As we know, the Ontario Building Code (OBC) implemented changes to the requirements for Treatment Units as outlined in Article 22.214.171.124. which took effect January 1, 2017. These changes included the removal of Supplementary Standard SB-5 for Approved Treatment Units, and a new reference to the CAN/BNQ 3680-600 standard for certification of treatment units.
In the code change proposals, records of public consultation, and statements previously made by Ministry of Municipal Affairs (MMA) staff and Minister over the last several years, it was very clear that the intent was to make certification to CAN/BNQ 3680-600 mandatory for all treatment units in Ontario, as the new minimum standard. The emphasis was for treatment units that are to be used with smaller final polishing and dispersal options including Shallow Buried Trenches, Type A and Type B Dispersal Beds, or reduced size Filter Beds and Absorption Trenches to be tested rigorously in a cold climate for 12 continuous months with realistic stress conditions. Read more