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Backflow Prevention Program

Effective January 1, 2018

For an overall description of Public Works-Environmental Services’ Backflow Prevention Program and prior to applying for a building permit please refer to Backflow Prevention Program or email

Are you the owner of an existing building who is now required to install a new backflow assembly, relocate a working assembly or replace a defective assembly? If so, you must apply and obtain a building permit before starting any work on the plumbing system.

Clients may contact Building Code Services at 613-580-2424, ext. 29312 or email for questions regarding their permit application.

Approximate timeline

  • Plumbing Only - First review 5 business days, Council approved timeline

Your Building Inspector must confirm that the new or relocated Backflow Assembly complies with the requirements of the Ontario Building Code and the referenced standard, CSA B64.10-11 for Premise Isolation. Additionally, the Inspector must verify the device has passed testing by a Qualified Tester as described in the amended Water By-law.

The permit plans and specifications must be on site and made available to the Building Inspector at the time of inspection. To ensure the availability of a Building Inspector, you should book your inspection 48 hours in advance. The Building Inspector name and phone number is identified on the building permit.

Building Code Service counters are open for personal services by appointment only. This includes the submission of permit applications, payment of fees and the issuance of permits. 

There are various methods for submitting applications.

Application Forms: Application for a Permit to Construct or Demolish