PART 8 — SEWAGE SYSTEMSUpdated for the 2024 Ontario Building Code
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8.2.2.4.Holding Tanks
(1) All holding tanks shall be of such design and construction as will allow the complete removal of solid matter that
can be expected to settle in the holding tank through an apparatus or device suitable for allowing the contents of the
holding tank to be removed from the holding tank.
(2) A holding tank shall have a working capacity of not less than 9 000 L.
(3) Where two or more tanks are used to meet the requirement of Sentence (2), they shall be deemed to be one holding
tank provided they are connected in such a manner as will allow the sanitary sewage contained in them to flow between
the tanks.
(4) The working capacity of the tanks described in Sentence (3) shall not include any portion of any tank that cannot be
completely drained due to the manner in which the connections are made.
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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.