Acoustic Leak Detection in BC

What is acoustic leak detection?

Acoustic leak detection is the practice of locating a pressurized water leak by listening to the sound it produces. Water escaping from a pressurized line creates a steady high-frequency hiss or thrumming noise as it forces through a fracture, fitting, or pinhole. That sound travels through pipe walls and surrounding materials — concrete, soil, drywall, framing — and can be picked up at the surface with calibrated sensors. By moving those sensors along the suspected line and listening for where the signal peaks, an experienced tech can mark the leak location within a few inches before anyone opens a wall or breaks ground.

It’s the workhorse method for the most common residential and commercial leaks in British Columbia: slab leaks under living rooms and kitchens, wall leaks on supply lines feeding bathrooms and laundry rooms, irrigation main breaks on golf courses and large landscaping, and service line leaks between the city shut-off and the home. Done right, it saves homeowners and property managers thousands of dollars in unnecessary demolition and gets repair crews to the exact spot on the first try.

AnyLeak has run acoustic detection across BC for 25+ years — from heritage homes in West Vancouver to multi-unit strata in Burnaby to industrial sites in the Fraser Valley. The fundamentals haven’t changed; the equipment has, and we keep ours current.

How acoustic detection works

The physics: water under pressure makes noise

When a pressurized water line develops a leak, the pressure differential between the inside of the pipe (typically 40–80 psi in residential systems, higher in commercial) and the surrounding environment causes water to accelerate through the fracture. That acceleration creates turbulence, and turbulence creates sound — specifically, a continuous broadband noise with peaks in the 200–5,000 Hz range depending on pipe material, fracture geometry, and line pressure.

That sound propagates in two directions. Through the pipe wall, it travels along the line itself like a tuning fork — sometimes for tens of metres. Through the surrounding material (concrete slab, soil, building structure), it radiates outward with rapidly diminishing intensity. The point where surface intensity peaks corresponds, almost without exception, to the location directly above the leak.

What the sensors hear

Modern acoustic detection uses two main sensor types. Geophones are placed on hard surfaces (slabs, sidewalks, asphalt) and pick up vibration. Ground microphones pick up airborne sound where the surface allows — landscaping, grass, gravel. Both feed into an electronic amplifier and filter, which lets the tech isolate the leak frequency range and reject ambient noise like traffic, HVAC, or appliances running in the home.

When the tech walks the suspected line, the amplifier shows a real-time signal level. The leak location is wherever that signal peaks. To confirm, we use two-point correlation: place sensors at known points along the pipe, measure the time difference between when the leak sound arrives at each, and the math tells us the exact distance from each sensor to the source. It eliminates guesswork on long runs.

What about quiet leaks?

Not every leak is loud. Slow seeps, low-pressure systems, and depressurized lines can produce so little sound that acoustic alone won’t locate them. When that happens, we don’t force the method — we switch to electronic tracer gas detection or thermal imaging, both of which find leaks acoustic can’t. Knowing when to switch methods is the part that takes experience.

When acoustic detection is the right call

Acoustic is the first method we reach for when any of these symptoms are present:

• A water bill that jumped without explanation. Most often the cause is a small continuous leak on a pressurized supply line. Acoustic finds these because the leak runs continuously and pressurized, producing a stable signal.
• Damp spots, warm spots, or warped flooring on a slab-on-grade home. Classic slab-leak symptoms. The line is under concrete; acoustic listens through the slab.
• Persistent moisture at the base of an interior wall. A supply line in the wall is leaking. Acoustic walks the wall and pinpoints the spot before the drywall comes off.
• Loss of pressure on an irrigation system without visible surface water. The break is underground, possibly under a driveway or planted bed. Acoustic combined with line-tracing equipment finds it.
• Strata mainline pressure drop. Multi-unit buildings with shared supply lines. We isolate zones and listen on each.
• Pool, spa, or hot tub losing water. Pressurized return lines are the usual culprit. Acoustic is the first pass.
• Hot-water recirculation loop pressure loss. Common in larger homes and commercial buildings.

Acoustic is not the right call when the leak is on a depressurized line (waste drains, vents), when the leak is suspected to be in a roof membrane, or when temperature differential is the most reliable signal (radiant heat lines). For those scenarios we deploy electronic detection, thermal imaging, or our combined pressure and tracer gas method.

Real-world examples from BC properties

Slab leak under a North Vancouver kitchen

Homeowner reported a steadily warm spot on the kitchen tile and a water bill that doubled month over month. The home was on a slab foundation, the kitchen had been renovated 8 years prior, and the warm spot suggested a hot-water supply line under the concrete. We arrived with both geophones and a correlator. Two passes across the floor placed the leak under the south corner of the island, roughly 2.5 metres from the exterior wall. We marked the spot. The repair plumber opened a 14×14 inch square of tile and concrete, found the leak exactly where we marked, repaired the 3/4″ copper line, and re-poured. Total damage to the kitchen: a small section of tile. Without acoustic, the typical approach would have been to open the entire kitchen floor and chase the line by sight.

Mainline break under a Surrey driveway

Property manager noticed a wet spot at the curb that wouldn’t dry even on a hot week. Water bill was up about 30%. The service line from the city shut-off ran under a recently paved driveway, so digging up the entire run was a non-starter. We pressurized the line and used surface microphones combined with a tracer line to walk the path. The peak signal was 1.2 metres from the garage door at a depth of about 60 cm. The repair crew dug a 1×1 metre hole, found a fracture in the polyethylene service line, replaced the damaged section, and backfilled. The driveway above stayed intact. Total cost was a fraction of what trenching the full driveway would have been.

Strata mainline in a Burnaby high-rise

Strata council reported pressure complaints from units on the 14th and 15th floors and an unexplained make-up water draw on the boiler loop. The 16-storey building had a recirculating hot-water loop with multiple risers. We worked floor by floor with the building’s engineer, isolating risers and listening at known fittings. The leak was identified at a riser elbow between the 13th and 14th floors. The repair was a single fitting replacement in a service shaft, no unit access required. The council booked us specifically for the insurance-ready report, which was accepted on first submission.

Our process, step by step

1. Free phone consult. You call (604) 269-5325. We ask about the property, the symptoms, how long they’ve been showing, and whether anything has been opened up already. By the end of the call we’ll usually tell you whether acoustic alone is enough or whether we’ll bring tracer gas too — and an honest time and cost estimate.
2. Site arrival and walkthrough. The tech arrives in a marked van with all equipment. We walk the property with you, look at the symptom areas, ask about plumbing history, and identify which lines need to be isolated.
3. Isolation. We shut off appliances, water-using fixtures, and zone valves where applicable, so only the line we’re testing is pressurized. This is the single biggest factor in accurate acoustic readings.
4. Scan and mark. Geophones or ground microphones move along the suspected line. The amplifier reads signal strength; the tech listens and watches. Peak signal location gets a temporary mark.
5. Triangulation and verification. For longer runs, we set up two-point correlation. Two sensors, known distance apart, time delay between them tells us exactly where on the line the source is. We confirm by re-scanning.
6. Documentation. Photos of the marked location, sketch of the line layout, equipment readings if helpful for insurance. The technician writes up the report on the spot or sends it shortly after the visit.
7. Handoff. If you have a repair contractor, we coordinate with them. If you don’t, we can refer trusted plumbers who’ve worked from our reports before.

The equipment we use

Acoustic detection lives or dies by the gear, and we keep ours current. Our standard kit:

• Electronic amplifier/filter unit with adjustable frequency bands so we can match the leak signature to pipe material.
• Geophone array for hard surfaces — multiple sensor heads to cover slab and concrete environments efficiently.
• Ground microphone with windscreen for landscaping, gravel, asphalt, and outdoor scans.
• Two-channel correlator for long-run triangulation, especially on service lines and irrigation mainlines.
• Line tracer for buried lines — locates the pipe path before we listen for the leak on it.
• Pressure gauges for verifying line pressure before, during, and after the scan.
• Backup tracer gas kit in case acoustic doesn’t resolve the leak and we need to switch to electronic detection on the spot.

Every tech is trained on the full kit. Nothing learned on the job at your property.

Cost & our “no detection, no charge” policy

Acoustic detection pricing depends on three things: property size, system complexity (single-family home vs strata vs commercial), and how long it takes to isolate and locate. We’ll give you a transparent quote on the phone before we dispatch, and we don’t play games with add-on fees.

Our policy on every detection job — acoustic or any other method — is simple: if we can’t locate the leak, you don’t pay for the visit. We’ve earned that policy by finding the leaks other companies couldn’t for 25+ years. It also means there’s no risk to you in calling us.

Service areas across BC

We provide this service across British Columbia. Priority booking across Greater Vancouver and the Fraser Valley — Vancouver, North Vancouver, West Vancouver, Burnaby, Surrey, Richmond, Coquitlam, Delta, Langley, Abbotsford, Chilliwack, Victoria, Nanaimo, Kelowna, Kamloops, and the rest of our BC service area.

Frequently asked questions about acoustic leak detection

Related detection methods

Acoustic is one of six methods we deploy. Often we combine methods on a single job to confirm a difficult find. Read about the others:

• Thermal imaging — finds hidden moisture and hot-water leaks by temperature differential.
• Electronic detection — tracer gas and electronic sensors for radiant heat, roofing membranes, depressurized lines.
• Underground detection — ground-penetrating radar and correlation for buried mainlines.
• Drone inspection — aerial thermal scans for large commercial roofs and facilities.
• Pressure & tracer gas — combined method for complex multi-zone systems where standard methods fall short.