7.4.5.2.Traps for Storm Drainage Systems

(1) Where a storm drainage system is connected to a combined building sewer or a public combined sewer, a trap shall
  be installed between any opening in the system and the drain or sewer, except that no trap is required if the opening is
  the upper end of a leader that terminates
  (a) at a roof that is used only for weather protection,
  (b) not less than 1 m above or not less than 3.5 m in any other direction from any air inlet, openable window or door,
        and
  (c) not less than 1.8 m from a property line.
  (See Note A-7.4.5.2.(1))

  (2)   A floor drain that drains to a storm drainage system shall be protected by a trap that
  (a)   is located between the floor drain and a leader, storm building drain or storm building sewer,
  (b)   may serve all floor drains located in the same room, and
  (c)   need not be protected by a vent pipe.

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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.