Learn about graywater sources for the USGBC LEED Green Associate certification exam. Discover why lavatory faucets are considered graywater, while toilets and urinals are not.
Table of Contents
Question
Which of the following is a source of graywater?
A. Toilets
B. Urinals
C. Sprinklers
D. Lavatory faucets
Answer
D. Lavatory faucets
Explanation
Graywater refers to relatively clean wastewater from domestic activities such as washing dishes, laundry, and bathing. Water from lavatory faucets falls into this category. Graywater can be treated and reused for non-potable purposes such as toilet flushing or irrigation, which can help conserve water.
Graywater, also known as greywater, is wastewater generated from household activities such as laundry, dishwashing, and bathing. It does not include wastewater from toilets or urinals, which is considered blackwater due to its higher concentration of contaminants and pathogens.
Lavatory faucets, used for handwashing and other bathroom activities, produce graywater. This water can be collected, treated, and reused for non-potable purposes such as landscape irrigation or toilet flushing, helping to reduce freshwater consumption and wastewater generation in buildings.
Toilets and urinals (options A and B) are not sources of graywater because they produce blackwater, which requires more intensive treatment before it can be safely reused or discharged into the environment.
Sprinklers (option C) are not a source of graywater, as they are typically used for irrigation purposes and do not generate wastewater.
In summary, lavatory faucets are the only option listed that produces graywater, making it the correct answer to this LEED Green Associate Exam question. Understanding the difference between graywater and blackwater sources is crucial for designing and implementing sustainable water management strategies in green buildings.
USGBC LEED Green Associate certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the USGBC LEED Green Associate exam and earn USGBC LEED Green Associate certification.