7.4.9.4.Minimum Size of Building Drain and Sewer

(1) Building drains and building sewers connected to the public sewer system downstream of the main cleanout (see
     Sentence 7.4.7.1.(6)) shall be not less than NPS 4.

     (2) Storm building drains and storm building sewers shall be not less than NPS 4.

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.