
The OBC assumes that for every bedroom, 2 people could be living in the residence. Most people assume it is based on the number of bathrooms or current occupants, but that is not the case. Step 1: Calculate the maximum daily flow, as per the OBC calculation.Īll daily flow calculations start with the number of bedrooms.

The two main factors that dictate the size and design of a septic system are the maximum daily flow and soil/site conditions.

Local governing authorities may have additional by-laws in place requiring additional design requirements. The following guide has been put together to assist you with meeting minimum OBC regulations for residential septic systems. It is the homeowners responsibility to contact local governing authorities and acquire the necessary permits associated with the septic system installation or repair. The system must be built to meet the maximum use possibility of the residence in case the property is sold to new owners or changed from seasonal use to a year round residence. The average 3-4 bedroom house is rated at 2000L.Īll systems must be built according to the OBC regardless of how the residence will be used such as seasonal cottage use or low occupancy numbers.
Ontario building code space around cooking range how to#
Here is a quick guide to help you with how to design a new system.Īll septic systems that are within a single lot and rated to accept a total daily flow rate of <10,000 L must comply with the Ontario Building Code (OBC).
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The building code can be quite intimidating and confusing.
