Southland JV Awarded the Winnipeg North End Treatment Plant Upgrade - Biosolids Facilities Progressive Design - Build Project

GRAPEVINE, Texas--(BUSINESS WIRE)--Southland Holdings, Inc. (NYSE American: SLND and SLND WS) (“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.

Further information about the project is available on the City of Winnipeg’s website.

About Southland

Southland is a leading provider of specialized infrastructure construction services. With roots dating back to 1900, Southland and its subsidiaries form one of the largest infrastructure construction companies in North America, with experience throughout the world. The company serves the bridges, tunneling, communications, data centers, transportation and facilities, marine, steel structures, water and wastewater treatment, and water pipeline end markets. Southland is headquartered in Grapevine, Texas. For more information, please visit Southland’s website at www.southlandholdings.com.

About Red River Biosolids Partners

Red River Biosolids Partners is a joint venture comprised of Aecon Group Inc. (TSX: ARE) (“Aecon”), MWH Constructors Canada Ltd. (“MWH Constructors”), and Oscar Renda Contracting of Canada Inc., a Southland subsidiary, in which each partner holds a 33.3% interest.

Forward-Looking Statements

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