Twinning of the Meadowvale North and Streetsville Transmission Mains
Project overview
To help make new homes available faster, Peel Region is upgrading important water and wastewater systems to support expected population growth and meet Ontario’s housing goals.
As part of this effort, we’re conducting a Schedule C - Municipal Class Environmental Assessment to explore options for building new large water pipes (called “transmission mains”) on the west side of Mississauga. These upgrades will allow greater volumes of water to be supplied to the growing population in the Region.
Project background
The two new transmission mains will run alongside already existing transmission mains as “twins”. The two transmission mains to be twinned are:
- Streetsville Transmission Main – from Herridge Pumping Station to Streetsville Reservoir
- Meadowvale North Transmission Main – from Streetsville Pumping Station to Meadowvale North Reservoir
The study area is shown in the adjacent figure.
The project team is assessing different potential routes for the new transmission mains, taking into account technical feasibility, environmental and community impacts, cost, and public feedback to determine the selected route.
The project commenced in May 2025 - Notice of Commencement
Municipal Class Environmental Assessment (MCEA)
This project follows the Municipal Class Environmental Assessment (MCEA) process, which is an approved approach under the Ontario Environmental Assessment Act (1990). The MCEA process is used across Ontario to ensure major infrastructure projects are carefully studied before construction. The process involves assessing different options, identifying possible effects on the community and environment, and determining how to reduce negative impacts.
This project has been identified as a Schedule C project, meaning it has the potential for significant environmental effects and must proceed through the full planning and documentation process. This consists of five phases:
- Phase 1: Identify the Problem or Opportunity
- Phase 2: Identify and evaluate Alternative Solutions
- Phase 3: Identify and evaluate Alternative Design Concepts for the Preferred Solution
- Phase 4: Prepare and file the Environmental Study Report (ESR) for a 30-day public review period
- Phase 5: Project Implementation
The outcome of the evaluation exercise, supporting studies, the decision-making process and public feedback will be documented in a Project File Report.
Your input is important
Public consultation is critical to the success of the project.
Three Public Information Centres (PICs) will be held in association with the first three phases of the EA, and a public review period will occur during Phase 4.
Public Information Centre (PIC) No. 1
PIC No. 1 will be held in person and will present the study’s problem/opportunity statement, existing study area conditions, short-listed routes and ask for public input.
- Date and time: Thursday, December 4, 2025 from 5 p.m. to 7 p.m.
- Location: River Grove Community Centre - 5800 River Grove Ave, Mississauga, ON L5M 4R8
- Notice of PIC No.1
Contact us
Contact a member of the Project team to provide comments, ask questions, receive further information, or to be added to the Study’s contact list to receive future notifications directly:
Gareth Clemens
Project Manager, Peel Region
437-788-6195
Dania Chehab
Consultant Project Manager, GHD
647-553-6893
Background
Peel Region has initiated a Study for the Twinning of the Meadowvale North and Streetsville Transmission Mains to meet the Region's growing water demands. As part of the Study, alternative routes for the new transmission mains are being examined. There are two sub-segments to this route: from Herridge Pumping Station to the Streetsville Reservoir, and from the Streetsville Pumping Station to the Meadowvale North Reservoir. The alternative transmission main routes will be comparatively evaluated in consideration of several evaluation criteria and the opportunity for public feedback leading to the selection of a preferred route.
This Class EA will explore solutions to provide water transmission capacity that is essential to service future community growth and development to 2051. The Study will also consider opportunities for resiliency and security, operational flexibility, and system maintainability to continue to provide safe and reliable water servicing.
Study process
The Study is being performed in accordance with the Schedule C process in the Municipal Class Environmental Assessment (MCEA), 2024, which includes defining the problem and/or opportunity, identifying and evaluating alternatives, selecting a preferred alternative, identifying potential impacts on the environment, and developing appropriate mitigation measures. As part of this Study the Region will be:
- Holding public and agency stakeholder meetings.
- Providing a solution that best meets the needs of existing and future servicing areas.
- Investigating alternative long-term servicing strategies, routes, and design concepts.
- Confirming the preferred plan, including routes, design, and schedule.
Your input is important
Consultation with review agencies, Indigenous Communities, and the public is an important component of the MCEA. Two Public Information Centres (PICs) will be held during the Study period to obtain input from the public for consideration by the Region. The first PIC is planned for Fall 2025 to present the alternative routes, evaluation, and recommended route. Once the Study is complete, an Environmental Study Report will be prepared and made available for comment.
Contact the team
Contact a member of the Project team to provide comments, ask questions, receive further information, or to be added to the Study’s contact list to receive future notifications directly:
Gareth Clemens
Project Manager - Environmental Assessments and Studies
Water & Wastewater Infrastructure Planning
Public Works
Dania Chehab
Consultant Project Manager
GHD
70 York St, Suite 810
Toronto, ON, M5J 1S9
647-553-6893
