A spike in your water bill, a damp patch on the wall, or the sound of running water when everything's off? Our licensed plumbers pinpoint hidden leaks with acoustic and thermal equipment — finding the exact spot before any wall, floor, or yard gets torn up.
A hidden water leak can run for weeks behind a wall, under a slab, or out in the yard before you ever see it — quietly driving up your bill and damaging your home. ExpressFlow Plumbers St. Catharines uses non-invasive water leak detection to find the exact source fast, without needless digging or demolition. If you've searched for leak detection near me, our licensed plumbers can pinpoint the problem and lay out your options the same day.
Why a Hidden Leak Won't Wait
Left alone, even a slow leak does real damage. Constant moisture rots framing, warps flooring, and feeds mould that can affect the air you breathe — while water you never use keeps showing up on every bill.
The tricky part is that most serious leaks are completely out of sight: inside walls, beneath the foundation, or buried in the yard. That's exactly why professional detection matters — we find it precisely, so the fix stays small.
The Leaks We Find and Fix
Water can escape almost anywhere in a home's plumbing. Our leak detection covers every common source across St. Catharines:
Slab Leaks
Leaks in the pipes beneath your concrete foundation, often showing up as warm floors or a spiking bill.
Wall & Ceiling Leaks
Pinhole leaks and drips hidden behind drywall that leave stains, bubbling paint, or damp patches.
Underground & Water Line Leaks
Leaks in the buried service line, spotted as soggy lawn, low pressure, or a meter that keeps running.
Pool, Spa & Irrigation Leaks
Water loss in outdoor plumbing, pool returns, and sprinkler lines that's easy to overlook.
Signs You Have a Hidden Water Leak
An unexplained jump in your water bill
Damp spots, stains, or bubbling paint
A musty smell or patches of mould
The sound of running water when taps are off
Warm spots underfoot on the floor
A water meter that moves with everything off
Weak or dropping water pressure
Cracks or shifting in floors and walls
The Technology Behind Precise Leak Detection
Guesswork leads to torn-up walls and floors. Instead, we combine several proven methods to zero in on a leak without opening anything unnecessarily:
✓ Acoustic listening equipment that hears leaks through floors and walls
✓ Thermal imaging cameras that reveal temperature changes from escaping water
✓ Pressure testing to confirm exactly which line is leaking
✓ Moisture meters and tracer gas for the hard-to-reach spots
Together, these tools let us locate a hidden leak to within a small area — so any repair is targeted, tidy, and far less disruptive.
How Our Leak Detection Service Works
Finding a leak should be calm and methodical, not a demolition project. Here's what to expect from start to finish:
1
Describe the Symptoms
We start with what you've noticed — the bill, the damp spot, the sound of running water.
2
Non-Invasive Inspection
We scan the area with acoustic and thermal equipment — no digging or cutting to start.
3
Pinpoint & Mark
We locate the exact leak and mark the spot, usually within a small, contained area.
4
Report & Repair Options
You get a clear findings report and straightforward options to fix it, with no pressure.
24/7 Emergency Response
Emergency Leak Detection Near You
When water is actively pooling, dripping through a ceiling, or gushing behind a wall, every minute counts. Our St. Catharines plumbers respond fast to find the source, stop the flow, and protect your home from spreading water damage — day or night.
Why St. Catharines Homeowners Trust Our Leak Detection Team
Finding a leak you can't see takes the right tools and real experience. When you want a leak detection plumber near you who gets it right without tearing the place apart, here's why homeowners call us:
45,000+ jobs completedThousands of verified reviewsBased in St. Catharines
Non-Invasive First
We find the leak with sound and thermal tools before anything gets opened up.
Licensed & Insured Plumbers
Qualified local pros who handle both the detection and the repair that follows.
Fast, Same-Day Response
Hidden leaks waste water by the hour, so we aim to get out to you quickly.
Accurate to the Spot
We mark the exact location, so the repair stays small and targeted.
Talk to a Local Leak Detection Plumber
Suspect a leak but can't find it? Don't wait for the damage to spread. When you need a leak detection plumber near you, we'll come out, track down the source without the mess, and walk you through exactly what we find.
Fill out the form and a local plumber will get right back to you.
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Leak Detection Reviews · St. Catharines
What St. Catharines Homeowners Say About Our Leak Detection
Hidden leaks are stressful — here's what a few neighbours had to say after we tracked theirs down and put their minds at ease.
"Water bill kept climbing and we couldn't see any leak anywhere. They came out, listened around with their equipment, and found it under the kitchen floor within an hour. No jackhammering the whole slab."
WK
Warren K.
2026-01-16
★★★★★
"Had a damp spot spreading on the ceiling and assumed the worst. Turned out to be a small pinhole leak behind the wall. They pinpointed it exactly, so only one small section had to be opened up."
MJ
Melissa J.
2026-02-04
★★★★★
"We could hear water running at night even with everything shut off. They traced it to a slab leak with a thermal camera and marked the exact spot. Saved us from tearing up half the basement."
CB
Curtis B.
2026-02-23
★★★★★
"Our lawn had one patch that was always soggy. They located an underground leak on the line without digging the whole yard up. Quick, clean, and they explained everything as they went."
YD
Yvonne D.
2026-03-11
★★★★★
"Pool was losing water and we couldn't figure out where. They tested the plumbing and found a leak in the return line. Really knew what they were doing, and no guessing about it."
AM
Andre M.
2026-03-29
★★★★★
"Smelled something musty in the closet and found the drywall was damp. They found the hidden leak fast and pointed us in the right direction for the repair. Professional and tidy the whole time."
