LEED Water Efficiency
WE Credits 3.1 and 3.2: Water Use Reduction, 20% and 30% Reduction
The intent of this credit is
to choose water-conserving fixtures and/or incorporate rainwater or graywater systems to minimize the demand on potable water sources.
Requirements for Certification:
Reduce potable water consumption by 20% (WEc3.1) or 30% (WEc3.2).
Successful Strategies:
- Dual flush water closets
- Ultra low-flow water closets and urinals
- Waterless Urinals
- Sensor-operated, Low-flow lavatories
- Rainwater collection reuse systems
- Graywater reuse systems
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Helpful Hints:
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The water use reduction percentage in WEc3 addresses all flow and flush fixtures in the building (Exclude irrigation and building process loads such as dishwashers, lab sinks, washing machines, etc.).
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Simple strategies include, but are not limited to, aerators, flow restricters, low-flow showerheads, 0.5 gallon per flush urinals or low-flow water closets. More aggressive strategies may include pressure assisted water closets, waterless fixtures and dual flush water closets.
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Complete water use calculation comparison between design and baseline case to determine water reduction and to revise design specifications to achieve desired water reduction.
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Historical Data (updated June 2006):
- 73% of all California LEED Certified projects achieved WEc3.1 for LEED v2.1.
- 64% of all California LEED Certified projects achieved WEc3.2 for LEED v2.1.
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