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US Green Building Council LEED-Green-Associate Exam - Topic 4 Question 48 Discussion

Actual exam question for US Green Building Council's LEED-Green-Associate exam
Question #: 48
Topic #: 4
[All LEED-Green-Associate Questions]

When considering water conservation and water efficient landscaping, which type of water would be most useful for landscape irrigation?

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Suggested Answer: A

Rainwater is the type of water that would be most useful for landscape irrigation when considering water conservation and water efficient landscaping.Rainwater is water that falls from the sky as precipitation, and it can be collected and stored in tanks, barrels, cisterns, or ponds for later use1.Rainwater is a renewable and free source of water that does not require any treatment or pumping, unlike potable water, which is water that is safe for human consumption and often comes from municipal sources2.Potable water is a scarce and valuable resource that should be conserved for drinking, cooking, and hygiene purposes, rather than for irrigation2.Clean water is a vague term that can refer to any water that is free of contaminants, but it does not necessarily mean that it is potable or suitable for irrigation3.Blackwater is water that contains human or animal waste, such as sewage or toilet water, and it poses a health and environmental risk if used for irrigation without proper treatment4.Therefore, rainwater is the best option for landscape irrigation, as it reduces the demand for potable water, lowers the utility bills, and benefits the plants and soil1.


Rainwater Harvesting for Landscape Irrigation

Potable Water

Clean Water

Blackwater

by Dannie at Nov 21, 2025, 05:31 AM

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Graham
5 hours ago
Rainwater harvesting is smart! Saves money and resources.
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Tom
5 days ago
Potable water should be for drinking, not irrigation.
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Anastacia
11 days ago
Clean water is good, but why waste it?
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Demetra
16 days ago
Blackwater seems risky for plants. I’d avoid it.
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Ricarda
21 days ago
Definitely rainwater! It reduces runoff too.
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Jeannetta
26 days ago
I think rainwater is the best choice. It's free and natural!
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Shaun
1 month ago
Wait, are we really considering blackwater? That's surprising!
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Willetta
1 month ago
Rainwater is the best choice, no doubt!
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Jeanice
2 months ago
Blackwater for irrigation? That sounds risky...
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Lamonica
2 months ago
I think clean water is the safest option.
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Reuben
2 months ago
Definitely rainwater, it's free and eco-friendly!
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Noah
2 months ago
Potable water for irrigation? What is this, a five-star hotel? A) Rainwater all the way, my friends.
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Noel
3 months ago
A) Rainwater, hands down. Gotta love that natural, chemical-free goodness for my garden.
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Janella
3 months ago
B) Blackwater? Really? I'd rather not use my toilet water to grow my tomatoes, thanks.
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Laticia
3 months ago
I'd go with A) Rainwater. It's like nature's own irrigation system - can't beat that!
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Margot
3 months ago
Definitely A) Rainwater. It's the most eco-friendly and cost-effective option for watering your plants.
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Leota
3 months ago
A) Rainwater is the most useful for landscape irrigation, as it's free, renewable, and doesn't require any treatment.
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Casie
3 months ago
I'm torn between rainwater and potable water. I know potable is safe, but isn't it better to save that for drinking?
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Rhea
4 months ago
I remember discussing blackwater in class, but I don't think it's suitable for landscaping. Clean water seems too wasteful for irrigation.
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Melinda
4 months ago
I'm a little confused on this one. I know rainwater is good, but what about greywater or reclaimed water? I'll have to review my notes before deciding.
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Rutha
4 months ago
Potable water seems like the obvious choice, but that would be a waste. I'll go with rainwater - it's the most sustainable option.
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Shelton
4 months ago
I think rainwater would be the best option for irrigation since it's free and sustainable, but I'm not entirely sure if it's the only choice.
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Justine
5 months ago
I feel like we did a practice question on this, and rainwater was definitely highlighted as a top choice. I hope I remember that correctly!
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Nada
5 months ago
Rainwater is the way to go. Conserving clean water for drinking is important, so using rainwater for irrigation is the smart choice.
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Lemuel
5 months ago
Hmm, I'm not sure. Blackwater could work, but I'm not sure if that's allowed or safe. I'll have to think this one through.
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Vernice
5 months ago
I think rainwater would be the most useful for landscape irrigation. It's free and environmentally friendly.
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Beula
4 months ago
I totally agree, rainwater is the best choice!
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