Is it my problem or the city's?

Drains City

The City Wide Group can quickly identify the location of the problem. Generally, if all or many of your neighbours have the same complaint, it’s a problem in the civic system. If the sewage backs up through a single sink, toilet, or other drain, the cause is somewhere in your sewage line and you’ll benefit by phoning the City Wide Group to help. Some homeowners may decide to isolate their home from the City system by installing a back-water valve on the sanitary sewage and/or stormwater connection.

In the City of Toronto a subsidy may be available for such work.