Practice Quiz

Green Plumbing

Category - Water-Efficient Technology

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Which describes the distinction between graywater and blackwater?
  1. Reusing untreated graywater creates no risks; reusing untreated blackwater is potentially dangerous
  2. Graywater comes from the after-effects of storms; blackwater comes from irrigated compost filtering
  3. Graywater comes from bathing, laundry, dishes; blackwater comes from toilet waste
  4. A and C above
Explanation
Answer: C - Graywater is produced from water used for bathing, laundry, dishwashing, and other activities in which it does not come into contact with fecal matter or urine. Blackwater is water used for flushing toilets. Untreated graywater can create risks due to potential pathogens in the trace substances it contains, to chemicals in soaps and detergents that could damage plants irrigated with it, and to turbidity that could harm equipment in reuse applications that require clear water.
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