Backflow Prevention and Testing Perth

Backflow Testing and repairs by Zambezi Plumbing and Gas

Firstly what is a Backflow Device?

A backflow device is a valve that prevents contaminated water flowing backwards into our drinking water system. It prevents the water changing direction when the mains water delivery pressure is lower than than the internal plumbing system.(back siphonage)  Back siphonage occurs where there is a burst pipe, a ruptured water main, or excessive demand on the water supply.

So to prevent back siphoning of contaminated water into our drinking water supply we install backflow devices. Simplified the valve only allows the water to flow in one direction. If the water tries to go backwards the valve shuts off stopping it and preventing contamination.

Did you know:

  •  It is a legal requirement that all backflow devices should be tested annually by a licensed plumber?
  •  You must have a compliant backflow device for you to be connected to the water supply?

Regulations Regarding Water

There are many different possible contaminates such as chemicals, acids and fertilisers. Contaminates like these can cause significant health problems or even death. As a result there are obligations under legislation to install a backflow prevention device:WA has Legislated to prevent this happening by the installation of backflow prevention devices.

  • Water Services Act 2012
  • Water Services Regulations 2013.

These regulations also carry penalties of up to $5,000 and $500 per day if for non-compliance.

Backflow Commissioning and Testing

Backflow devices are registered with water corp and commissioning and testing must only be carried by a licenced plumber. The devices require annual testing by a specialised plumber and undergoes specific tests to determine its compliance. Once tested a report must be completed and submitted it to the water corporation within 5 days.

Zambezi Plumbing and Gas are committed to ensuring that we all have safe drinking water. We undertake both commissioning and testing of units and have all the required licences and equipment. We also undertake testing on all other types of valves so please call us to discuss your needs.


We are more than happy to give advice on which solution is most suitable for your needs, depending on your Plumbing requirements. Why not ask us to view your property and discuss the various options with you now!