The Ontario Building Code | Water Tests
7.3.7.3. water Tests
(1) Where a water test is made, all air shall be expelled from the system before fixture control valves or faucets are closed.
(2) Potable water shall be used to test a potable water system.
Section 7.4. drainage Systems
7.4.1. application
In Plain Language
When a water test is performed on a potable water system, all air must first be expelled from the system before fixture valves or faucets are closed, so pressure readings during the test are accurate.
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.