Big Horn Wastewater System - November 30, 2022
1 Public Comment Period on Intent to Make a Determination - October 17, 2022


Janelle Charland
Lands and Economic Development
Indigenous Services, Environment Officer
630 Canada Place, 9700 Jasper Ave
Edmonton, Alberta T5J 4G2
Telephone: 780-288-4348

  • Location

    • Big Horn No. 144A (Alberta)
  • Nature of Activity

    • Water Management
    • Waste Management
  • Assessment Status

    In progress
  • Start Date

  • Proponent

    Stoney First Nation
  • Authorities

    • Indigenous Services Canada
  • Assessment Type

    Project on federal lands
  • Reference Number


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.


Nearby assessments

...within 200 kilometres
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