Southland Holdings, Inc. (NYSE:SLND) ("Southland") announced today that Red River Biosolids Partners, a joint venture comprised of Aecon, MWH Constructors, and Oscar Renda Contracting of Canada, a Southland subsidiary, in which each partner holds a 33.3% interest, has completed the collaborative development phase and has been awarded an approximately $815 million CAD contract by the City of Winnipeg for the North End Water Pollution Control Centre ("NEWPCC") Sewage Treatment Plant Upgrade – Biosolids Facilities progressive design-build project in Manitoba. Stantec is providing design services. Southland’s share of the contract value, approximately $272 million CAD, will be added to its Civil segment backlog in the third quarter of 2026.

During the development phase, Red River Biosolids Partners advanced design and cost elements of the project. The construction phase will now begin to deliver new biosolids facilities and modifications to the existing facilities. Upgraded facilities operations are expected to commence in the fourth quarter of 2030, with final construction completion anticipated in the second quarter of 2031.

The plant is Winnipeg’s largest and oldest wastewater treatment facility, responsible for treating 70% of the city’s wastewater and all biosolids. The upgrades will help meet environmental regulations, protect waterways, and expand water treatment capacity, while supporting employment and economic growth.