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The construction and installation of small individual septic systems less than (10, 000 litres/day) is regulated under the Ontario Building Code. For further information on the Building Code requirements for these systems, please see the Ontario Building Code section of the Ministry of Municipal Affairs and Housing Affairs site.

The construction and installation of large septic systems (greater than 10,000 litres/day) is regulated by the Ministry of the Environment and…

…are subject to…	approval requirements for sewage works under Section 53 of the Ontario Water Resources Act
…and require a…	Sewage Works Certificate of Approval
…which is issued by…	the Environmental Assessment and Approvals Branch

For more information, the following resources are available in our Publications section:

• Guide for Applying for Approval of Sewage Works
• Application for Approval of Sewage Works