Which is the most appropriate source of graywater for this use?

A developer has asked the building designer to incorporate a landscape irrigation system using the building’s graywater in order to earn LEED points.

Which is the most appropriate source of graywater for this use?
A . Urinal
B . Toilet
C . Janitor sink
D . Bathroom sink

Answer: D

Explanation:

Graywater refers to wastewater that is not heavily soiled, typically from bathroom sinks, showers, tubs, and washing machines. It does not include water from toilets (which is considered blackwater) or kitchen sinks (which can contain food waste). Graywater can be treated and reused for purposes like landscape irrigation, which can save water and earn LEED points.

Reference: LEED Green Associate Candidate Handbook, U.S. Green Building Council resources