Greywater, sometimes spelled graywater, grey water or gray water and also known as sullage, is non-industrial wastewater generated from domestic processes such as washing dishes, laundry and bathing. Greywater comprises 50-80% of residential
wastewater. Greywater is distinct from
blackwater in the amount and composition of its chemical and biological contaminants (from
feces or
toxic chemicals). Greywater gets its name from its cloudy appearance and from its status as being neither fresh (white water from
groundwater or
potable water), nor heavily polluted (blackwater). According to this definition wastewater containing significant food residues or high concentrations of toxic chemicals from household cleaners etc. may be considered "dark grey" or blackwater.
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Domestic wastewater composed of wash water from kitchen, bathroom, and laundry sinks, tubs, and washers.
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