A correctly selected backflow prevention device (one-way valve) will eliminate any risk of contamination of the drinking water supply. Backflow devices are either testable or non-testable types with the selection dependent on the risk associated with the possible contamination.

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A correctly selected backflow prevention device (one way valve) will eliminate any risk of contamination of the drinking water supply.

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A backflow prevention certificate (Form 9) must be issued by a licensed plumber (for backflow certification) of your choice and sent with your application to hire a standpipe or access potable water fill stations or recycled water fill stations.

Some commercial activities will require backflow prevention and containment devices to protect the water supply from potential contamination.

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Unitywater respectfully acknowledges the Traditional Owners and custodians of the land and waters of the region in which we operate. We pay our respects to Elders past, present and emerging.

Application and registration of a backflow prevention device is managed by your local council. For more information please contact:

Backflow occurs because a condition exists in a water supply system that will cause back-siphonage or back-pressure. Back-siphonage can occur on a property through a vacuum created in the water supply system. An example of back-siphonage would be a pipeline breakage, undersized pipework or high withdrawal rates. Back-pressure can occur within properties when high pressure is generated downstream by pumps, thermal expansion or elevation. Backflow prevention starts within a property boundary by isolating a possible contamination source from the town mains or storage tanks (rainwater tanks) from the tap or appliance.

A backflow device prevents water accidentally siphoning out of the tank back into the supply pipe if the pressure drops unexpectedly.