Sewer Services and Repair in Toronto and GTA
There are a lot of old main drains in Toronto that back up with sewer.
This is caused by several reasons, there could be roots that have penetrated the drain or debris that has been built up over the years.
The main drain can also be collapsed which again will cause a sewer to clog.
You will know that your sewer drain is clogged as it will back up in the first available place in the basement which is usually the floor drain. However, having a toilet in the basement backing up can also be a sign.