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US Green Building Council LEED-Green-Associate Exam - Topic 6 Question 42 Discussion

Waste water from kitchen sinks is considered blackwater unless
B) local codes state otherwise
A) it is for use in toilets
C) it is only used for drip irrigation
D) a CIR is submitted and approved

US Green Building Council LEED-Green-Associate Exam - Topic 6 Question 42 Discussion

Actual exam question for US Green Building Council's LEED-Green-Associate exam
Question #: 42
Topic #: 6
[All LEED-Green-Associate Questions]

Waste water from kitchen sinks is considered blackwater unless

Show Suggested Answer Hide Answer
Suggested Answer: B

Blackwater is wastewater that contains fecal matter and pathogens, such as from toilets.Greywater is wastewater that is less contaminated, such as from showers, sinks, and washing machines1. However, the classification of kitchen sink wastewater may vary depending on local codes and regulations.Some states and authorities consider kitchen sink wastewater as blackwater because it may contain food waste and germs123.Others consider it as greywater if it meets certain quality standards and is used for beneficial purposes, such as irrigation or toilet flushing45. A CIR (Credit Interpretation Request) is a process to seek clarification on a specific credit or prerequisite in a LEED rating system, but it does not change the definition of blackwater or greywater.


Greywater Reuse | WaterSense | US EPA4

Greywater - California Department of Water Resources5

What Is Greywater? What Is Blackwater?| HomeServe USA1

Grey Water / Reclaimed Water | University of Maryland Extension2

What is meant by the terms Gray water and black water3

Credit Interpretation Requests (CIRs) | U.S. Green Building Council

by Xochitl at May 05, 2025, 07:45 AM

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Jacinta
5 months ago
Drip irrigation? That sounds weird for kitchen waste!
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Alexia
6 months ago
Wait, so it can be blackwater unless local codes say otherwise?
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Teri
6 months ago
I thought all kitchen sink water was graywater?
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Cristal
6 months ago
Blackwater typically includes waste from toilets.
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Roxane
6 months ago
Totally agree, local codes can change everything!
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Colton
6 months ago
I feel like I read that a CIR approval could change the classification, but I’m not entirely confident about that.
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Arthur
7 months ago
I practiced a similar question where the distinction between blackwater and graywater was based on usage, but I can't recall if drip irrigation was a factor.
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Desmond
7 months ago
I remember something about local codes affecting classifications of wastewater, so maybe option B is correct?
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Misty
7 months ago
I think blackwater is usually defined by its source, but I’m not sure if kitchen sink waste can be considered graywater under certain conditions.
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Cammy
7 months ago
Alright, let me read through the options and see if I can eliminate any of them.
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Lorenza
8 months ago
I've got a good feeling about this one. I'm pretty confident I know the right answer.
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Jacquelyne
8 months ago
Okay, let me see. I think the key is to focus on the conditions that would make kitchen sink wastewater not be considered blackwater.
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Jeanice
8 months ago
Hmm, I'm a bit unsure about this one. I'll need to think it through carefully.
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Nenita
8 months ago
This question seems straightforward, but I want to make sure I understand the key details before answering.
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Noelia
12 months ago
In that case, I think the answer would be D) a CIR is submitted and approved.
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Giuseppe
12 months ago
But what if the local codes don't specifically address it?
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Sherly
12 months ago
I disagree, I believe the answer is B) local codes state otherwise.
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Tammara
12 months ago
Wait, we're supposed to be dealing with 'blackwater' here? I thought this was a test on plumbing, not a horror movie!
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Giuseppe
12 months ago
I think the answer is A) it is for use in toilets.
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Deeann
1 year ago
A makes the most sense to me. If it's being used for toilets, it shouldn't be considered blackwater.
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Izetta
11 months ago
B) local codes state otherwise
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Hayley
11 months ago
I agree, using it for toilets seems like a good way to classify it differently.
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Shad
11 months ago
A) it is for use in toilets
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Truman
12 months ago
I think local codes might also play a role in determining if it's considered blackwater.
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Truman
12 months ago
I agree, using it for toilets would make it greywater.
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Viki
1 year ago
I think the answer is D) a CIR is submitted and approved, as that would ensure proper treatment of the waste water.
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Fletcher
1 year ago
D is obviously the right choice. You need to get that CIR approved before you can do anything with that wastewater!
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Xuan
12 months ago
Using kitchen sink wastewater for drip irrigation is not always allowed, so it's best to check with authorities first.
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Kanisha
12 months ago
It's important to follow local codes when it comes to handling blackwater.
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Julieta
1 year ago
I agree, you definitely need that CIR approval before using kitchen sink wastewater.
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Diane
1 year ago
But what if the local codes don't specifically address it?
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Darrin
1 year ago
I think B is the correct answer. Local codes can override the general definition of blackwater.
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Jeannetta
12 months ago
It's always important to be aware of and follow local regulations when it comes to waste water management.
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Bobbie
12 months ago
Yes, local codes can play a big role in determining how waste water is treated and classified.
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Stefania
12 months ago
I think B makes sense, it's important to follow local regulations when it comes to waste water.
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Tiera
1 year ago
I agree, local codes can definitely impact how waste water is classified.
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Lindsey
1 year ago
I disagree, I believe the answer is B) local codes state otherwise.
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Diane
1 year ago
I think the answer is A) it is for use in toilets.
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