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The first minutes matter more than anything the plumber does later. Water spreading through floors and walls soaks insulation, drywall and flooring, and sewage adds contamination that makes cleanup longer and riskier. Knowing where your main water shut-off valve is, and what to leave alone until help arrives, limits the damage and keeps the repair simpler.
In a Canadian home, plumbing emergencies follow the seasons: frozen and burst pipes during cold snaps, sewer backups and flooded basements during spring thaw and summer storms, and sump pumps that give out when the ground is saturated. An emergency visit first aims to stop the water and make the house safe; the permanent repair, a cleanup crew and an insurance claim often come afterwards.
What counts as a plumbing emergency
A dripping faucet, a slow drain or a running toilet can usually wait for a regular appointment, as long as you can close the fixture's own shut-off valve. The test is simple: if water is causing damage right now, if sewage is involved, or if the house has no water in freezing weather, treat it as urgent.
- Water is spraying or pouring from a pipe, fitting or appliance hose and a nearby valve won't stop it.
- Sewage or dirty water is coming up through a basement floor drain, toilet or shower.
- No water comes out anywhere in the house during freezing weather, which often points to a frozen pipe or water service.
- Water is dripping through a ceiling, into a light fixture or near the electrical panel.
- The water heater is leaking steadily from the tank itself.
- The sump pump has stopped while water keeps rising in the pit.
- Your only toilet is blocked or overflowing and a plunger doesn't clear it.
What to do before the emergency plumber arrives
- Close the main water shut-off valve, usually on the pipe where the water line enters the house near the meter, by turning it clockwise until it stops.
- Once the main valve is closed, open the lowest tap in the house to let the pressure and the remaining water drain out of the pipes.
- A smell of gas near the water heater or any appliance changes the priority: get everyone out first, then call the gas utility or 9-1-1 once you are outside.
- Stay out of standing water near outlets, appliances or the electrical panel, and don't try to shut off the power if there is water around the panel.
- If the water heater itself is leaking, turn it off as its label instructs, but only from a dry spot and without touching the gas line or wiring; leave the rest to the plumber.
- Stop using sinks, toilets, the dishwasher and the washing machine if sewage is backing up, since that water has nowhere to go.
- Lift valuables and boxes off the floor, and take photos and video of the damage for your insurer.
Frozen and burst pipes during a Canadian cold snap
Water expands as it freezes, and the pressure it builds can split copper and plastic pipe alike. The split is not always where the ice is, and a frozen pipe may not leak at all until it thaws, which is why the damage often shows up only when the weather turns milder. Pipes in exterior walls, unheated crawl spaces, garages and near the water entry are the usual suspects.
If no water comes out of a tap in freezing weather and there is no sign of a leak, the City of Toronto suggests opening a basement tap, preferably the cold-water tap in the laundry room, and warming the suspect pipe with a hair dryer, an electric heating pad, a space heater or warm towels. Never use a torch or any other open flame, which is a fire hazard.
If a pipe has already split, or the frozen section is inside a finished wall or underground, close the main valve and call a plumber. Contact your municipality as well, since the freeze may be on the city's side of the water service.
Sewer backup in the basement: warning signs and first steps
A sewer backup is a health hazard as well as a water problem, because sewage carries bacteria. Keep children and pets away, wear rubber boots and gloves if you must go near it, and don't try to clean up a large amount of contaminated water yourself. A plumber can clear a blockage in your own line and check whether the backwater valve closed properly; if the city sewer is overloaded, report it to your municipality too.
- The basement floor drain gurgles, bubbles or smells of sewage, especially during heavy rain.
- Water rises out of the floor drain or the lowest toilet or shower when fixtures upstairs are used.
- Several drains back up at once, which points to the main sewer line rather than a single fixture.
- The trouble starts during a downpour or a rapid snowmelt, when municipal sewers are running full.
Home insurance after a burst pipe or sewer backup
Home insurance treats water damage very differently depending on where the water came from. A sudden leak, slow seepage, a sewer backup and overland flooding are often separate risks, and the Insurance Bureau of Canada notes that basement damage from a sewer backup is covered only if you have bought specific, optional sewer backup coverage. Flooding from rivers or lakes is another optional coverage. Read your policy, or ask your broker, before you need it.
After an emergency, report the damage to your insurer as soon as possible, as the IBC recommends, and make a complete list of damaged items. Photograph everything before it is moved, keep ruined items unless they are a health hazard, and ask the plumber for a written report of the cause and the repair. That paperwork makes the claim easier to settle.
Preventing plumbing emergencies: backwater valves, sump pumps and shut-offs
- Have a plumber install a backwater valve on the main drain if your basement has a floor drain, toilet or shower, and keep it clean and easy to reach.
- Consider a battery backup for the sump pump, since the storms that raise the water table can also knock out the power.
- Replace a sump pump that runs constantly, cycles on and off rapidly or makes new noises before the next spring thaw.
- Close the main water valve before leaving for a winter trip, and ask someone to check that the heat stays on while you're away.
- Place water leak alarms on the floor near the water heater, the washing machine and the sump pit.
- Ask a plumber to replace a main shut-off valve that is seized, corroded or hard to reach.
Emergency Plumbers: frequently asked questions
When should I call an emergency plumber instead of waiting?
Call right away if water is actively damaging the house and you can't stop it, if sewage is coming up into the basement, if the house has no water in freezing weather, or if water has reached electrical equipment. If you can close a local shut-off valve and the problem is contained, a next-day appointment is often fine.
Where is my main water shut-off valve?
In most houses it is in the basement or utility room, on the pipe where the water service comes through the foundation, close to the water meter. In homes on a well it is usually near the pressure tank. Some homes have it in a crawl space or behind an access panel. Find it before you need it and make sure it turns.
Should I turn off the water heater when the water is shut off?
If the main valve will stay closed for a while, or the water heater itself is leaking, it is reasonable to turn the heater off following the instructions on its label, as long as you can reach it from a dry spot. Don't relight a gas unit or touch its gas line or wiring; the plumber will restart it safely once the water is back on.
Is a burst pipe covered by home insurance?
Many policies cover sudden water damage from a burst pipe, but it depends on your contract and on the cause. Damage from a pipe that froze in a house left without heat, or from a leak that went on for a long time, may be treated differently. Call your insurer or broker as soon as possible, and keep the photos and the plumber's report.
Can an emergency plumber stop a sewer backup?
A plumber can clear a blockage in your home's drain or sewer line, often using a drain snake and a camera to find the cause, and can check or repair the backwater valve. If the backup comes from an overloaded municipal sewer during a storm, the water may keep rising until the city system drains, so report it to your municipality as well.
Can I use my water after a pipe bursts?
Not until the broken section is isolated or repaired. Sometimes a plumber can close a branch valve and restore water to the rest of the house the same day. Until then, leave the main valve closed, and don't use electrical appliances or outlets that got wet until an electrician has checked them.
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Written by the LokalMatch editorial team. Reviewed by Zubair Afzal on September 10, 2026. How we write and check our guides