Water drained from building such as dishwashers, clothes washers, sinks, and showers. Graywater usually requires some degree of treatment before it can be reused because it is likely to contain soap, contaminants from the kitchen, etc., but it does not include wastewater from toilets. Today, we usually mix graywater and blackwater (sewage from toilets). The potential uses for graywater are numerous, including landscape irrigation, carwash, toilet flushing, and pool use.

Wastewater drained from sinks, tubs,showers, dishwashers, clothes washers, and othernon-toilet sources

Household drain water from sinks, tubs, and washing (not from toilets).