York Region Sewage Works Project
The Regional Municipalities of York and Durham are working together to carry out the York Region Sewage Works Project, a long-term wastewater infrastructure project across the Towns of East Gwillimbury, Newmarket, Aurora, Ajax and the Cities of Richmond Hill, Markham and Pickering.
As required by the Supporting Growth and Housing in York and Durham Regions Act, 2022, the York Region Sewage Works Project will increase the existing York Durham Sewage System, including new or expanded wastewater sewers, pumping stations and enhancements to the Duffin Creek Water Pollution Control Plant on the shore of Lake Ontario in the City of Pickering. Durham Region supports proposed work in the City of Pickering as part of the project.
About the project
Project Updates
- Public Notice - October 17, 2024
- Notice of Field Studies – September 20, 2024
- Public Notice – November 3, 2023
- Public Notice – July 20, 2023
Project Report
York Region and Durham Region submitted the York Region Sewage Works Project Report outlining infrastructure components and costs, impacts to the environment and how those impacts will be mitigated to the Minister of the Environment, Conservation and Parks, in accordance with the Act.
- Cover Page and Table of Contents
- Chapter 1 Introduction and Background
- Chapter 2 Confirmation and Description of Components
- Chapter 3 Design Basis
- Chapter 4 Infrastructure Located in East Gwillimbury
- Chapter 5 Infrastructure Located in Newmarket and Aurora
- Chapter 6 Leslie Street Trunk Sewer and Yonge Street Sewer Rehabilitation
- Chapter 7 Markham Collector Twinning
- Chapter 8 Primary Trunk Twinning
- Chapter 9 Duffin Creek Water Pollution Control Plant Expansion and Upgrades
- Chapter 10 Duffin Creek Water Pollution Control Plant New Outfall
- Chapter 11 Implementation Plan
- Chapter 12 Conclusion
- Appendix A Chapter 4 Drawings
- Appendix B Chapter 5 Drawings
- Appendix C Chapter 6 Drawings, CI-D019 – CI-D021
- Appendix C Chapter 6 Drawings, CI-D022 – CI-D024
- Appendix D Chapter 7 Drawings
- Appendix E Chapter 8 Drawings
Project Maps
York Region Sewage Works Project map showing the north York Durham Sewage System Expansion (YDSS)
York Region Sewage Works Project map showing the south York Durham Sewage System Expansion (YDSS)
York Region Sewage Works Project map showing the primary system expansion of the York Durham Sewage System (YDSS)
Accessible formats or communication supports are available upon request.
Supporting Growth and Housing in York and Durham Regions Act, 2022
On November 28, 2022, the Ontario government passed the Supporting Growth and Housing in York and Durham Regions Act, 2022.
The Act mandated York Region change from the previously proposed Lake Simcoe watershed solution, also known as Upper York Sewage Solutions, to a Lake Ontario solution that will direct, transport and treat wastewater at the Duffin Creek Water Pollution Control Plant in Durham Region.
The Act required:
- York and Durham Regions to prepare reports outlining infrastructure components, potential impacts to the environment and engagement with Indigenous communities and the public. Three reports were prepared, a Project Report and two Consultation Reports
- Project and Consultation Reports were shared for public review on November 6, 2023 and submitted to the Ministry of the Environment, Conservation and Parks on March 15, 2024
- Minister of the Environment, Conservation and Parks confirmed York and Durham Regions satisfied the conditions of the Act and can proceed with implementing the project
Infrastructure components in the Project Report are exempt from the Environmental Assessment Act because the Province established a separate review process for this project under the Act.
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