Which pair correctly matches grey water and black water definitions?

Which pair correctly matches grey water and black water definitions?

• A. Grey water is drain waste; Black water is human waste
• B. Grey water is industrial waste; Black water is rainwater
• C. Grey water is potable water; Black water is seawater
• D. Grey water is groundwater; Black water is process water

Answer: (A)

Grey water and black water are distinguished by where the wastewater comes from. Grey water is the wastewater from non-toilet sources like sinks, showers, and laundry—stuff that doesn’t contain human waste. Black water is the wastewater that carries human waste, typically from toilets. So the pairing grey water as drain waste and black water as human waste reflects that non-toilet wastewater versus toilet-containing wastewater distinction. The other options mix in water types (industrial waste, rainwater, potable water, seawater, groundwater, process water) that aren’t definitions of grey versus black water.

Grey water and black water are distinguished by where the wastewater comes from. Grey water is the wastewater from non-toilet sources like sinks, showers, and laundry—stuff that doesn’t contain human waste. Black water is the wastewater that carries human waste, typically from toilets. So the pairing grey water as drain waste and black water as human waste reflects that non-toilet wastewater versus toilet-containing wastewater distinction. The other options mix in water types (industrial waste, rainwater, potable water, seawater, groundwater, process water) that aren’t definitions of grey versus black water.