Step Testing & Zone Isolation in Vancouver, BC

By process of elimination, measured at the zone meter. The zone's inflow is watched while valves close in sequence, each closure isolating another segment. When a closure drops inflow by more than that segment's plausible night demand, the difference is leakage inside the segment you just isolated. It is beautifully indifferent to pipe material, depth, soil, or how quiet the leak is — if water flows to it, the meter sees it stop.

Because some leaks defeat listening: deep mains, soft trench backfill swallowing noise, PVC attenuating it, or background loss spread across many small weeps no single one of which correlates. Step testing doesn't care — it counts litres. The professional pattern is hydraulic narrowing first where acoustics struggle, acoustic pinpointing inside the guilty segment after. Each method covers the other's blind spot.

Designed and run properly, almost never. Isolations are brief, sequenced at minimum-demand hours, and planned around critical users (anyone on home dialysis, care facilities, process customers get specific handling). The test plan includes restoration verification — every valve confirmed reopened, the zone confirmed back to normal supply before the crew leaves. That discipline is non-negotiable.

Vancouver ground is predominantly glacial till uplands with deltaic sands toward False Creek and Fraser flats. Till and sand image well — 400 MHz reaches 2–3 m across most of the city; signal shortens in fill zones around False Creek and the port lands. For leak work that cuts two ways: it shapes whether escaping water surfaces or vanishes, and it influences how leak noise carries to our sensors — both factored into how we run step testing & zone isolation here, and into when we recommend pairing the aerial thermal screen with the ground crews.

Pre-1965 oil-tank-era homes on the west side, post-tensioned towers downtown, and some of BC's oldest buried services in Strathcona and Mount Pleasant. The water mains underneath broadly track that growth story — each construction era left its pipe materials behind, from early metallic stock through the postwar asbestos-cement years to modern PVC — and each material gets matched methods in our survey design.

Where the data quality requires it, yes — minimum-demand hours give the cleanest acoustic and flow readings, and noise loggers do their listening at 2–4 a.m. by design. Scheduling is coordinated with your operations staff, Mon–Sat, and active breaks get priority response. 604-239-9934.

Province-wide pricing — no regional premium for Vancouver or anywhere in the Metro Vancouver. Surveys and programs are quoted by network size and scope; single investigations start in the high hundreds. The free phone consult produces a firm number in about five minutes.