Household water use quiz. Question is. Wastewater from which sources is technically considered graywater, but should be treated as blackwater?
A. Water from bathing and showering
B. Water from dishwashing
C. Water from washing machines
D. Water from toilets
The correct answer is D. Water from toilets. Wastewater from toilets is technically considered graywater, but due to its high concentration of pathogens, it should be treated as blackwater and not reused for other purposes.