Direct Answer
AnyLeak provides leak and moisture detection services in British Columbia using non-invasive methods — acoustic correlation, tracer gas, thermal imaging, and moisture metering — to find leaks without digging or damage. Every inspection includes a written, insurance-ready report. Call (604) 269-5325 for a free phone consult.
🔄 Reviewed and maintained by the AnyLeak team — October 2026. Rated 5 stars by BC customers.
Underground Leak Detection in BC
Find buried water mainlines, service lines, and irrigation breaks without trenching the property. We combine ground-penetrating radar, correlation acoustics, line tracing, and tracer gas to mark leaks from the surface — turning what would be a property-wide excavation into a small, precise repair.
What is underground leak detection?
Underground leak detection is the practice of finding leaks in buried pipes — service lines from the city water main to the building, irrigation mainlines and laterals, swimming pool and hot tub supply lines under decks, and commercial site water systems — without digging up the ground to look for them. It combines several technologies: correlation acoustics (specialized acoustic detection adapted for buried pipes), ground-penetrating radar (GPR), line tracing, and tracer gas. The right combination depends on the pipe material, depth, surface conditions, and what’s above the pipe (lawn, driveway, sidewalk, planting bed).
The reason underground detection matters so much in BC: replacing a buried supply line is one of the most expensive plumbing repairs a homeowner can face, and the bulk of the cost is usually the excavation, not the pipe. Finding the exact leak point so a small repair hole can be opened — instead of trenching the entire run from house to street — routinely saves homeowners between $5,000 and $20,000 in landscaping, paving, and labour.
AnyLeak has located buried leaks across BC for 25+ years, from suburban service lines in Surrey to golf course irrigation in the Okanagan to commercial mainlines on industrial properties in the Fraser Valley. The methods are the same; the experience reading the signals is what makes them practical.
How underground detection works
Correlation acoustics: hearing through soil and concrete
The same acoustic principle that finds leaks in walls and slabs — pressurized water makes noise — applies underground, with adaptations. Buried pipes carry leak sound surprisingly well along their own length; the sound dissipates much faster when it has to travel through soil. So we place two specialized acoustic sensors at known points on the pipe (often at hydrants, valve boxes, or excavated access points). The leak sound arrives at each sensor at a slightly different time depending on how far the leak is from each. A two-channel correlator measures that time difference and computes the leak’s position along the line with high precision.
Ground-penetrating radar (GPR)
GPR sends a radar pulse into the ground from a surface antenna. The pulse reflects off subsurface objects — pipes, rocks, voids, saturated soil — and the time-and-strength of the return signal tells the operator what’s down there and how deep. For leak detection, GPR helps in two ways: locating the pipe’s path when records are incomplete, and identifying saturated soil zones that suggest active leakage. It’s especially useful under driveways and paved areas where line tracing alone might be limited.
Line tracing
Many buried metallic pipes can be located by inducing a tone signal on the pipe and walking the surface above with a receiver. For non-metallic pipes (PVC, PEX, polyethylene), we use a sonde — a small transmitter pushed into the line — or trace the pipe with a flexible camera. Line tracing turns “unknown buried run” into “known path on the surface,” which is the prerequisite for placing acoustic sensors accurately.
Tracer gas underground
The tracer gas method we use for electronic detection indoors works just as well underground. Drain the line, pressurize with H2/N2 mixture, walk the surface with the detector. Wherever gas escapes, it migrates upward through soil and concentrates at the surface above the leak. It’s especially useful for shallow service lines and irrigation runs.
When underground detection is the right call
- Service line leak between the city shut-off and the building. The single most common buried leak. Often shows as a wet patch in the lawn or driveway, an unexplained water bill jump, or a meter that registers consumption with all fixtures off.
- Irrigation mainline or zone leak. Pressure drop, sodden zones, or visible surface water. Especially important on golf courses and large landscaping where digging up the wrong section is costly.
- Pool or spa supply line under concrete decking. Pool losing water beyond evaporation, no visible leak in the pool itself. The leak is in the buried supply or return line.
- Commercial site water mainline. Industrial properties with long buried runs — warehouse complexes, manufacturing, multi-building campuses.
- Hidden leak under a driveway, walkway, or patio. Wet spots that won’t dry, frost heave in winter, or unexplained subsidence.
- Strata buried mainline shared between buildings. Multi-building strata with underground site plumbing.
Real-world examples from BC properties
Service line under a Coquitlam driveway
Homeowner noticed a soft spot in the driveway that wouldn’t dry even on warm weeks. Water bill was up roughly $80 per month. The service line ran from the city shut-off at the property line under a 12-metre paved driveway. Replacing the entire line would have meant tearing up the entire driveway. We pressurized the line and used correlation acoustics with sensors at the meter and at the house entry. The correlator placed the leak 4.2 metres from the meter, just past the curb. Repair excavation was a 1×1 metre hole, line was repaired, hole was patched. Driveway above stayed intact.
Golf course irrigation leak in the Okanagan
Course superintendent noticed pressure loss on a 12-zone irrigation system and a visible wet zone on the third fairway. The mainline ran under 200 metres of fairway from the pump house. We line-traced the main, placed correlator sensors at two known valve boxes, and ran a pressurization cycle. The correlator placed the leak 73 metres from the pump house, near a tree. Excavation found a fractured 4″ PVC line that had been damaged by root intrusion. Repair was a 2-metre line section; the rest of the fairway stayed in play.
Hidden mainline at a Vancouver Island commercial property
Industrial property reported a water bill increase of about 200% with no obvious surface symptoms. The site had three buildings connected by a buried mainline running about 80 metres total. We pressurized the line and combined correlation acoustics with tracer gas. The correlator narrowed to a 5-metre stretch; the gas detector pinpointed within 30 cm. Excavation found a galvanized pipe section that had corroded through. Repair was a single fitting replacement; entire mainline didn’t need to be replaced.
Our process, step by step
- Free phone consult. (604) 269-5325. We’ll ask about line type, age, depth, what’s above (lawn, driveway, etc.), and symptom history. We’ll tell you the methods we’d use and an estimate.
- Site arrival and walkthrough. We identify the pipe’s entry and exit points, look at any visible symptoms, and confirm system shut-offs.
- Line tracing. If we don’t have a known path, we trace it — signal injection for metallic pipes, sonde or camera for non-metallic.
- Sensor placement. Two acoustic correlator sensors at known points on the line.
- Pressurization and listening. System is pressurized to operating pressure; correlator runs.
- Secondary verification. Tracer gas or GPR confirms the marked location, especially for important infrastructure.
- Marking and reporting. Surface mark with measurements from known landmarks. Full report with methodology, photos, recommendations.
- Excavation coordination. If you have a contractor, we communicate the exact location. If not, we can refer trusted excavators.
Equipment for buried lines
- Two-channel acoustic correlator with high-sensitivity sensors for hard surfaces and soil.
- Ground-penetrating radar (GPR) for path identification and saturated-soil mapping.
- Line tracer with signal generator for metallic pipes; sonde transmitter for non-metallic.
- Hydrogen tracer gas kit as secondary verification.
- Pressure gauges and isolation valves for system control.
- Surface marking tools — spray paint, flags, measurement from known landmarks.
Cost & our “no detection, no charge” policy
Underground detection visits typically run longer than indoor work because of setup and line tracing — budget 3–6 hours for a typical residential service line job, longer for commercial and irrigation. The cost is small compared to the alternative: excavating the entire line to find the leak by sight. We’ve seen homeowners spend $15,000+ on a property-wide trench when a $500–$1,500 detection visit would have saved most of that.
No detection, no charge applies to underground work too. Call (604) 269-5325 for a quote.
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 underground leak detection
Can you find a buried leak without digging up the property?
What kinds of buried leaks do you find most often?
How deep can you detect?
Do you need to know where the pipe runs first?
Will you cut into a driveway or walkway to find the leak?
Can underground leaks be found in winter or wet weather?
How much does underground leak detection cost?
Got a leak? Talk to a underground detection expert.
Free phone consult. No pressure. Priority booking across Greater Vancouver and the Fraser Valley.
A Closer Look at This Service
The cost of finding a leak is small compared to the cost of the damage it causes. A month of undetected leaking can wet insulation, rot framing, wash soil, and attract mould in the time it takes to book an inspection.
The best detection work is done by people who have seen the region’s buildings and buried systems fail in every common way. That experience is what turns a set of readings into a confident, cross-verified answer.
The technician works methodically through the checklist, explaining each step as it happens. Questions are welcome at every stage, and the approach is adjusted when the evidence points in a new direction.
How the Investigation Is Delivered
Every investigation follows the same disciplined sequence: consultation, survey, testing, cross-verification, marking, and documentation. The sequence is deliberate, and each step builds on the last.
- Step 1: Consultation to understand the situation and the history
- Step 2: Site survey and indicator mapping
- Step 3: Testing of the suspected systems with matched methods
- Step 4: Cross-verification of the finding
- Step 5: Marking and documentation
- Step 6: Written, dated report
The most common mistake is waiting: waiting for the stain to dry, waiting for the bill to settle, waiting for the leak to announce itself. Water does not wait, and every week of waiting grows the repair scope.
What This Costs
Pricing for this service in British Columbia depends on the scope of the investigation: the systems to be tested, the size of the property, and whether the finding is confirmed with a second method. A fixed quote is provided before any work begins, so there are no surprises on the invoice.
Every property is different, which is why pricing follows the investigation plan rather than a menu. The free consultation defines the scope, and the fixed quote follows it. What you are quoted is what you pay.
Insurance and Documentation
Insurance claims fail most often because of missing documentation. A dated, photographed, method-by-method report removes that failure point and gives the adjuster a professional document they can rely on.
For BC policyholders, the practical value is speed: the claim starts with the report already in hand, instead of weeks of back-and-forth while the insurer tries to establish what happened.
What the Report Includes
The report is written in plain language first and professional language second. Owners read the conclusion and the cause; contractors and adjusters read the method notes and the readings. Both are in the same document.
The report is written in plain language first and professional language second. Owners read the conclusion and the cause; contractors and adjusters read the method notes and the readings. Both are in the same document.
When to Call
Call when a decision needs documentation: an insurance claim, a real estate transaction, a strata dispute, or a warranty process. Those decisions run on evidence, and the evidence has to exist before the deadline.
Call when the indicator is persistent, when it repeats after a repair, or when it is accompanied by a second indicator. A single passing event can be a coincidence; a pattern is a leak.
How to Prepare the Property
If there is an active leak, the priority is containment: shut off the water at the fixture or main if it can be done safely, move valuables away, and photograph the scene. The technician can be guided by phone while en route.
If there is an active leak, the priority is containment: shut off the water at the fixture or main if it can be done safely, move valuables away, and photograph the scene. The technician can be guided by phone while en route.
Common Questions
Is this service non-invasive?
Yes. Every method used works from the surface and leaves no marks. Nothing is cut, dug, or permanently marked during the investigation.
How accurate is the location?
With cross-verified methods, locations are typically within a metre or less, and slab locations within inches.
Is the report useful for insurance?
Yes. The report documents the cause, the extent, the methods used, and the readings, structured for claims and engineering review.
How long does an investigation take?
Most property-level investigations complete within a day, and the written report follows within one to two business days.
Do you repair leaks?
No. Detection and documentation are the service. The report guides the repair contractor to the exact location.
What does this cost?
The quote is fixed before work begins, based on the scope defined in the free consultation. What you are quoted is what you pay.
Call (604) 269-5325 or email info@anyleak.ca for a free consultation. The report is dated, documented, and written to the standard insurers and engineers expect.
★★★★★
"Our flat roof developed a leak, and Anyleak responded quickly. They completed a temporary repair right away."
Sorin Silivestru
Google Review
Why choose a specialist for Underground Leak Detection in BC
Underground leak detection locates buried service-line and main-line leaks with ground microphones, correlators and line tracing — so excavation is targeted, not exploratory.
- Leak detection specialists in British Columbia since 1999 — not a plumbing sideline.
- Non-invasive methods first, so access is limited to the leak itself.
- A clear written report you can act on or hand to your insurer.
- Straight answers and up-front pricing — call (604) 269-5325.
Underground Leak Detection in BC — common questions
How do I choose the best underground leak detection company in BC?
Choose a team that traces the line first and correlates the leak between two points instead of digging test holes. Accurate location is the entire value of the service.
Can you find a leak on the buried service line to my property?
Yes — we trace the service line from the meter to the building and correlate the leak position, usually to within about a metre.
Do you locate the pipe before finding the leak?
Yes. We map the line’s route and depth first, which makes the leak location far more reliable and keeps any digging small.
The Underground Detection Family
Buried-water work runs deeper than one method — explore the full practice: