What it contributes
Specialist listening equipment can help pick up sound associated with escaping pressurised water. Accessible pipe points and ground surfaces may offer different ways to assess the suspected route.
What it cannot establish alone
Traffic, pipe material, depth and pressure affect what can be heard. Silence does not establish that a pipe is sound.
The method is selected for the conditions at the property. More than one kind of observation may be needed, and the report should make clear which findings support the proposed next step.
Before the visit
Keep existing pipe drawings and earlier findings available. Describe any restrictions on isolation, access or normal system operation. You do not need to choose or prepare a specialist test yourself.
A related service
Look along the incoming supply.
Mains water leak detection