If you are a single-family homeowner, a condominium property manager or street-level business, we want to learn about the source of your flooding issues.


Basement Flooding Study Area 42 is located within Toronto’s downtown, in the area between Queen Street to Dundas Street and Keele Street to the Don Valley Parkway.  This area has experienced basement and recurring surface flooding during extreme storm events.

A study is underway to determine the contributing factors for surface and basement flooding and recommend solutions to improve the City’s sewer system and overland drainage routes in order to mitigate flooding problems.

Potential solutions may include:

  • Upsized sewers
  • Underground storage
  • New or upgraded pumping stations
  • Wet or dry ponds

Contact us to sign-up for updates on this study.

Study Area 42 is roughly located in the area bounded by Keele-Dundas-Queen Streets & Don Valley Parkway and Lake Ontario.  The City’s Low- Level Combined Sewer Interceptor services the area.

Map of Basement Flooding Study Area 42. If you need help reading this map, contact the Public Consultation Unit at floodingstudy@toronto.ca or 416-392-8210.

The public will have an opportunity to provide feedback on the study recommendations.  Contact us to sign-up for updates on this study.


July 2019
September 2019

What is a Class Environmental Assessment?

Ontario’s Environmental Assessment (EA) programOpens in new window promotes good environmental planning by determining and managing the potential effects of a project prior to implementation.

The EA program ensures that public concerns are heard. EA balances economic, social, cultural and natural environmental needs so that projects benefit Ontario.

This study is being carried out according to the Municipal Class Environmental Assessment Master Plan process. This is an approved approach to satisfying requirements of the Environmental Assessment Act specifically tailored to municipal infrastructure. The process includes identifying the problem or opportunity to be addressed, developing and evaluating a range of alternative solutions, providing opportunities for public input and identifying a preferred solution.