Sewer Line Repair in Toronto & the GTA
The sewer line is the one pipe that carries everything out of the house, and sewer line repair means fixing the failures that stop that flow, whether the cause is tree root intrusion, a collapsed clay pipe, a blockage from grease or wipes, or a backup triggered by heavy rain. In Toronto's older neighbourhoods, that pipe is often clay laid decades ago, with joints that tree roots have been finding ever since. Heavy rain adds its own problem: a City sewer running full can push water back up into basements that were dry an hour before, bringing foul odours, contamination, and fast property damage with it.
For homeowners and property managers in the Greater Toronto Area dealing with a sewer backup, slow drains, or signs of a broken line, this guide explains what usually goes wrong, how to spot the warning signs, which repair methods plumbers use, including trenchless options, what affects cost, how to prepare before the plumber arrives, and what licensing matters to check. Call us and our assistant confirms what you are seeing and your postal code, then connects you live to a plumber who is available now. Sewer problems rarely wait, and the phone line is answered around the clock.
When it can’t wait
- Sewage or grey water is coming up a floor drain, a basement toilet or a shower. Keep everyone out of it.
- Several drains have slow drains or are backing up at the same time, especially on the lowest floor.
- You notice foul odors in the house or in the yard.
- A patch of the lawn is unusually green or soggy along the line to the street.
Any of these are warning signs of sewer line issues or other sewer issues, and quick action can help prevent further damage and costly repairs. Emergency sewer service, sewer line repair, and sewer line replacement are available 24/7—call (437) 523-7772
Common sewer line problems
Tree roots in a clay pipe
The classic Toronto and Etobicoke sewer problem. Roots enter at the joints, and root intrusion catches paper and grease until the pipe fills, which a camera can confirm when showing tree root intrusion. Augering buys time; hydro-jetting clears more; a liner or replacement stops recurring root growth in aging sewer pipes.
Backup during heavy rain
When the City's sewer surcharges, water can flow backwards into homes without a backwater valve. During heavy rain, pressure in the wider sewer system can trigger sewer backups or sewage backups in homes that lack this protection. The City runs a subsidy program for installing one; ask about it when the plumber is there, and report the flooding to Toronto 311.
Bellied or collapsed section
A pipe that has sagged holds water and waste in the low spot and, if the line leaks, can affect the surrounding soil; bellied pipes slow flow, while a section that has collapsed blocks it completely. Only a camera inspection shows which, and where, to find the root cause: high-definition cameras transmit live video to pinpoint the exact problem area in the sewer pipeline and check for offset pipes, joint separation, pipe collapse, and other structural damage.
Grease and wipes
Flushable wipes are not. They combine with kitchen grease into blockages caused by grease buildup, often mixed with other debris, and the blockage is usually well down the line. Avoid flushing paper towels and similar items.
Sewer gas smell
A dry trap in a rarely used floor drain, a cracked vent, or a break in the line under the basement floor. The first is a cup of water; the last is a real repair, especially if sewer gas is coming from a broken line and creating health hazards.
Before the plumber arrives
- Stop using water in the house: no flushing, no showers, no laundry or dishwasher. Everything you send down is coming back.
- Keep people and pets away from any standing water in the basement. Treat it as sewage even if it looks clear.
- If water is near the furnace, water heater or electrical panel, switch off the power to the basement at the breaker if you can do so without stepping in the water.
- Take photos before cleaning anything; your insurer will want them.
- Locate the main cleanout for the main sewer line (a capped fitting in the basement floor or wall, usually near the front) and clear a path to it.
What affects the cost
We do not quote prices; the plumber you are connected to does, before the work starts. These are the things that move the number.
Where the fault is
A blockage near the cleanout is a quick auger job. A break 15 metres out, two metres under the front lawn, is excavation.
The method
Sewer repair methods such as augering, hydro-jetting, sewer pipe repair with a cured-in-place liner, and full replacement are very different in cost and in how long they last, and trenchless methods include CIPP lining and pipe bursting. The camera inspection comes first so the choice is informed, especially when a break is found in underground pipes under the front lawn, helping plumbers compare repair methods, repair options, and sewer line replacement based on the condition of the existing sewer line and the existing pipe. Trenchless sewer repair can be a smart fit when property access is tight, and trenchless sewer solutions often allow minimal disruption compared with traditional excavation. Among the no dig options, pipe lining creates a new pipe inside the damaged line, and a cured-in-place liner can extend pipe lifespan by 50 years. Spot repair can address a localized defect with a fiberglass patch. Internal pipe coating can seal small leaks with epoxy resin. In more severe cases, replacement services may be the better path when there is extensive damage or large cracks; for entire sewer lines beyond what a liner can solve, pipe bursting uses a hydraulic machine to fracture the old pipe and install a new plastic pipe, replacing damaged pipes without extensive excavation.
Public side or private side
The pipe on your property is yours; from the property line to the main it is the City's. If the camera shows the fault on the City's side, the repair is theirs, and Toronto 311 takes the report.
Permits and restoration
Excavation on the property needs a permit and leaves a lawn, a driveway or a sidewalk to put back. These costs should appear in the quote, not turn into unexpected repairs later.
Licensing and safety
Sewer and drain work is plumbing, and it affects the home's wider plumbing system, a compulsory trade in Ontario requiring a Skilled Trades Ontario certificate of qualification (306A). Every plumber in our network agrees in writing to hold the licences and insurance the province requires; ask for the number, because unresolved sewer line damage can lead to serious damage in the home if ignored.
A backwater valve installation in Toronto requires a building permit and, when done through the City's Basement Flooding Protection Subsidy Program, a licensed contractor. Ask the plumber about eligibility; the paperwork is theirs to know.
Questions about sewer line
How do I know if it is my sewer line or the City's?
From inside the house you usually cannot. A plumber's camera shows whether your pipe is clear to the property line. If it is, and water still backs up, the problem is on the public side and Toronto 311 handles it. If several neighbours flooded at the same time during a storm, that also points to the City's sewer.
What is a backwater valve, and do I need one?
A one-way valve on your sewer line that closes when water tries to flow back toward the house. If your basement has flooded from the drains during heavy rain, it is the standard fix. The City of Toronto offers a subsidy toward installing one; the plumber can tell you whether your home qualifies.
Can tree roots be stopped for good?
Cutting them clears the pipe for a while; they grow back through the same joints. A liner seals the joints from the inside and stops them re-entering. Replacing the section with modern jointless pipe does the same. The plumber will show you the camera footage and explain which is worth it.
Is a sewer smell dangerous?
Sewer gas is unpleasant and, in quantity, harmful. Ventilate the room and check the floor drains: a dry trap lets gas through and a cup of water fixes it. If the smell persists, or you cannot find a dry drain, call. If you smell natural gas rather than sewage, leave the building and call Enbridge Gas at 1-866-763-5427 first.
Do you repair sewer lines yourselves?
No. 2plumbers.ca is a live call-connection service run by PatchLead. We confirm what is happening and where you are, then connect you on the same call to an independent plumber from our network who inspects, quotes and does the work. You pay nothing to use the service.