7.7.2.1.General

(1) For the purposes of this Subsection, rainwater shall mean storm water discharged from an above-ground roof surface.
  (See Note A-7.7.2.1.(1))

  (2) For the purposes of this Subsection, a non-potable rainwater harvesting system shall mean a storage tank, a pump,
  pipes, fittings and other plumbing appurtenances used to collect and distribute rainwater, but shall not include a rain barrel
  not connected to a plumbing system.

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.