The Ashbridges Bay Treatment Plant (ABTP) is one of four sewage treatment plants operated by the City of Toronto. Located at 9 Leslie St. in Toronto’s east end, Ashbridges Bay is one of Canada’s largest, and oldest wastewater treatment plants. The plant provides sewage treatment for wastewater collected from residents and businesses that are within its servicing boundaries.

Ashbridges Bay Treatment Plant formed two committees:

  • Neighbourhood Liaison Committee (NLC)
  • Implementation & Compliance Monitoring Committee (ICMC)

Annual Compliance Report:

The City formed a Neighbourhood Liaison Committee (NLC) to provide interested residents and businesses an opportunity to discuss plant issues with City staff. Committee members also had the opportunity to provide input on issues related to the plant that could affect the surrounding community, such as proposed changes to the facility.

Read the NLC Terms of Reference from the 1999 Mediation Agreement.

Mandate of the Committee

The mandate of the Main Sewage Treatment Plant (MSTP) NLC was to:

  • review and provide input, advice, and make recommendations on plant operations, any proposed use or development of the MSTP Site and any Environmental Assessment (EA) implementation issues that may have a direct impact on the community in the vicinity of the MSTP, including the environment, recreational waters and lake quality, and including those issues set out in Resolution #9 to the MSTP EA Mediation Agreement;
  • develop criteria for evaluating proposed uses or developments on the MSTP Site;
  • act as a liaison facilitating two way communications between the community and the City of Toronto with respect to issues relating to the MSTP; and
  • act as a liaison facilitating two way communications between the MSTP NLC and the MSTP EA Implementation and Compliance Monitoring Committee (ICMC) with respect to any implementation or compliance issues of concern to the community in the vicinity of the MSTP.

For meeting minutes, please contact tracy.manolakakis@toronto.ca.

The former municipality of Metropolitan Toronto submitted the Main Treatment Plant Environmental Assessment (MSTP EA) to the Minister of the Environment for approval under the Environmental Assessment Act in December 1997.

The purpose of the Environmental Assessment (EA) was to establish a plan to meet future wastewater needs in the service area to the year 2011 and to improve the effectiveness of the MSTP at reducing environmental impacts.

There were nine individuals or groups who requested that the Minister impose a hearing and/or mediation to address their concerns related to the EA.

Through 24 mediation sessions, the Ashbridges Bay Treatment Plant Environmental Assessment’s Mediation Agreement was developed. The City, public and non-governmental organizations reached agreements in April 1999 and signed the Mediation Agreement.

In the Mediation Agreement, provision was made for the creation of the Implementation and Compliance Monitoring Committee, more commonly known as the ICMC. The Terms of Reference for the ICMC are contained in Resolution #10 of the Mediation Agreement.

The overall purpose of the ICMC is to provide public input to the City relating to the implementation of the EA Approval. Since 2012, the ICMC has been meeting to provide information, discuss and receive comments relating to projects resulting from the approved EA Undertakings. These EA Approved Undertaking projects include a new effluent pumping station, an ultraviolet disinfection system and outfall pipe at Ashbridges Bay Wastewater Treatment Plant.

Date modified: June 5, 2026