Mosquito First Nation Lagoon Upgrades

The Proposed Project

The Project includes the expansion of an existing lagoon, as it is currently too small for its design population. The new lagoon is expected to have a 220-day storage capacity and a 20-year design life. Treatment cells will require an expansion of 19,100m2 in surface area and storage cells will require an expansion of 77,000m3 in volume. Lagoon design was determined in accordance to the current Indigenous Services Canada and Water Security Agency sizing requirements. Compacted clay liners will be used to keep lagoon seepage to a minimum and protect surrounding land and groundwater. Berms between lagoon cells will be constructed with a top width of at least 10 feet to accommodate maintenance vehicle access.

Project involves expanding the existing wastewater lagoon by construction new cells. The existing force main will also be extended.

Lagoon Construction 
- strip and stockpile topsoil. 
- excavate and stockpile medium plastic clay 
- construct berms.
- excavate subgrade soil.
- form positive seal between berm fill and undisturbed soil 
- install clay liner 
- replace topsoil and seed areas where needed

Minimal construction waste will be generated, which will be deposited in a licensed nearby facility. Desludging activities will be carried out and sludge will be dried on site. No hazardous waste is expected to be generated by this project. Clearing is planned to occur in the winter to lessen potential impacts to nesting birds.


Latest update

February 8, 2022 - Indigenous Services Canada issued its notice of determination Notice of Determination for Mosquito First Nation Lagoon Upgrades - ( 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 Mosquito First Nation Lagoon Upgrades - February 8, 2022
1 Public Comment Period on Intent to Make a Determination - December 22, 2021


Indigenous Services Canada
Alvin Hamilton Building, 1783 Hamilton Street
Regina, Saskatchewan S4P 2B6
Telephone: 306-581-3134

  • Location

    • Mosquito First Nation (Saskatchewan)
  • Nature of Activity

    • Water Management
    • Waste Management
  • Assessment Status

  • Start Date

  • Proponent

    Mosquito 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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