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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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Trinidad
3 days ago
Totally agree, low-flow fixtures are a must for LEED!
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Ellsworth
8 days ago
Not sure if a composting toilet counts for this credit.
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Tayna
13 days ago
I thought roof runoff was more for outdoor use?
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Pok
18 days ago
Definitely C, commercial clothes washers are key for indoor use.
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Justa
23 days ago
A composting toilet can save a ton of water!
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Veronique
28 days ago
Totally agree, low-flow fixtures are a must for LEED!
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Gary
1 month ago
Not sure if a composting toilet counts for this credit.
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Annice
1 month ago
I thought roof runoff was more for outdoor use?
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Santos
1 month ago
Definitely C, commercial clothes washers are key for indoor use.
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Renea
2 months ago
A composting toilet can save a ton of water!
upvoted 0 times
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Vincenza
2 months 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
2 months 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
2 months ago
I remember practicing a question about low-flow fixtures, but I can't recall if that applies here.
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Rebbecca
2 months 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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