Minimum water efficiency | U.S. Green Building Council
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LEED O+M: Existing Buildings | v2 - LEED 2.0

Minimum water efficiency

WEp1 | Required


Maximize fixture water efficiency within buildings to reduce the burden on potable water supply and wastewater systems.


Reduce fixture potable water usage to a level equal to or below water use baseline, calculated as 120% of the water usage that would result if 100% of the total building fixture count were outfitted with plumbing fixtures that meet the Energy Policy Act of 1992 fixture performance requirements. If the building does not have separate metering for each water use (fixture use, process use, irrigation and other uses), the water use reduction achievements can be demonstrated with calculations. At least one meter for the overall building water use is required and metering for cooling towers and other process water uses are encouraged but not required.

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