Fifteen years ago, diagnosing a clogged main drain in Pointe-aux-Trembles meant digging up the yard. Excavator, $4,000 to $8,000 of work, three days without toilets. Today, a 2 cm inspection camera travels 30 meters of pipe in 45 minutes, tells us exactly where the problem lives, and often lets us avoid excavation entirely.
Here's the tool that changed diagnostic plumbing, when a camera inspection is actually worth it, what we look for in the image, and how to read the report we hand you — without getting sold work you don't need.
1. What is a camera inspection, concretely?
A waterproof camera, usually 25 mm in diameter, mounted on a flexible cable 30 to 60 meters long. It enters through an access point (existing cleanout, pulled toilet, access cap) and travels up or down the drain, filming in real time. A built-in radio transmitter lets us locate the camera's position precisely from the surface — within 15 cm, even 3 meters under slab.
The image displays on a screen in the van, and gets recorded to video. At the end, you receive the file — USB drive or private download link.
2. The 5 situations where it's truly worth the money
- Home purchase (pre-buy inspection). Cast-iron pipes in pre-1970 houses, clay tile joints, old aggregate drains: everything a standard home inspection doesn't see. A cracked drain you can't see can kill a deal or buy you negotiating leverage.
- Chronically slow main drain that clogs every 6-12 months. It's rarely about "misuse." It's almost always mechanical: sag, roots, fracture, belly.
- After major water damage to document cause for your insurer. Timestamped video evidence strengthens a claim.
- Before installing a backwater valve to identify the optimal install point.
- Diagnosing sewer sounds, odors, repeat backups. When no other tool gives a clear answer.
3. What we look for in the image
An experienced plumber looks for six specific things:
- Pipe material: cast iron, PVC, ABS, vitrified clay, copper, lead. Each has its lifespan and typical failures.
- Tree roots: white or reddish filaments hanging in the pipe, almost always at joints. Signal entry through a crack — roots come in, they don't leave.
- Belly (sag): pipe dipping where water stagnates. Visible as a puddle at the bottom. Primary cause of chronic clogs. Requires digging to re-level.
- Cracks and fractures: dark lines crossing the pipe. Small crack = spot repair; longitudinal crack = section replacement.
- Joint misalignment: old clay pipes are often offset at joints. Entry point for roots, exit point for water.
- Scale or grease buildup: brownish or whitish coating reducing usable diameter. Clears via hydrojet — far more effective than traditional snake.
4. How to read the report you're given
A professional camera inspection report always contains:
- Complete timestamped video of the camera's round trip
- Screenshots of each problem area, with measured distance from entry point (e.g., "crack at 7.2 m")
- Scale diagram of the path with located issues
- Tiered recommendations — what's urgent, what can wait, what needs watching
- Price range for each repair option
A good report always separates urgent from preventive. If a contractor presents everything as critical and pushes you to dig immediately, get a second opinion. Cracked drains don't get fixed at 11 PM on a Saturday.
5. When camera inspection is NOT needed
Save yourself the $500 when:
- Only one drain is slow (kitchen sink, bathtub) — it's localized, a simple unclog will do
- First main-drain clog in several years — a snake or hydrojet solves 85% of cases
- New construction under 15 years with no symptoms — defect probability is low
- You already had an inspection done within the last 2 years with no change
6. 2026 Montreal prices
- Standard camera inspection (main drain): $350 to $550
- Full inspection (main drain + branch lines): $550 to $750
- Pre-purchase inspection with signed detailed report: $500 to $800
- Precise defect location (with radio locator): +$150 to $250
- Urgent after-hours inspection: +$200 to $350 surcharge
Practical tip: many contractors offer free camera inspection if you do the work with them. Tempting, but it creates an obvious bias — the contractor is incentivized to find problems. For a pre-purchase inspection or independent diagnosis, pay the full invoice and keep the video. You can then shop around for repairs.
7. What happens AFTER the inspection
Depending on findings, three paths:
- Hydrojet cleaning for fine roots or grease. Solves 50% of cases seen on camera. $450 to $900 depending on complexity.
- Pipe lining without digging: we insert a resin sleeve inside the existing pipe that cures in place. Excellent for cast-iron cracks. $250 to $500 per linear meter. Requires host pipe in at least minimal shape.
- Excavation and section replacement: only option for belly, major misalignment, or collapsed pipe. $5,000 to $18,000 depending on depth and access. This is where a good camera report saves you money — we dig the exact right meter, not the whole yard.
8. Why the camera changed the trade
Before, a plumber arrived, probed, guessed, proposed work blind. Today, we show you the image, explain, you decide. More transparent, cheaper for you, and it reduces "mystery clogs" that came back every six months — because we finally find the cause, not just the symptom.
For problems that don't show on camera (leaks behind walls, invisible moisture), see our guide on the 9 signs of a hidden leak. For after-hours emergencies, our night emergency guide covers the 7 moves to make before the plumber arrives.
Summary
- Camera inspection often replaces blind excavation
- Especially justified for buying a house over 40 years old
- A good report contains video + diagram + tiered recommendations
- Be wary of "free" inspections offered by the same crew who'll do the work
- The tool doesn't replace judgment — demand a certified plumber who explains what they see
Plomberie PSF runs a professional inspection camera with locator transmitter and same-day timestamped video report. Over ten years filming drains across Greater Montreal. (514) 655-6560 or book through our contact form — objective diagnosis, no sales pressure.