Similar term(s): waste-water.
Sewage refers to waste-water from homes and industry which is collected and carried away in sewers (pipes or tunnels). When raw waste-water is cleaned in treatment plants the waste product is sewage sludge, which can be used as a fertiliser under certain conditions or deposited in landfills.
Source: GreenFacts
Español: Aguas residuales
Français: Eaux usées