Winchester 

Lagoon 

Upgrades

About the Project

Our team recently completed the Winchester Lagoon Sewage Treatment Plant Upgrades for the Township of North Dundas, delivering the full scope of work as general contractor.

The project increased wastewater treatment capacity while significantly reducing ammonia levels in water discharged into the South Nation River. The upgrades will support Winchester’s continued growth while helping protect an important local waterway.

What We Delivered

As general contractor, our team managed every element of the project from start to finish. The scope included removing sludge from existing lagoon cells, upgrading wastewater piping systems, installing new electrical control panels, supplying and commissioning effluent pumps, and constructing a new pump station.

The work also brought together expertise from across our sewer and water, roadway, concrete and shoring teams. Coordinating these capabilities through one integrated team helped keep a complex infrastructure project moving efficiently from construction through commissioning.

Innovation

At the heart of the upgrades is a patented Submerged Attached Growth Reactor (SAGR) system supplied by Nexom.

The new SAGR cells are filled with washed clearstone and equipped with aeration leads. As wastewater flows through the cells, air supports the growth of microorganisms that naturally break down contaminants and reduce ammonia levels.

The system gives the Township a reliable treatment process designed to meet strict environmental standards while supporting the additional capacity Winchester needs as the community grows.

Impact

With construction complete, the upgraded lagoon cells are now developing the biological conditions required for full treatment performance. Once fully operational, the system will reduce ammonia discharge, help protect the South Nation River and provide additional wastewater treatment capacity to support future growth in Winchester.

The project demonstrates what our teams can accomplish when multiple areas of expertise work together—from civil construction and wastewater servicing to concrete and shoring. The result is infrastructure designed to serve the community and protect the surrounding environment for decades to come.