QBCC no. 1191153 Master Plumbers' Association of Queensland

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Backflow prevention

What is Backflow?

Backflow is the contamination of potable (drinking) water supplies caused by anything from sewage to pesticides being drawn back up from a water outlet and into the water supply system.

How does Backflow arise?

Water is delivered into your property under mains pressure.  The mains pressure could fail for a variety of reasons such as:

  • Fire services using the main
  • Broken or damaged water main
  • Heavy water usage downstream in the main causing supply pressure reduction upstream

If a cross connection happens between the water supply and a contaminated source and a pressure drop occurs in the water main for any of the above reasons, a vacuum could be created.  If this forms back siphoning and draws liquid from a contaminated source back to the water supply, then this will pose a serious risk to public health.A range of property types that could potentially be a risk to public health include:

  • Hospitals
  • Vets
  • Factories
  • Housing Complexes
  • Refineries
  • Laundries
  • Industrial Units
  • Restaurants
  • Supermarkets
  • Farms
  • Chemical plants
  • Nurseries
  • Sporting arenas /golf courses
  • Irrigation

Backflow Prevention

Installation and maintenance of a backflow prevention device used to protect the water supply from contamination.

Backflow devices are either testable or non-testable.

Each backflow device is registered with the local council and monitored for annual testing.

An owner of a testable backflow device must ensure that the device is registered with the local government and have the device inspected and tested annually.

Only a qualified backflow plumber is able to test and install a backflow device.

Pathfinder Plumbing are fully endorsed to legally carry out all of your backflow requirements from the installation to testing and certification.

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0448 895 588


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