Black Creek Sanitary Trunk Sewer - Phase 1

The Black Creek Sanitary Trunk Sewer (Phase 1) project, located in Toronto, Ontario, is a major infrastructure initiative designed to expand wastewater servicing capacity in the Black Creek sewershed. Phase 1 includes the construction of the Keele Relief Trunk Sewer (12.9 km), Jane Relief Sewer (3.9 km), five flow diversion structures, real-time monitoring and control systems, and a Combined Sewer Overflow (CSO) Storage Tunnel (0.5 km). These upgrades will form a "twinned" trunk sewer system with the existing Black Creek Sanitary Trunk Sewer, improving conveyance and reducing overflow events. Planning is underway, with construction scheduled from December 2026 to September 2031. The project will enable an estimated 60,500 additional housing units and support population growth of 130,400 residents and 65,700 jobs, particularly in the Downsview area. Outcomes include enhanced wastewater capacity, reduced flooding and CSO events, and support for long-term housing and employment growth beyond 2051. This initiative is critical to Toronto's urban intensification strategy and aligns with the city's Official Plan and Housing Action Plan.

A small component of the project (measuring 912.58 m) is occuring on federal land in Downsview Park. 

  • The section of the project occurring on Downsview Park is located on the north western section of Downsview Park.
  • The project area is situated within a highly modified urban environment and included a permanent engineered surface waterbody (lake).
  • The project area appears to have been previously disturbed.
  • The location consists of landscaped vegetation and roughly 7 m from a stormwater pond within Downsview Park. 

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Latest update

Housing Infrastructure Communities Canada must determine whether the proposed Black Creek Sanitary Trunk Sewer - Phase 1 is likely to cause significant adverse environmental effects.

To help inform this determination, Housing Infrastructure Communities Canada is inviting comments from the public respecting that determination. All comments will be considered public. For more information, individuals should consult the Privacy Notice on the Registry website (https://iaac-aeic.gc.ca/050/evaluations/Protection?culture=en-CA).

Participate

Key documents

Key documents
Document number Document title File Date
2 Notice of Intent to Make a Determination - March 30, 2026

Contacts

Heather Rock
Housing Infrastructure and Communities Canada
Heather Rock, Senior Environmental Review and Approval Officer
180 Kent Street
Ottawa, Ontario K1P 0B6
Telephone: 782-640-4880
Email: Heather.Rock@infc.gc.ca


Disclaimer

This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.

  • Location

    • Toronto (Ontario)

  • Nature of Activity

    • Waste Management

  • Assessment Status

    In progress

  • Start Date

    2026-03-30

  • Proponent

    City of Toronto

  • Authorities

    • Infrastructure Canada

  • Assessment Type

    Project on federal lands

  • Reference Number

    90208

Nearby assessments

...within 200 kilometres
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