Backflow Prevention Online Services

The Backflow Prevention Program aims to reduce the chance of water contamination from backflow incidents that may happen at cross connections.

To learn more visit Backflow Prevention Program.

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	Note: This function is only for  Facilities with an existing "Cross   Connection Control Info" sheet.

Helpful Resources

• Property Owners User Guide (PDF)
• Qualified Persons User Guide (PDF)
• Instructions to Submit a Backflow Preventer Test & Inspection Report
  • Scenario 1 An Existing Device Recorded in the City's Database (PDF)
  • Scenario 2 Replacement of an Existing Device Recorded in the City's Database (PDF)
  • Scenario 3 A Device not Recorded in the City's Database and Scenario 4 New Device (PDF)
• Instructions to Submit a Cross Connection Control Survey Report (PDF)
• Instructions to Submit a Device Upgrade Implementation Report (PDF)

List of Qualified Persons

All Qualified Persons must register with the city before doing any backflow prevention work in Markham. The Qualified Person's registration is free. See the List of Qualified Persons [PDF] currently registered with the City.

Three type of reports are required by the Backflow Prevention Program

1. Cross Connection Control Survey
2. Backflow Preventer Testing and Inspection Report Form
3. Device Upgrade Implementation Form

The personal information on this form is collected under the authority of the Municipal Act, 2001. The information collected will be used by the City of Markham to administer Markham’s Backflow Prevention Program and enforce the Backflow Prevention By-law #2012-27. Questions about this collection can be directed to the Environmental Services Department, City of Markham, 8100 Warden Avenue, Markham, Ontario, L6G 1B4, 905.475.4862, backflow@markham.ca