OBC DIVISION B · PART 8 — SEWAGE SYSTEMSUpdated for the 2024 Ontario Building Code
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Section 8.5 — Class 3 Sewage Systems
Full text of Section 8.5 (Class 3 Sewage Systems) — Division B, Part 8 (Sewage Systems) of the 2024 Ontario Building Code, with every article reproduced below.
8.5.1.General Requirements
8.5.1.1.Scope permalink →
(1) This Section applies to the construction of a Class 3 sewage system.
8.5.1.2.Application permalink →
(1) A Class 3 sewage system shall not be constructed where the daily design sanitary sewage flow to the system exceeds
1 000 L/day.
(2) A Class 3 sewage system shall be designed to receive only the contents of a Class 1 sewage system or effluent from a
Class 1 sewage system for disposal.
8.5.2.Design and Construction Requirements
8.5.2.1.Construction Requirements permalink →
(1) The bottom of the cesspool shall be at least 900 mm above the high ground water table.
(2) The cesspool 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 cesspool shall be an open jointed material of a type that
will permit leaching from the cesspool.
(4) The cesspool shall be provided with a tight strong cover that shall remain over the cesspool except when it is
necessary to remove it for the purposes of adding sanitary sewage to or removing sanitary sewage from the cesspool or
for purposes of maintenance of the cesspool.
(5) Where the cesspool extends to the ground surface, the cover required in Sentence (4) shall be lockable.
(6) The soil or leaching bed fill around the perimeter of the cesspool shall be raised or mounded to a height of at least
150 mm above ground level.
(7) The surface of the ground in the area of the cesspool shall be graded such that surface drainage in the area will be
diverted away from the cesspool.
(8) The cesspool shall be surrounded on all sides and on its bottom by at least 600 mm of soil or leaching bed fill,
except the top where the cesspool extends to the surface of the ground.
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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.