To earn this credit your project must submeter at least two water subsystems. This credit is typically low-cost and easy to implement, while offering significant long-term benefits, including providing building operators with the tools to track, manage, and optimize water use at the subsystem level.
For the irrigation, indoor plumbing, domestic hot water, and process water subsystems, only 80% of the total end use has to be metered. This provides some flexibility for projects that have design considerations that might prevent metering of 100% of a given subsystem. For boiler metering to contribute to credit compliance, the boiler must use at least 100,000 gallons of water a year, or at least 500,000 BtuH/year. Metering reclaimed water sources can contribute regardless of rate (quantity of water), but 100% of the system must be metered.
Several types of meters can meet the credit requirements, from high-end, BAS (building automation system) integrated meters to simple, manual read and clamp-on meters. Note that these submeters need to track consumption within the whole building consumption tracked by the main meter(s) installed per the prerequisite.
What’s New in LEED v4
- This is a new credit!