The North Toronto Treatment Plant is located at 21 Redway Road in the Don Valley on 22 hectares of land. The plant serves about 183,000 people and can treat up to 34 million litres of wastewater a day.
The plant began operating in 1929.
The plant provides preliminary and primary wastewater treatment, which includes:
Learn more about how we collect and treat wastewater.
The City is upgrading the combined sewer overflow tank and stormwater storage tanks at the North Toronto Treatment Plant as part of the Wet Weather Flow Master Plan. The detailed design phase will start in late 2026 and will take about two years to complete. Construction is expected to begin in 2029.
The upgrades will help improve water quality in the Lower Don River by:
Odours or unpleasant smells near wastewater treatment plants are common and typically short-lived. Local and major sewers can also cause similar temporary odours. Weather conditions, including wind direction, temperature and humidity can make normal treatment-related odours more noticeable at times.
Report an unpleasant smell or odour that you suspect is coming from a wastewater treatment plant.
All odour complaints are taken seriously and will be investigated by staff. Identifying the source can be complex, as conditions may change between the time an odour is reported and when staff are able to complete a site investigation.