On this page:
1. Project Updates
2. Map of Project Area
3. Quarterly Progress Reports
The Thornbury Wastewater Treatment Plant was completed in 1994, with a rated capacity of 3580 m3/day. This project will include the construction/installation of all equipment required for operation of the Extended Aeration treatment system to increase capacity to 5,330 m3/day.
Step 1
- Civil site prep work
Step 2
- Addition of one extended aeration tank, including aeration system, required accessories, and alum addition
- Addition of one clarifier and associated mechanical system
- Increase the current Ultraviolet disinfection system to meet 5,330 m3/day
- Replacement of existing air blowers, including required valves, controls, instrumentation and distribution piping
- Additional 14,000 m3/day mechanical screen and associated hardware to be added
- Incorporate energy efficiency throughout the plant
- Construction of a new outfall pipe to Georgian Bay
Expansion of the plant was approved as part of the 2020 Town Budget. It is anticipated that the detailed design will be completed in Q3 2022. Construction will be completed in two steps to allow for scheduled advancements. The first step is scheduled to be completed in Q3 2022, with the second step beginning immediately afterwards. The project is expected to be completed in Q4 of 2026.
Why Now?
To replace end-of-life equipment and ensure the Thornbury Wastewater Treatment Plant is capable of providing reliable service in line with the forecasted growth of the community.
Project Updates
April 17, 2023 - Request for budget increase
Staff Report CSOPS.23.017 was presented at a Special Meeting of Council on Friday, April 14. The report requested that the budget for the Thornbury Wastewater Treatment Plant Expansion Phase 1A construction be increased by $4,873,000, to a total budget of $29,000,000 to allow staff to award the construction tender. The request was carried as Council voted to approve the request.
This staff report was brought directly to Council as there is an urgency to keep the project on schedule, and ensure there is adequate capacity at the treatment plant to meet the ongoing needs of the Town.

Quarterly Progress Reports
Q1 2023 | Project Scope: Within expanded scope Project Schedule: On revised schedule Project Budget: Within revised budget |
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Q4 2022 | Project Scope: Within expanded scope Project Schedule: On revised schedule Project Budget: Within revised budget |
Q3 2022 | Project Scope: Within expanded scope Project Schedule: On revised schedule Project Budget: Within revised budget |
Q2 2022 | Project Scope: Scope expanded Notes: Project scope, schedule and budget has increased to include the design and construction of a new outfall pipe. |
Q1 2022 | Project Scope: Within scope Project Schedule: On schedule Project Budget: Within budget |