Municipal Class Environmental Assessment Study
Mid-Halton Wastewater Treatment Plant Expansion

About the study

Halton Region is initiating a Municipal Class Environmental Assessment (MCEA) Study for the expansion of the Mid-Halton Wastewater Treatment Plant, as identified in the 2011 Sustainable Halton Water and Wastewater Master Plan.

To meet future demands and support growth into 2031, this study will identify and evaluate options to increase the capacity of the existing facility from 125 million litres per day (ML/d) to 175 ML/d.

Process and consultation

The study will be carried out in accordance with Schedule C of the Municipal Class Environmental Assessment (October 2000, as amended 2007, 2011, 2015 and 2023), which is an approved process under the Ontario Environmental Assessment Act.

A key part of the study is consultation with the public and review agencies through Public Information Centres (PICs). The purpose of this PIC is to introduce the project and provide background information as well as review and gather input on the key issues to be considered in the evaluation of options for the capacity upgrades. The next steps and anticipated timeline for completion of the study will also be provided.

Upon completion of the study, an Environmental Study Report will be prepared, finalized, and made publicly available for review and comment for a minimum of 30 days.

We want to hear from you!

Anyone with an interest in this study is invited to participate in our online PIC:

• Consultation period: June 26 to July 25, 2025
• Learn about the study: Visit the project consultation webpage
• Submit your comments by July 25: Take our online survey

If you have any questions, would like to discuss the project, or would like to be added to the project mailing list, please contact a member of the project team: