PART 7 — PLUMBINGUpdated for the 2024 Ontario Building Code
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7.6.2.2.Back-Siphonage
(1) Every potable water system that supplies a fixture or tank that is not subject to pressures above atmospheric shall be
protected against back-siphonage by a backflow preventer.
(2) Where a potable water supply is connected to a boiler, tank, cooling jacket, lawn sprinkler system or other device
where a non-potable fluid may be under pressure that is above atmospheric or the water outlet may be submerged in the
non-potable fluid, the water supply shall be protected against backflow by a backflow preventer.
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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.