The City of Toronto has initiated a Municipal Class Environmental Assessment (EA) Study to find a long-term solution to sewer odours from the Coxwell Sanitary Trunk Sewer (STS). The Coxwell STS is located beneath Coxwell Avenue and Rhodes Avenue, carrying sewage to the Ashbridges Bay Wastewater Treatment Plant.

The City has received recurring odour complaints from residents in the vicinity of the sewer, primarily at the intersection of Rhodes Avenue and Fairford Avenue, and on Rhodes Avenue between Gerrard Street East and Dundas Street East.

A vent stack located on Rhodes Avenue allows for the release of sewer gases into the air to prevent their build-up inside the sewer. The vent stack is equipped with a carbon filter, but this has been ineffective in reducing odour in the area.

In order to find a long-term solution for the control of odour from the sewer, the City has initiated a Municipal Class Environmental Assessment (EA) Study.

The Study Area runs along Coxwell Avenue and Rhodes Avenue from Mortimer Avenue in the north to Dundas Street East in the south.

This is a map of the project study area, showing the Coxwell Sanitary Trunk Sewer from Mortimer Avenue in the north, to Dundas Street East in the south.
Coxwell STS EA Study Area


Two public consultation events are planned for this study. Notification of the events will be advertised in the local newspaper and notices mailed to residents and businesses within the study area. Information on events will also be available at

What is a Class Environmental Assessment (EA) Study?

The Municipal Class EA is a planning and approval process that applies to a variety of municipal infrastructure projects, including municipal water and wastewater projects. The Class EA process involves five phases of evaluation and provides opportunities for public input.

  1. Identify problem or opportunity
  2. Research natural, cultural and socio-economic conditions
  3. Identify alternative solutions and develop evaluation criteria (opportunity for public input)
  4. Evaluate solutions, select preferred solution(s), and develop design options (opportunity for public input)
  5. Complete final report (30 day review period)