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LEED Water Efficiency: What's the Difference Between WEc3 and the WE Prerequisite?

 
Question:

Alysson asks: Concerning the LEED-NC credits, could you explain the difference between the Water Efficiency prerequisite (20% reduction) and the Water Efficiency Credit (credit WE 3) of 20%? Is there a difference in the type of water or usage it specifies? Thank you!

Answer:
Advice provided by: John Schafer, LEED AP, ISSA, Staples Facility Solutions
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Hi Alysson,

The LEED-NC 2009 version has a Water Efficiency Prerequisite that does require a 20% reduction in water use (earlier versions did not have this as a prerequisite and awarded a point for a 20% reduction). The Water Efficiency Credit (WE 3) awards two points for a 30% reduction, 3 points for a 35% reduction and 4 points for a 40% reduction. (A 45% reduction earns you an exemplary performance point under IDc1)

Various strategies can be employed to achieve the prerequisite and credit: using efficient fixtures; exploring the use of waterless urinals; utilizing non-potable water sources for toilet flushing.

LEED has made changes to the various designations and it is prudent to check the latest version for any updates.

I hope this has answered your question. You can always visit the US Green Building website for further clarification.

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Expert Advice and Comments

RE: Water efficiency

Mon, 11/22/2010 - 11:44 — GBGuru

Hi Alysson,

Another answer to your question has been posted here: http://www.green-buildings.com/content/781678-leed-water-efficiency-credits

Cheers,

Rob

nrosen's picture

LEED Water Efficiency: What's the Difference Between WEc3 and th

Thu, 01/06/2011 - 09:59 — nrosen

Alysson,

Be careful...The intent of the pre-req is that you achieve the 20% reduction using efficient fixtures. You can then use alternative non-potable water sources to help achieve the credit. Alternative water sources cannot be used as a means of achieving the pre requisite.

Hope that helps.

Neil

Neil Rosen, AIA, LEED AP BD+C, CHFM, EDAC

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