QBCC no. 1191153 Master Plumbers' Association of Queensland


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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