sewage. Sewage is waste matter such as faeces or dirty water from homes and factories, which flows away through sewers. Sewage (or domestic wastewater or municipal wastewater) is a type of wastewater that is produced by a community of people. It is characterized by volume or rate of flow, physical condition, chemical and toxic constituents, and its bacteriologic status (which organisms it contains and in what quantities). It consists mostly of greywater (from sinks, tubs, showers, dishwashers, and clothes washers), blackwater the water used to flush toilets, combined with thehuman waste that it flushes away); soaps and detergents; and toilet paper (less so in regions where bidets are widely used instead of paper).