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Armstrong CSO Master Plan projects

We are changing the existing combined sewer system to:

  • Reduce the risk of basement flooding
  • Reduce combined sewer overflows
  • Increase wastewater capacity for future land development/infill housing

Construction on Contract 1 will begin in 2026. This work will include construction of new wastewater sewers. It will involve excavating the roads to install the new sewer pipes. The new pipes will allow us to separate land drainage (rainfall and snowmelt) from wastewater in the existing combined sewer.

This work is part of the Combined Sewer Overflow (CSO) Master Plan. There will be at least eight contracts over the next five years to finish the CSO Master Plan work in the Armstrong Sewer District.

Some of this future work includes green infrastructure solutions like:

  • A bioretention facility located north of Leila Avenue and east of McGregor Street
    • A bioretention facility treats stormwater by allowing runoff to move through engineered soils and vegetation. From there, the runoff will flow back to the land drainage system. The goal is to create an attractive landscape feature that treats stormwater.
  • Soil storage and rain gardens along Leila Avenue between McPhillips Street and Garden Park Drive
    • These features help capture rainwater, while reducing the strain on the sewer system during heavy rain.

Residents who live in the Mynarski and Old Kildonan wards can find out more about current traffic impacts here.

You can learn more about the work planned in the “Contracts” tab below.

No. Start date Completion Estimated cost Scope of work
1 2026 2028 $26.5 million Construction of new wastewater sewers on on McPhillips St., Leila Ave., McGregor St., Aikins St., Armstrong Ave., and Main St.

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