Municipal Water Mains · Large diameter
Trunk & Transmission Main Leak Detection for BC utilities.
The big pipes play by different rules: low-frequency leak noise, long runs between contact points, and failure consequences nobody wants to meet. Specialist acoustic methods for transmission and trunk mains — found early, while the fix is still a scheduled repair instead of a crater.
Free phone consult · No pressure · Mon–Sat 8am–6pm PT
Why utilities choose it
- Catches the leak before it becomes the headline
- Methods matched to low-frequency, long-span physics
- Pairs with aerial thermal screening along the alignment
- Findings feed renewal planning, not just repairs
Built for
How it runs
- 1
Main characterisation
Diameter, material, lining, depth, appurtenance inventory, and surge history define the acoustic problem. Transmission work is planned main by main — there is no generic approach at this scale.
- 2
Alignment screening
Where the corridor suits it, our drone thermal survey screens the full alignment first — surface moisture anomalies rank the spans worth intensive acoustic time. Kilometres collapse to candidates.
- 3
Low-frequency acoustic work
Specialist sensors at the contact points that exist — chambers, air valves, offtakes — listen and correlate in the low-frequency band where big-pipe leak energy actually lives. Sparse access is the craft here.
- 4
Confirmation & report
Suspect spans get verified with every tool that applies — ground microphones over the alignment, targeted exposure where warranted — and findings land in a report sized for the asset's consequence level.
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
Why are transmission mains harder to survey than distribution pipe?
Three compounding reasons. Leak noise on large-diameter mains concentrates at low frequencies that standard correlator sensors hear poorly. Contact points are sparse — chambers and air valves every several hundred metres instead of hydrants every block — stretching correlation spans. And the pipes are usually deeper, with more soil swallowing the signal. The methods exist for all three; they're just specialist work rather than a routine survey pass.
What does early detection on a trunk main actually avert?
The difference between a planned night repair and a failure event: an arterial road undermined, properties flooded, a boil-water advisory, supply interruption to whole neighbourhoods, and the political aftermath. Large mains rarely fail without leaking first — sometimes for months. Finding that precursor leak is among the highest-stakes, highest-return work in the entire water loss field.
How does the aerial layer help on transmission corridors?
It solves the where-to-spend-time problem. A transmission main may run ten kilometres with twenty usable contact points; intensive acoustic work everywhere is slow. Our drone thermal screening flies the alignment and flags surface moisture anomalies, our crews then concentrate the low-frequency acoustic effort on the flagged spans. Screening from the air, confirmation on the ground — one company, both layers.
Can you survey a transmission main without shutting it down?
Yes — everything described here works on live, pressurised mains; pressure is in fact what makes leaks audible. Shutdowns enter the conversation only for internal inspection methods, which sit beyond leak detection scope. Our findings frequently inform whether that bigger intervention is justified — and exactly where.
Related municipal services
Acoustic Water Main Leak Survey
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.
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 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 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 service← Municipal water main hub·Complete guide·Government programs
By BC region
Trunk & Transmission Main Leak Detection 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.