Domestic wastewater is the spent water originating from all aspects of human and sanitary usage that principally originates from residences and is commonly known as sanitary sewage. Also included are non-toxic wastes from commercial buildings, industrial plants and institutions. As such, the characterization of all domestic wastewater involves an examination of its composition and flow characteristics.
The composition of domestic wastewater refers to the actual quantities of physical, chemical and biological constituents. The water supplied to a community will typically contain mineral and organic matter, to which feces, urine, paper and waste from water softeners and other substances are added.