A sanitary sewer (also called, especially in the UK, a foul sewer) is a type of underground carriage system for transporting
sewage from houses or industry to
treatment or disposal. In some areas, sanitary sewers are separate
sewer systems specifically for the carrying of domestic and industrial wastewater, and are operated separately and independently of
storm drains, which carry the runoff of rain and other water which wash into city streets. Sanitary lines generally consist of laterals (services to a particular unit), mains, and manholes (or other various forms of traps). The most commonly used sanitary pipe is SDR-35, with smaller sized laterals interconnected within a larger sized main.
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Underground pipes that carry off only domestic or industrial waste, not storm water.
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