The Ontario Building Code | Application of Tests
7.3.7.1. application of Tests
(1) After a section of a potable water system has been completed, and before it is placed in operation, a water test or an air test shall be conducted.
(2) A test may be applied to each section of the system or to the system as a whole.
(3) Where a prefabricated system is assembled off the building site in such a manner that it cannot be inspected and tested on site, off-site inspections and tests shall be conducted.
(4) Where a prefabricated system is installed as part of a water system,
(a) all other plumbingwork shall be tested and inspected, and
(b) the complete system shall be pressure tested.
In Plain Language
Before a completed section of potable water system is placed into service, it must undergo a water test or air test as described in this Subsection, confirming it's safe and leak-free before use.
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.