7.2.11.4.Required Check Valve

(1) Where a water service pipe is supplied with water by more than one drinking water system, a check valve shall be
  installed at each connection with a drinking water system.

  (2) Where a fire service main is supplied with water by more than one source, a check valve shall be installed at each
  connection with a source of water.

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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.