Current status

You can comment on the environmental assessment for this project until 5:00 p.m. on August 14, 2026.

Learn how to submit your comments.

Project summary

Waste Management of Canada Corporation (Waste Management) is looking to expand the Twin Creeks Environmental Centre landfill to provide up to an additional 14.3 million cubic metres of waste capacity on the existing site, which would extend the life of the site by approximately 12 years. This proposed expansion would be achieved through a vertical expansion and would not change the approved service area or annual fill rate of the existing site.

Waste Management has owned and operated the landfill, located in the Township of Warwick, since 1996. The landfill is authorized to receive up to 1.4 million tonnes per year of municipal, industrial, commercial, and institutional non-hazardous solid waste, including non-hazardous contaminated soil from across Ontario.

Learn more on the Twin Creeks Environmental Centre website.

Proponent

Waste Management of Canada Corporation

Location

Township of Warwick

Project type

Waste management

Reference number

18022

Contact

Stephen Deneault, Environmental Assessment Branch

Project history

Environmental assessment: submitted
Date submitted: June 26, 2026
Expiry of public comment period: August 14, 2026

Terms of reference (amended): approved
Date submitted: January 7, 2022
Date amended terms of reference submitted: March 30, 2022
Decision date: December 13, 2022

Environmental assessment

Waste Management has submitted its environmental assessment for the Twin Creeks Environmental Centre landfill optimization project to the Ministry of the Environment, Conservation and Parks for review. This assessment evaluated alternative expansion configurations, and the preferred vertical expansion was selected through a comparative analysis of the alternative methods identified in the amended terms of reference, which reflected feedback through public consultation.

Submit a comment

Members of the public, agencies, Indigenous communities and other interested persons are encouraged to actively participate in the environmental assessment process.

Read the notice of submission to learn how to review the environmental assessment and submit your comments.

Terms of reference

Waste Management submitted the terms of reference for the Twin Creeks Environmental Centre landfill optimization project environmental assessment to the Ministry of the Environment, Conservation and Parks on January 7, 2022. A 30-day public, agency and Indigenous community comment period occurred from January 7, 2022, to February 6, 2022. Concerns raised during the comment period were addressed and Waste Management submitted an amended terms of reference to the ministry on March 30, 2022.

On December 13, 2022, the Minister of the Environment, Conservation and Parks approved the amended terms of reference under the Environmental Assessment Act for this project.
The terms of reference serves as a framework for the preparation and review of an environmental assessment. It outlines what studies will be completed, how alternatives will be evaluated and selected, and how consultation will be undertaken.

The terms of reference outlines a consultation program to be implemented during the preparation of the environmental assessment to engage the public, Indigenous communities, government agencies and other interested parties in the environmental assessment  process. Input will be obtained through a number of consultation activities, and the proponent will also maintain a project website.

Notice of approval—terms of reference

Environmental Assessment Act subsection 6(4) approval of terms of reference for the preparation of an environmental assessment

Proponent: Waste Management of Canada Corporation
Terms of Reference: Twin Creeks Environmental Centre Optimization Project Environmental Assessment
Undertaking: Landfill capacity expansion
EA File Number: 03-08-02

As provided for by subsection 6(4) of the Environmental Assessment Act, Terms of Reference, as submitted for approval to the Ministry of the Environment, Conservation and Parks on January 7, 2022, and revised through the submission of an amended Terms of Reference dated March 30, 2022, is hereby approved.

Pursuant to subsection 6.1(1) of the Environmental Assessment Act, any environmental assessment for the above-noted undertaking, submitted to the Ministry of the Environment, Conservation and Parks pursuant to subsection 6(2)(c) of the Act, must be prepared in accordance with the Terms of Reference as hereby approved.

Reasons

I am satisfied that an environmental assessment prepared in accordance with the amended Terms of Reference will be consistent with the purpose of the Environmental Assessment Act and the public interest for the following reasons:

  1. The amended Terms of Reference ensure that the environmental assessment will be completed using a comprehensive government agency, Indigenous Community and public consultation process that is open and transparent;
  2. The amended Terms of Reference provides an acceptable level of detail to confirm that the environmental assessment will provide sufficient information to accurately assess the environmental effects of the preferred undertaking and all alternatives;
  3. The amended Terms of Reference sets out a planning process that will ensure that the completed environmental assessment will be consistent with the purpose of the act and the public interest; and,
  4. There are no outstanding issues that have not been addressed in the amended Terms of Reference or cannot be addressed during the preparation of the environmental assessment.

Dated the 13th day of December, 2022 at Toronto.
Original signed by:
Minister of the Environment, Conservation and Parks
777 Bay Street, 5th Floor
Toronto, Ontario
M7A 2J3