1. Check if you have ...

1. Check if you have reliable water meters installed and pipe layout drawing. You can compare the consumption (volume) between Inlet and Outlet Water Meters.

Inlet Water Meters: e.g. water meters from roof tank or ground tank that supply your water

Outlet Water Meters: e.g water meters on each floor or each buildings

Then compare the consumption (volume) based on a time cut off at the same time. Based on my experience, difference < 10% is considered to be normal.

2. Do “Step Test”. At night close all output and see whether the Inlet Water Meter is still counting or not. If still counting, means that flow exists and you potentially have physical leakage and you need to locate it. That is why you need pipe layout and reliable water meters installed.