To identify the preferred upgrades for the Mid-Halton Wastewater Treatment Plant (WWTP) that will increase treatment capacity from 125 million litres per day (ML/d) to 175 ML/d to service and support growth by 2031.

During this study, the project team will:

• review options to upgrade the WWTP to service growth;
• evaluate alternative concepts for achieving the required wastewater treatment capacity;
• assess the impacts and identify mitigation measures;
• consult the public and review agencies; and
• prepare the Environmental Study Report for review and approval.

This study will be carried out in accordance with Schedule C of the Municipal Class Environmental Assessment (MCEA), (October 2000, as amended 2007, 2011, 2015, 2023 and 2024), which is an approved process under the Ontario Environmental Assessment Act.

Public Information Centre #1

An online Public Information Centre took place between June 26 and July 25, 2025. To learn about the study findings so far, please visit the project consultation page.

Project Documents

Notice of Study Commencement and Public Information Centre #1