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Sarnia, Ontario, launches combined sewer separation to strengthen wastewater system resilience

  • Sarnia, Ontario, launches combined sewer separation to strengthen wastewater system resilience
    Sarnia, located at the mouth of the St. Clair River on the shores of Lake Huron.
    Credit: The Corporation of the City of Sarnia

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Canada’s federal government and the City of Sarnia (Ontario) are investing over CAD 29.5 million (more than USD 20 million) in the Cromwell Area Sewer Separation and Flood Mitigation Project, a major infrastructure initiative aimed at addressing the increasing risk of basement flooding and sewer overflows due to more frequent and intense storms. This upgrade will replace the combined sewers with separate storm and sanitary sewers, enhance the wastewater collection system, replace the water main, and fully repave sidewalks and roads. These improvements will help reduce economic losses and protect the community from future flooding disruptions.

Announced by the Honourable Nathaniel Erskine-Smith, Minister of Housing, Infrastructure and Communities, alongside Sarnia Mayor Mike Bradley, the project includes a close to CAD 12 million investment from the federal government through the Disaster Mitigation and Adaptation Fund (DMAF), while the City of Sarnia is contributing close to CAD 18 million. Minister Erskine-Smith emphasized the importance of this initiative, stating, “Investing in infrastructure like Sarnia’s sewer upgrade isn’t just about fixing pipes—it’s about protecting homes, strengthening communities, and making sure we’re ready for the challenges ahead.”

David Jackson, Engineering and Operations General Manager for the City of Sarnia, underscored the project’s role in enhancing climate resilience and supporting future growth. “Support like this for combined sewer separation will go a long way toward building a more resilient wastewater system that mitigates the negative impacts of extreme weather events such as basement flooding. Projects like these are a key piece of our Climate Action Plan and work to mitigate flooding in our community, while at the same time expand sanitary sewer capacity for new development.”

Since 2018, the federal government has committed over CAD 3.8 billion to the DMAF, supporting more than 80 infrastructure projects across Canada aimed at strengthening communities against natural disasters. Research shows that every dollar spent on climate adaptation can yield CAD 13 to CAD 15 in benefits, making investments like the Cromwell Area Sewer Separation and Flood Mitigation Project critical to long-term economic and environmental sustainability. By modernizing its wastewater infrastructure, Sarnia is taking a proactive step toward a more resilient and prepared future.

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