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Mid-Halton Outfall Pipe - Third Line & Coronation Park


Town of Oakville

Project Type:



Halton Region is making the following improvements to support the expansion of the Mid-Halton Wastewater Treatment Plant:

  • Installing a 6.3 kilometre outfall pipe to put clean, treated wastewater from the Mid-Halton Wastewater Treatment Plant back into Lake Ontario by tunneling under Third Line
  • Installing 18 diffusers in Lake Ontario to improve the dilution and mixing of clean, treated wastewater.
  • Work areaWork area
Project Status:

In progress

Start Date:
End Date

Fall 2014
February 2019

Project #



For more information, call 311 or email

Additional Information:

Four-hectare (0.04 sq. km) fenced area installed at Coronation Park will be located west of the east parking lot. There will be increased truck traffic in and out of the park, increased noise and vibration and occasional lane restrictions on Lakeshore Road West.

Learn about the expansion of the Mid-Halton Wastewater Treatment Plant.

Additional Photos:

Lifting the main beam into the shaft

Cutter head in the starter tunnel

Aerial view of the shaft site

Road header excavation

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