Final answer:
WEp Building-Level Water Metering requires metering the supply water in a building.
Step-by-step explanation:
In WEp Building-Level Water Metering, only the supply water is required to be metered.
Building-level water metering is a method used to monitor and measure the water consumption of a building, such as a home or office. It helps track and control water usage, identify leaks, and promote water conservation.
In this context, the term 'water metering' refers to the installation of water meters to measure the amount of water used. These meters can be placed on the supply line that brings water into the building. By tracking the flow of water, the meters provide data for monitoring and billing purposes.