8.6.2.2.Other Treatment Units (See Note A-8.6.2.2.)

(1) Except as provided in Sentence (2), a treatment unit, other than a septic tank, shall be designed such that the effluent
  does not exceed, for the level of the treatment unit set out in Column 1 of Table 8.6.2.2., the maximum concentrations set
  out opposite it in Columns 2 and 3 of Table 8.6.2.2.

                                                         Table 8.6.2.2.
                                         Other Treatment Unit Effluent Quality Criteria
                                          Forming Part of Sentences 8.6.2.2.(1) and (2)

                          Classification of Treatment Unit(1)           Suspended Solids(2)         CBOD5(2)
                                        Level II                               30                     25
                                        Level III                              15                     15
                                       Level IV                                10                     10
                                       Column 1                                 2                      3

                 Notes to Table 8.6.2.2.:
                 (1) The classifications of treatment units specified in Column 1 correspond to the levels of
                     treatment described in CAN/BNQ 3680-600, “Onsite Residential Wastewater Treatment
                     Technologies.”
                 (2) Maximum concentration in mg/L based on a 30 day average.

  (2) A treatment unit that is used in conjunction with a leaching bed constructed as a shallow buried trench, Type A
  dispersal bed or Type B dispersal bed shall be designed such that the effluent does not exceed the maximum
  concentrations set out opposite a Level IV treatment unit in Columns 2 and 3 of Table 8.6.2.2.

  (3) All treatment units referred to in Sentences (1) and (2) that contain mechanical components shall be equipped with
  an audible and visual warning alarm so located to warn the occupants of the building served or the operator of the
  treatment unit of a malfunction in the operation of the treatment unit.

  (4) All treatment units referred to in Sentences (1) and (2) shall permit the sampling of the effluent.

  (5) A treatment unit is deemed to comply with Sentences (1) and (2) if it has been certified to CAN/BNQ 3680-600,
  “Onsite Residential Wastewater Treatment Technologies” using a temperature condition listed under option a) or b) of
  Clause 8.2.2. of that standard. (See Note A-8.6.2.2.(5))

  (6) Every operator of a treatment unit shall obtain, from the manufacturer or distributor of the treatment unit, literature
  that describes the unit in detail and provides complete instructions regarding the operation, servicing, and maintenance
  requirements of the unit and its related components necessary to ensure the continued proper operation in accordance with
  the original design and specifications.

This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.

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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.