Quickly Identify Hidden Leaks
Smoke Test for Plumbing Systems in Montreal
Quickly identify hidden sewer gas leaks, odours, rodent entry and drain deficiencies with professional smoke testing!
At Plomberie Urgence Montréal, we offer a fast, reliable, and non-invasive diagnostic method to detect hidden leaks, odours, and even rodent access points in residential, commercial, and multi-unit plumbing systems. If you’re experiencing persistent smells, moisture, or signs of pest intrusion, a smoke test is the most effective way to find the problem — even when it’s not visible or accessible.

What is a Smoke Test?
A smoke test involves introducing non-toxic, artificial smoke into your drain or plumbing system using a specialized smoke machine. The smoke travels through your pipes and will escape through any cracks, disconnected vents, broken seals, or dry traps — instantly revealing the source of the problem.
It’s commonly used to detect:
- Sewer gas odours or air leaks
- Unidentified water entry points
- Improper or damaged venting
- Rodent entry points from the drain system
- Breaks or cracks in main sewer lines
Why You Might Need a Smoke Test
- Persistent smell of sewage or musty odour inside
- Rodent or pest activity suspected to be coming from drains
- Gurgling or bubbling sounds from toilets and sinks
- Unexplained moisture, mould, or water damage
- Ongoing drain issues despite previous repairs
- Concerns after renovations or water damage incidents
- If you suspect that rats or mice are entering through broken sewer pipes or open connections, a smoke test can help confirm this by visually exposing the entry point — especially in basements, mechanical rooms, or common walls.
What Happens After the Test?
Depending on what we find with the smoke test, our licensed plumbers are ready to take action right away:
- If the issue is a disconnected or damaged vent inside a wall or in the attic, we can open the drywall or access the attic space to perform the repair immediately, with your approval.
- If smoke reveals a crack or break in your main drain line, we may recommend a camera inspection to further evaluate the condition and location of the problem. We’ll then provide you with a detailed estimate for the corrective work required.
- If the issue involves minor drainage concerns or sealing problems, we can often fix them during the same visit.

Why Choose Smoke Testing?
- Pinpoint Accuracy: No guesswork — you see exactly where the problem is.
- Non-Invasive: No major demolition or water pipe digging to diagnose the issue.
- Time-Saving: Get answers in less than 2 hours.
- Insurance-Approved: Excellent documentation for claims involving water damage, odours, or pest intrusion.
- Safe for Homes & Buildings: The smoke is non-toxic, odourless, and disappears quickly after testing.
Professional Smoke Test
Serving Montreal & Surrounding Areas
We proudly serve homeowners, building managers, and businesses across Montreal, Laval, the South Shore, and the North Shore. Whether you’re in Plateau-Mont-Royal, Ahuntsic, Saint-Léonard or Ville-Marie, our experienced team is ready to respond and investigate your plumbing system with precision.
We operate 7 days a week, with emergency service available 24/7 when urgent diagnosis is needed.
Sewer gas, bad odours, or rodents shouldn’t be ignored. Let us identify the root of the problem and help you fix it right — the first time.
Call Plomberie Urgence Montréal at 514-418-3535 or email [email protected] to schedule your smoke test or speak with a licensed plumber.