Loggers vs survey crews. The municipal listening question, answered.

No — and vendors who imply otherwise are selling hardware, not outcomes. A logger POI says 'persistent leak-like noise near this chamber'; it does not locate the leak, discriminate a passing valve from a main leak, or produce a position your excavator can use. Every logger program ends with correlation crews for exactly that reason. Loggers are a magnificent aiming system for the expensive resource — crew hours — and a poor substitute for it.

It depends entirely on network size and loss density. Compact, loss-heavy systems: crews alone are cheapest — they find leaks from day one with zero hardware. Large networks with scattered losses: loggers-then-crews wins, because crew hours stop being spent walking quiet pipe. The honest accounting is cost per CONFIRMED leak including follow-up — a cheap POI that dead-ends at a passing valve wasn't cheap. Our appurtenance-survey-first sequencing exists to keep that number honest.

Above it, for the right geometry. On long corridors — transmission mains, rural lines, big-parcel routes — a drone thermal flight ranks kilometres per evening, which neither loggers (chamber-spacing limited) nor crews (pace limited) can match. It feeds the same funnel: aerial ranks the corridor, loggers or crews rank the zones, correlation marks the dig. We run all three layers, which is precisely the point of asking one company.

Sensitivity drops the same way it does for every acoustic method — plastic attenuates leak noise fast, so effective logger spacing on PVC shrinks, and quiet weeps can sit between loggers unheard. Campaigns on PVC-heavy systems compensate with tighter deployment and lean harder on the hydraulic methods (night flows, step testing) that don't care about material. It's a design parameter, not a dealbreaker — but it's why cookie-cutter logger spacing imported from cast-iron cities underperforms in BC suburbs.

Substantially — in your favour. Night-flow data ranks zones for free, which is half of what a logger campaign buys. Metered systems often sequence: night flows pick the worst zones, loggers or step tests narrow inside them, crews pinpoint. Unmetered systems lean more on loggers and aerial screening for the ranking layer. Either way the pinpointing endgame is identical.

The sequence, sized to your system: appurtenance cleanup first (false signals out, cheap wins in), then ranking — night flows if you're metered, lift-and-shift loggers if you're not, aerial thermal on long corridors — then crew correlation on everything ranked, then permanent loggers only where a zone's history justifies hardware. We sell the program shape because it's what works, and every layer of it is ours to deliver and stand behind. 604-239-9934 scopes it in one call.