The Ontario Building Code | Markings Required
7.7.2.1. Markings Required
(1) Non-potable water piping shall be identified by markings that are permanent, distinct and easily recognized.
(2) Non-potable water system for re-use purposes shall be marked in accordance with Section 12 of CAN/CSA-B128.1, "design and installation of Non-Potable water Systems".
(3) A sign containing the words Non-Potable water, Do Not Drinkshall be in letters at least 25 mm high with a 5 mm stroke and posted immediately above a fixture that is permitted to receive non-potable water.
7.7.3. Location
In Plain Language
Non-potable water systems and their outlets must be clearly marked as required by this article, so anyone using the system knows not to drink from it.
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.