PART 8 — SEWAGE SYSTEMSUpdated for the 2024 Ontario Building Code
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8.4.2.1.Construction Requirements
(1) The bottom of the pit shall be at least 900 mm above the high ground water table.
(2) The pit shall be constructed in such a manner as to prevent the collapse of its sidewalls.
(3) Any material used to support or form the sidewalls of the pit shall be an open jointed material of a type that will
permit leaching from the pit.
(4) The pit shall be provided with a tight, strong cover that shall remain over the pit except when it is necessary to
remove it for purposes of adding greywater to or removing greywater from the pit or for purposes of maintenance of the
pit.
(5) The earth around the perimeter of the pit shall be raised or mounded to a height of at least 150 mm above ground
level.
(6) The surface of the ground in the area of the pit shall be so graded that surface drainage in the area will be diverted
away from the pit.
(7) The pit shall be surrounded on all sides and on its bottom by at least 600 mm of soil having a percolation time of
less than 50 min.
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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.