A plumbing emergency is any situation that poses an immediate risk of water damage, property damage, or a health hazard if it isn’t addressed right away. This includes burst pipes, active flooding, sewage backing up into your home, a gas smell near plumbing fixtures, and a complete loss of water supply. If water is actively damaging your home or your family’s safety is at risk, that’s an emergency and you should call a plumber immediately. But not every plumbing problem falls into that category. A slow drip, a running toilet, or a single sluggish drain are frustrating, but they can almost always wait for a regular scheduled appointment, which will save you the premium that comes with an after-hours or emergency call.
Which Plumbing Problems Are True Emergencies?
The common thread in every true plumbing emergency is that the situation is getting worse with every minute you wait. These are the scenarios that require immediate professional attention.
A burst pipe or active water leak you can’t stop. A burst pipe can release hundreds of litres of water per hour into your home. Water begins soaking into drywall, flooring, and structural framing within minutes, and mold can begin growing within 24 to 48 hours of the initial moisture event. The longer water runs, the more expensive the damage.
Sewage backing up into your home. If wastewater is coming up through floor drains, toilets, or tubs, you have a mainline blockage or a sewer surcharge event. Raw sewage in your home is a health hazard. Stop using all water fixtures immediately and call a plumber.
A gas smell near your water heater or any plumbing fixture. If you smell gas, leave the house, don’t use any light switches or electronics, and call your gas utility’s emergency line from outside. Once the gas issue is cleared, a plumber may be needed to address the fixture.
Complete loss of water supply to the home. If every tap in your house has stopped producing water and your neighbours are unaffected, there may be a supply line break on your property. If you are on a well, it is recommended to call a plumber for proper diagnosis.This needs professional diagnosis.
Active flooding from any source. Whether it’s coming through the floor drains, pouring from a ceiling, or pooling around your water heater, active flooding is an emergency. Shut off the water supply if you can safely reach the valve, and call a plumber.
An overflowing toilet that won’t stop. If the shut-off valve at the base of the toilet doesn’t stop the flow, or if there’s no shut-off valve, you need to shut off the main water supply and call for help.
Which Plumbing Problems Can Wait for a Regular Appointment?
Being honest about what doesn’t require an emergency call can save you significant money. Emergency service rates in Canada typically run 1.5 to 2 times the standard rate, and after-hours dispatch fees can add $150 to $300 on top of that. If the problem is containable and isn’t actively causing damage, scheduling a regular appointment is the smarter move.
A dripping faucet. Annoying and wasteful, but not urgent. A faucet drip can wait days or even weeks for a scheduled repair without causing damage.
A running toilet. The flapper or fill valve likely needs replacing. It wastes water and adds to your bill, but it’s not causing structural damage and can wait for a regular visit.
A single slow drain. One sluggish drain usually means a localized clog in that fixture’s branch line. It’s a routine service call, not an emergency.
Low water pressure. Unless it’s a sudden, complete loss across the whole house (which would be an emergency), low pressure is a diagnostic issue that’s best handled during regular business hours.
A minor leak you can contain. If you can put a bucket under a drip and it’s not getting worse, you have time to schedule a visit. Keep an eye on it, but there’s no need to pay emergency rates.
A dripping outdoor hose bib. Unless it’s winter and the drip is at risk of causing an ice dam or frozen pipe issue, this can wait.
The key question to ask yourself: is this situation getting worse right now, or is it stable? If it’s stable and containable, it can wait. If it’s escalating, it’s an emergency.
What Should You Do First in a Plumbing Emergency?
The first few minutes of a plumbing emergency determine how much damage your home sustains. Here’s the order of operations.
Shut off the water. This is the single most important step. If the problem is at a single fixture (toilet, sink, washing machine), look for the local shut-off valve, usually a small handle on the supply line going to that fixture, and turn it clockwise. If you can’t find a local valve or the problem is in a main line, go to your main water shut-off valve and turn it off. Every homeowner should know where their main shut-off is before they need it.
Check for electrical hazards. If standing water is near electrical outlets, your breaker panel, or any appliances, do not step into the water. Turn off the power to the affected area from your breaker panel if you can safely reach it. If there’s any doubt, stay out of the water and call for help.
Stop using all plumbing fixtures. If you suspect a sewer backup, stop running any water in the house. Every flush, every tap, and every appliance that drains is adding to the problem.
Document the damage. Take photos and video of the affected area before you start cleaning up. Your insurance claim will go more smoothly with documented evidence of the initial damage, and some insurers require it.
Call a licensed plumber. Describe the situation clearly: what’s happening, where the water is coming from, whether you’ve been able to shut off the supply, and how long the issue has been going on. This helps the plumber prepare the right tools and parts before arriving.
Move valuables out of the affected area. While you’re waiting for the plumber, get anything that can be damaged by water out of the way. Furniture, electronics, documents, and anything stored on the floor in the affected area.
Where Is Your Main Water Shut-Off Valve?
If you take one thing away from this post, let it be this: find your main water shut-off valve today, before you ever need it.
In most Kanata and Stittsville homes, the main shut-off valve is located in the basement, near the front of the house, close to where the water supply line enters from the street. It’s typically a gate valve (round handle you turn) or a ball valve (lever handle you turn 90 degrees). Ball valves are faster and more reliable in an emergency because they shut off with a quarter turn.
Test it now. Turn it clockwise (or flip the lever perpendicular to the pipe), then go upstairs and run a tap to confirm the water stops. If the valve is seized, stiff, or leaking when you try to turn it, have a plumber replace it before you’re relying on it during a 2 AM pipe burst.
If your home has a more complex system with multiple shut-off points (common in homes with additions or secondary suites), make sure you know which valve controls what. Label them if they aren’t already.
How to Tell if You Have a Burst Pipe Behind a Wall
Not every burst pipe announces itself with a dramatic spray of water. Some of the most damaging failures happen behind walls, under floors, or in ceilings where they can run undetected for hours.
Watch for these signs: water stains appearing on walls or ceilings with no obvious source above, the sound of running water when nothing is turned on, a sudden unexplained drop in water pressure, a spike in your water bill that doesn’t match your usage, damp or musty smell in a specific area of the house, bubbling or peeling paint on walls, or warped flooring.
If you notice any of these, especially more than one at the same time, shut off the main water supply and call a plumber. The faster a hidden leak is found and stopped, the less damage it does to your home’s structure and the lower the risk of mould.
Why Do Pipes Burst in Winter?
Ottawa’s winters are hard on plumbing. Pipes burst when water inside them freezes, expanding by roughly 9% and generating pressure that can exceed 2,000 pounds per square inch. That pressure cracks the pipe, and when the ice thaws, water flows through the break.
The most common victims are pipes in unheated areas: basements, crawl spaces, exterior walls, garages, and attics. But even pipes in heated spaces can freeze during a prolonged power outage when indoor temperatures drop. For a detailed guide on protecting your home, see our post on how to prevent frozen pipes in your Kanata or Stittsville home.
What Should You Do if Your Sewer Backs Up?
A sewer backup is one of the most unpleasant emergencies a homeowner can face, and it requires a different response than a burst pipe.
Stop using all water in the house immediately. Every toilet flush and every tap you run adds more water to a system that’s already blocked. Don’t try to plunge or snake the line yourself, because if the blockage is in the main sewer lateral, you can make it worse or push sewage further into the home.
Open windows in the affected area if safe to do so. Sewer gases contain hydrogen sulphide and methane, which are harmful to breathe in concentrated amounts.
Avoid direct contact with the sewage. It contains bacteria and pathogens that pose real health risks. If you need to move through the area, wear rubber boots and gloves.
Call a plumber who can diagnose the blockage. A drain camera inspection is the fastest way to identify whether the blockage is in your home’s plumbing or in the sewer lateral, and what’s causing it (roots, grease, a collapsed pipe, or an object).
If your home doesn’t already have a backwater valve, a sewer backup is the clearest possible sign that you need one. For details on backwater valves, sump pumps, and Ottawa’s rebate program, see our post on basement flood prevention.
Should I Call a Plumber or Try to Fix It Myself?
Some plumbing issues are genuinely suited to a DIY fix: replacing a toilet flapper, swapping a showerhead, tightening a loose connection under the sink. These are low-risk, low-skill tasks that most homeowners can handle.
But anything that involves the main water supply, the drain-waste-vent system, gas connections, or a situation where water is actively causing damage should be handled by a licensed plumber. In Ontario, certain plumbing work legally requires a licensed professional and a permit. Doing it yourself can void your home insurance, create code violations, and cause bigger problems down the line.
If you’re not sure whether your situation is a DIY fix or a professional job, that’s exactly what our Virtual Plumber service is built for. Connect with a Red Seal certified plumber over video call, show them what you’re dealing with, and get a straight answer: fix it yourself, schedule a regular appointment, or call for emergency service.
CTA: In an emergency, call us directly for immediate service in Kanata, Stittsville, and across Ottawa. If you’re not sure whether your situation is an emergency, a quick Virtual Plumber call can help you assess the severity and decide on the right next step.