The Ontario Building Code | Existing Septic Tanks
11.3.5.1. Existing Septic Tanks
(1) Despite Subsections 11.3.1. to 11.3.3., where an existing septic tank is subject to material alteration, repair or replacement, the construction of the septic tankshall comply with Part 8.
In Plain Language
Existing septic tanks affected by a renovation project must meet the requirements 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.