- Building Sewer
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That part of the drainage system that extends from the end of the building drain and conveys the discharge to a public sewer, private sewer, individual sewage disposal system or other point of disposal.
- Combined Sewer
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A building sewer that conveys both sewage and storm water or other drainage.
- Sanitary Sewer
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A building sewer that conveys sewage only.
- Storm Sewer
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A building sewer that conveys storm water or other drainage, but not sewage.
(International Plumbing Code® 202.0)