Municipal Water Mains · Network surveys
Acoustic Water Main Leak Survey for BC utilities.
Systematic acoustic survey of municipal distribution networks — correlators, ground microphones, and listening points worked block by block until every leak on the route list has a paint mark and a record. The backbone method of every serious water loss program since long before anything flew.
Free phone consult · No pressure · Mon–Sat 8am–6pm PT
Why utilities choose it
- Finds the quiet leaks that never surface — the majority
- Pinpoint accuracy that turns repairs into single excavations
- Survey records build a defensible asset-management file
- Crews, correlators, and interpretation under one roof
Built for
How it runs
- 1
Route planning
System maps, pipe materials and diameters, valve and hydrant inventory, and any loss data set the survey routes — metallic mains, AC, and PVC each get sensor spacing and methods matched to how far leak noise actually travels in them.
- 2
Systematic listening
Crews work contact point to contact point — hydrants, valves, services — logging acoustic levels and flagging points of interest. Quiet hours are used where traffic noise demands it; scheduling is built around your community, Mon–Sat.
- 3
Correlation & pinpointing
Points of interest get correlated: sensors bracket the suspect span, the processor times the leak noise arriving at each, and the position falls out of the velocity math. Ground microphone verification walks the final metres to a paint mark.
- 4
Survey deliverable
Every confirmed leak documented with location, suspected pipe section, acoustic evidence, and severity ranking — plus the clean-route record that proves the rest of the system listened tight. GIS-ready on request.
Ground crews + aerial screening, one company
Leak.ca has pinpointed BC water leaks on the ground since 1999 — and now screens whole corridors from the air first when the network scale justifies it. Our drone thermal water main survey ranks kilometres into suspect zones; the crews on this page turn those zones into paint marks. One accountable program from flight to dig sheet — see the full municipal water main hub.
Utilities ask
How does acoustic correlation actually locate a buried leak?
A pressurised leak makes continuous noise that travels along the pipe wall and water column. Two sensors placed on accessible contact points either side of the suspect span — hydrants, valves — both hear it, but the nearer one hears it first. The correlator measures that time difference, and with the pipe material, diameter, and distance between sensors, computes the leak position. On metallic mains, well-executed correlation routinely lands within half a metre.
Does it work on PVC and asbestos-cement mains — half of BC's stock?
Yes, with adjusted technique and honest expectations. Plastic and AC pipe attenuate the higher frequencies correlators love, so leak noise travels shorter distances — we tighten sensor spacing, lean on lower-frequency sensing and ground microphones, and accept that some quiet PVC leaks need a second pass under better pressure or night conditions. Crews that only ever surveyed cast iron get humbled by PVC; ours have worked BC's mixed stock since 1999.
How much of the system can you survey, and how fast?
A crew typically covers several kilometres of distribution main per day depending on contact-point density, traffic noise, and how many points of interest demand correlation. A small municipality's whole system fits in a survey season; larger systems usually run rolling programs — a third of the network per year — or target zones flagged by metering or our aerial thermal screening.
When is the best time to survey — and do you work nights?
Leak noise competes with demand noise and traffic. Low-demand windows give the cleanest data, and for downtown cores or arterial routes night work is sometimes the honest answer — we schedule it where the data quality requires it. System pressure matters too: surveys time around reservoir cycles where pressure swings are large.
Related municipal services
Leak Noise Logger Programs
Noise loggers deployed across the network — magnetically mounted in valve chambers and on hydrants, listening through the quiet hours night after night. Lift-and-shift campaigns or permanent coverage, with every point of interest ranked before a crew ever mobilises to correlate.
View serviceWater Main Break Location
Water is up through the pavement on 4th Avenue — but the break is rarely under the puddle. Precise location of active main breaks before the excavator arrives: one hole, the right hole, with the road closed for hours instead of days.
View serviceStep Testing & Zone Isolation
Close valves in a planned sequence, watch the zone meter, and the leak tells you which segment it lives in. Step testing is the old, unglamorous, devastatingly effective way to shrink a leaky zone to a few hundred metres of main — before acoustic crews finish the job.
View serviceNon-Revenue Water (NRW) Program
Treated water that earns nothing — leaked, unmeasured, or unbilled — commonly runs 10–30% of production. The NRW program is the umbrella: water balance to size the problem, zone data to rank it, every detection method in this hub to locate it, and re-measurement to prove what came back.
View service← Municipal water main hub·Complete guide·Government programs
By BC region
Acoustic Water Main Leak Survey across BC
Dedicated local pages for every city we serve:
Scope it in one call
System size, pipe stock, loss picture — and a firm program quote, usually in one conversation.