Closing a valve can help narrow an investigation, but the result is only as reliable as the test record. In a Reading property with several branches, appliances or shared supplies, ‘the water was turned off’ is rarely detailed enough for someone else to reproduce or review the test.
Identify the control and its normal state
Name the exact valve, meter or control and where it is located. Photograph its starting position if that can be done safely. Record whether it was fully open, partly open, closed or already difficult to operate, and who authorised the change.
Do not operate unfamiliar, seized or shared controls simply to create evidence. A valve can fail to shut completely or affect other occupants. When the supply arrangement is uncertain, a competent plumber or leak investigator should identify the boundary first.
Define the observation window
Write down the start and finish time, which outlets and appliances were excluded, whether a storage cistern could refill, and what was observed. A meter that appears still for a few minutes is not the same test as a longer controlled observation, and neither alone identifies the route or location of a defect.
If the property has a shared supply, the result may include use elsewhere. Ofwat explains that responsibility for supply pipes depends on where the pipe sits and whether it serves more than one property. Establishing ownership and the test boundary are separate tasks.
Restore and verify
Record the final valve position, confirm that expected services have returned, and note any air, noise or abnormal operation. Keep the initial and final readings together. If a control was not returned to its original state, explain why and identify who took responsibility for the next action.
A good log supports, rather than replaces, professional diagnosis. Its purpose is to show exactly what changed and what followed, so a report can state a defensible conclusion and its limitations.
Where more than one person controls the test, name the person at the valve and the person watching the meter or affected area. Agree the timing method in advance. This small detail reduces uncertainty about whether observations were made during the same isolation period.
Further reading
Prepared with AI assistance using the sources listed above. General information cannot diagnose an individual property. Contact us to discuss your circumstances.
Would you like to talk it through?
Tell us what you have noticed and request a callback for further information.
Speak to a specialist