Pollution Prevention and Control Plan (PPCP) Master Plan Class Environmental Assessment
What is a Pollution Prevention and Control Plan (PPCP)?
A PPCP is a long-term strategy to identify, investigate, and reduce sewer system overflows in the City of London.
The study is being developed as a Master Plan under the Municipal Class Environmental Assessment Process, which provides the opportunity for the public and any other stakeholders to provide input.
The Pollution Prevention and Control Plan provides the City of London with a road map for implementation of infrastructure improvement projects that will mitigate the impacts of wet weather sewer system overflows on the Thames River, in alignment with the City's commitment to environmental stewardship and the protection of water resources.
Why do sewers overflow?
Sanitary sewers can become overwhelmed due to too much inflow or infiltration. When this happens, the sanitary sewer can back up, causing risk of basement flooding. Historically, to prevent basement flooding, overflow connections between the sanitary and storm sewer were created. When overflows are active, untreated wastewater is diverted to storm sewers which outlet to the river.
The City cannot simply remove these existing overflows as they serve the important purpose of preventing basement flooding.
The PPCP is a careful study of all overflows in London and will include field investigation hydraulic modelling, water quality analysis, and strategies to minimize the extent and impact of sewer system overflows.
Full details of Phase 3 of the PPCP can be found below:
Public Information Centre #3: November 1, 2017
Full details of Phase 2 of the PPCP can be found below:
Public Information Centre #2: May 28, 2014
Full details of Phase 1 of the PPCP can be found below:
Public Information Centre #1: October 3, 2012
Frequently Asked Questions: