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December 19, 2018
Ingersoll Wastewater Treatment Plant improvements unveiled

The project includes upgrades to – and expansion of – existing Ingersoll wastewater treatment infrastructure

Public Works has unveiled improvements to the Ingersoll Wastewater Treatment Plant (WWTP) after a multi-year construction project that included upgrades to some existing areas of the plant and full demolition and replacement of other areas.

UpdateIngersoll Wastewater Treatment Plant recognized as Project of the Year by Ontario Public Works Association (Feb 2019)

Phase I of this project, designed by R.V. Anderson Associates Ltd., began in 2013 and served to expand the wastewater treatment capacity to an average day flow (ADF) of 12,945 m³/day. Further Phase II upgrades will be completed in the coming years to accommodate a projected ADF of 14,250 m³/day by 2035 to service ongoing growth in the community. This project included:

  • Upgrading the 1974 WWTP to provide sufficient treatment capacity during construction
  • Constructing new WWTP components to replace the 1947 WWTP infrastructure which was at the end of its useful service life
  • Decommissioning the 1947 WWTP while keeping the overall facility operational
  • Constructing a new WWTP effluent outfall into the Thames River

The project required technical expertise and a complex phasing strategy, as the older WWTP infrastructure needed to remain functional until the new plant components were operational so as to not disrupt wastewater treatment operations. Given its success, this project is nominated for 2018 Project of the Year by the Ontario Public Works Association.

The Ingersoll Wastewater Treatment Plant provides wastewater treatment for residential, commercial and industrial users in Ingersoll and is designated as a Class III Wastewater Treatment facility. A high level of treatment is achieved before the treated wastewater effluent is discharged back to the environment at the Thames River in full compliance with provincial regulations. Biosolids that are generated at the Ingersoll WWTP are treated and stored offsite before being applied to agricultural land as a valuable fertilizer product.


Mark Maxwell, Project Engineer and Construction Coordinator, Oxford County

“This upgrade and expansion needed complex construction sequencing to ensure that the existing plant remained functional until the new plant was operational to maintain continuity of operations. With the help of our project partners, we have achieved the desired results at the Ingersoll Wastewater Treatment Plant.”


Download: BEFORE.jpg (438 kb)
Cut line: The original (1947) Ingersoll Wastewater Treatment Plant photographed prior to demolition in 2017.

Download: AFTER.jpg (2204 kb)
Cut line: The upgraded Ingersoll Wastewater Treatment Plant photographed following construction in 2018.

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About Oxford County

Located in the heart of southwestern Ontario at the crossroads of Highways 401 and 403, Oxford County has a population of approximately 114,000 people across eight area municipalities that are “growing stronger together.” As a partnership-oriented, two-tier municipal government, Oxford County is emerging as a leader in sustainable growth through the Future Oxford Community Sustainability Plan and County Council’s commitment to achieving 100% renewable energy, becoming a zero waste community, and working towards zero poverty. Situated in one of Ontario’s richest areas for farmland, agriculture is a key industry that serves as a springboard for some of the sustainable industries that are steadily diversifying the local economy. Oxford County offers a thriving local arts, culture and culinary community, as well as conservation parks, natural areas and more than 100 kilometres of scenic trails. The Oxford County Administration Building is located in Woodstock, Ontario. Visit or follow our social media sites at Oxford County’s Strategic Plan is at



Donna Kemp | Strategic Communication & Engagement
519.539.9800, ext. 3158 |

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