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FAQs about WEp1 :

Can I include process water savings in order to earn an Exemplary Performance point?

Will the reviewers accept a spreadsheet as a plumbing fixture schedule in lieu of the plans from the Construction Documents?

In LEED review comments I've been referred to the Water Use Reduction Additional Guidance document. I didn't know this was a required reference document.

Should I include bar sinks? What about mop sinks or janitor sinks? Swimming pools? Safety showers? Bidets? Tub spouts?

We provided new showers in our project to comply with the alternative transportation credit. Should they be considered in WEp1 calculations?

Can you explain the 12-second duration for metering faucets?

Can I use a nonpotable water source to contribute to WEp1 compliance?

Our project does not have any eligible water fixtures in the project boundary. Can we comply with WEp1?

We are having trouble finding EPAct-compliant fixtures. Is that a problem?

Where can I find a clear meaning of "public" and "private" as relevant to lavatory faucets?

Our project is a factory with historically a 95% male workforce. The restroom design accounts for this. Can I argue that the male/female gender ratio is different than 50/50?

Are shower duration controls an acceptable water-saving strategy?

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Forum discussion

NC-2009 WEp1:Water Use Reduction—20% Reduction

rainwater harvesting ACP for non-healthcare/retail projects

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Michael Maier
Leroy Street Studio
LEEDuser Basic Member
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The Water Use Reduction - Additional Guidance document seems to indicate that although on-site non-potable water sources for flush fixtures and/or flow fixtures (i.e. rainwater harvesting) can be counted in water reduction calculations, this use is limited to "Retail and Healthcare" projects, presumably under their relevant rating systems. Can anyone confirm that an alternative compliance path including rainwater harvesting in water use calculations has been successfully used for WEp1 and WEc3 for typical projects under LEED NC 2009? Many thanks in advance!

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Thu, 10/24/2013 - 22:41

Hi Nik, Why do you have that impression? We are pursuing this on a Core & Shell project currently, though it has not gone through review. I see nothing in the Guidance to suggest that limitation. I can say that we've been doing this for many years, long before Retail and Healthcare existed as rating systems, and this option has always been available.
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Michael Maier
Leroy Street Studio
LEEDuser Basic Member
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Thu, 10/24/2013 - 22:53

Hi Michelle, I may be reading this entirely wrong, but under Non-potable Water Use Calculations the first paragraph ends "Retail and Healthcare projects may apply on-site non-potable water sources for fixtures and process water use reduction" -- not sure if this is a restriction or simply an additional clarification to usage on NC 2009 projects. Anyway, if you've had success in the past using rainwater in the water usage reduction calcs, that about answers my question! Thanks -- apologies for the name confusion, there was some sign-up confusion within the office.

Thu, 10/24/2013 - 22:57

Hi Brian, Ah, I believe they are just trying to say you can do it for those types of projects which involved process water also. Good luck.

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