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US Green Building Council LEED-AP-ID+C Exam - Topic 6 Question 29 Discussion

A tenant implements the following strategies to reduce the amount of water used. Which strategy is applicable to the Water Efficiency Credit, Indoor Water Use Reduction for LEED Interior Design and Construction: Commercial Interiors?
A) Composting toilet
B) Low-flow irrigation system
C) Commercial clothes washer
D) Roof runoff for chiller make-up water

US Green Building Council LEED-AP-ID+C Exam - Topic 6 Question 29 Discussion

Actual exam question for US Green Building Council's LEED-AP-ID+C exam
Question #: 29
Topic #: 6
[All LEED-AP-ID+C Questions]

A tenant implements the following strategies to reduce the amount of water used. Which strategy is applicable to the Water Efficiency Credit, Indoor Water Use Reduction for LEED Interior Design and Construction: Commercial Interiors?

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Suggested Answer: A

The composting toilet is applicable to the Water Efficiency Credit, Indoor Water Use Reduction for LEED Interior Design and Construction: Commercial Interiors because it significantly reduces the amount of water used for conventional flushing toilets. By composting human waste, this system eliminates the need for water in the disposal process, contributing to indoor water use reduction.


by Hildred at Jun 26, 2026, 02:56 PM

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Renea
4 days ago
A composting toilet can save a ton of water!
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Vincenza
9 days ago
I feel like roof runoff is more about outdoor water management, so I don't think that one would count for this credit.
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Beata
14 days ago
The commercial clothes washer seems like it could fit the criteria for indoor water use reduction, but I need to double-check the specifics.
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Micah
19 days ago
I remember practicing a question about low-flow fixtures, but I can't recall if that applies here.
upvoted 0 times
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Rebbecca
25 days ago
I think the composting toilet might be a good option, but I'm not entirely sure if it qualifies for the LEED credit.
upvoted 0 times
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