The Ontario Building Code | Sewage Systems
11.4.3.6. Sewage Systems
(1) Where the performance level of an existing buildingis reduced under Article 11.4.2.5., upgrading of a sewage system which is adversely affected by the construction, increase in occupant load, increase in the total daily design sanitary sewage flow or change in amount or type of sanitary sewage shall be required in conformance with Part 8.
In Plain Language
Where a renovation reduces a building's performance level, a sewage system adversely affected by the construction, occupant load increase, or change in sewage flow or type must be upgraded to conform with Part 8, as set out in this article.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.