Region of Peel East to West Wastewater Diversion Project

The Region of Peel is constructing the East to West Diversion Sanitary Trunk Sewer, a 2400 mm diameter trunk sewer, within the City of Mississauga. It spans 11 km travelling along Derry Road, Old Derry Road, Old Creditview Road, and Creditview Road starting east of Bramalea Road and ending at Argentia Road. The trunk sewer will connect the Region's East Trunk Sanitary System to the West Trunk Sanitary System with the purpose of balancing the Region's sanitary collection system and wastewater plants' demand to accommodate planned future growth in the Region of Peel

There will be a total of seven tunnel access shafts located along the sewer route to facilitate the planned Tunnel Boring Machine (TBM) work. MH1 connection shaft at the west side of Spring Creek north of Derry Road will connect to the existing 1650mm diameter and 1200mm diameter trunk sewers. This location is on airport property and therefore only this location will be assessed under the Impact Assessment Act.



Latest update

April 6, 2023 – The public comment period on the project is closed. The GreaterToronto Airports Authority (GTAA) is considering comments received to help inform its determination on whether the carrying out of the project is likely to cause significant adverse environmental effects.



Greater Toronto Airports Authority (GTAA)
Environmental Services
3111 Convair Drive
Toronto, Ontario L5P 1B2

  • Location

    • Toronto Pearson International Airport (Ontario)
  • Nature of Activity

    • Airport and Airfields
    • Other, not otherwise specified
  • Assessment Status

    In progress
  • Start Date

  • Proponent

    Region of Peel
  • Authorities

    • Greater Toronto Airports Authority
  • Assessment Type

    Project on federal lands
  • Reference Number


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.


Nearby assessments

...within 200 kilometres
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