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Installing a Backflow Prevention Device

AVB minimum backflow preventionInstallation of a suitable backflow prevention device ensures that the drinking water supplied by Southern Downs Regional Council is not contaminated due to a cross-connection. Water from your property/business may contain contaminants such as pesticides, detergents and other chemicals which has the potential to endanger health or to cause death.  

You can identify if a backflow prevention device is installed on your property by checking the requirements stated on the plumbing approval given by the Councils' Plumbing Inspector.  A backflow prevention device is required where there is risk of contamination to the water supply. The type of backflow device must conform to AS/NZS3500.1:2018 Appendix F.

Pre-Installation Hazard Assessment

A hazard assessment of the processes carried out on your property will determine what type of device is required to be installed.  There are three hazard ratings identified by AS/NZS 3500.1:2018 (Section 4):

  1. High hazard – any condition, device or practice that, in connection with the water supply system, has the potential to cause death. 
  2. Medium hazard – any condition, device or practice that, in connection with the water supply system, has the potential to endanger health.
  3. Low hazard – any condition, device or practice that, in connection with the water supply system, constitutes a nuisance but does not endanger health or cause injury.

Due to processes and procedures differing within business types, consultation with a licensed plumber (possessing current backflow endorsement) is recommended to provide advice on which backflow prevention devices are required for your property.

A licensed plumber holding current backflow endorsement will...

  • Conduct a hazard assessment of your property
  • Install appropriate hazard-rated devices on the property.
  • Inspect and test backflow prevention devices on the property.
  • Complete a backflow prevention device inspection and test report for each testable device.
  • Provide the test report within 10 business days of carrying out the relevant work to the owner of the premises and to Council.

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