Emergency Plumbing in Toronto: What to Do Before the Plumber Arrives

A plumbing emergency can cause thousands of dollars in water damage within minutes. The actions you take in the first five to ten minutes — before a plumber arrives — can mean the difference between a manageable repair and a full-scale restoration project.

After 18 years of responding to urgent calls across the GTA, I’ve seen firsthand how quickly water can destroy drywall, flooring, and personal belongings. Here’s exactly what to do when things go wrong.

Step 1: Shut Off the Water

This is the single most important thing you can do. Every minute water keeps flowing, the damage compounds.

Localized Shut-Off Valves

Most fixtures have individual shut-off valves nearby:

• Toilets: Look for an oval handle on the wall or floor behind the toilet, near the base. Turn it clockwise until it stops.
• Sinks: Check under the cabinet for two valves (hot and cold) on the supply lines. Turn both clockwise.
• Washing machine: Two valves on the wall behind the unit — red for hot, blue for cold.
• Water heater: A valve on the cold water inlet pipe at the top of the tank.

If the leak is at a specific fixture and you can reach the local valve, shut it off immediately. This stops the flow without affecting water to the rest of your home.

Main Water Shut-Off

If you can’t identify the source, or if water is pouring from a pipe inside a wall or ceiling, shut off the main water supply. In most GTA homes, the main shut-off is located:

• In the basement near the front wall of the house, where the municipal water line enters
• In a utility room or mechanical closet
• Near the water metre — look for a lever-style handle or a round gate valve

Turn the valve clockwise (gate valve) or perpendicular to the pipe (lever valve) to shut off all water to the house. If the valve is seized or won’t turn, don’t force it — you risk breaking it. Call your municipality’s emergency water line to have them shut off at the street.

Make sure every adult in your household knows where the main shut-off is. Walk through it today — don’t wait for an emergency to find out.

Step 2: Turn Off the Water Heater

If you’ve shut off the main water supply, turn off your water heater as well. Running a water heater with no incoming water can cause overheating and damage the unit.

• Gas water heater: Turn the thermostat dial to the “pilot” or “off” position.
• Electric water heater: Switch off the dedicated breaker in your electrical panel.

Step 3: Contain the Water

With the supply stopped, focus on limiting damage from water that’s already escaped:

• Move valuables away from the affected area — electronics, documents, and anything that can’t handle moisture.
• Use towels and buckets to absorb standing water and catch any continued dripping.
• Open cabinet doors under sinks to let wet areas air out and prevent mould growth.
• If water is coming through the ceiling, poke a small hole at the lowest point of the bulge with a screwdriver and place a bucket underneath. This prevents the ceiling from collapsing under the water’s weight.

Step 4: Document Everything

Before you start cleaning up, take photos and video of the damage from multiple angles. Your home insurance likely covers sudden water damage (like a burst pipe), but the claims process goes much smoother with thorough documentation.

Photograph the source of the leak, any damaged walls or flooring, and affected personal property. Note the date and time. Your insurer will want this information, and so will your plumber — it helps with diagnosis.

What Counts as a Plumbing Emergency?

Not every plumbing problem requires an urgent service call. Here’s how to tell the difference:

Call immediately for

• Burst or severely leaking pipes
• Sewage backing up into your home
• No water at all (after checking if it’s a municipal issue)
• Gas smell near a water heater or gas line
• Water pouring through ceilings or walls
• A toilet that won’t stop overflowing after the valve is shut

Can wait until regular business hours

• A slow drain that still empties
• A dripping faucet
• Low water pressure without leaking
• A running toilet (shut the valve off and schedule a visit)
• Minor pipe condensation

For genuine emergencies, our 24/7 emergency plumbing service dispatches licensed plumbers across the Greater Toronto Area with an average response time of 45 minutes.

Common Winter Emergencies in the GTA

Ontario winters bring a specific set of plumbing risks. Frozen pipes are the leading cause of emergency calls we receive between December and March.

Pipes most vulnerable to freezing are those running through exterior walls, unheated garages, crawl spaces, and near windows or vents. When water freezes inside a pipe, it expands and can crack even copper or PVC.

To prevent frozen pipes:

• Keep cabinet doors open under sinks on exterior walls during cold snaps
• Let a thin stream of water trickle from faucets connected to vulnerable pipes overnight
• Maintain your home’s thermostat at a minimum of 13°C (55°F), even when away
• Insulate exposed pipes in unheated areas with foam pipe sleeves

The Ontario Building Code specifies minimum insulation requirements for plumbing in new construction, but older homes often fall short of current standards.

Before the Plumber Arrives

Once you’ve controlled the immediate situation, a few more things to prepare:

• Clear a path to the affected area and the main shut-off valve.
• Note what happened — when did you first notice the problem? What were you doing? Did anything unusual happen beforehand?
• Check your insurance policy for emergency water damage coverage and your deductible amount.
• Keep pets and children away from wet areas, especially if there’s any risk of sewage contamination.

A prepared homeowner saves us time on arrival, which means we can get to the actual fix faster. If you’re experiencing a plumbing emergency right now, call us at (416) 555-1234 or visit our emergency services page — we’re available around the clock, every day of the year.