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Backflow devices

Backflow prevention is the term used to prevent the reverse flow of water from a potentially polluted or contaminated source into potable water supply.

Backflow is caused by cross connection. This is any point on a water system where a polluting substance may come in contact with drinking water. This may include any system piping that allows access to the drinking water supply, any connected auxiliary water supply, submerged inlets, by-pass arrangements, removable sections and temporary devices.

This is prevented by installing a backflow prevention device such as a one-way valve which prevents the contaminants from entering the drinking water supply. These are supplied in testable and non-testable types depending on the risk associated with the possible contamination. Testable devices require annual testing to ensure satisfactory operation.

Please note: Form 9 - Report on inspection and testing of backflow prevention devices, registered air gaps and registered break tank is available on the Department of Housing and Public Works website under the Plumbing and Drainage Act 2018.

The licensed plumber must submit the Form 9 to City of Gold Coast within 10 business days after inspecting or testing the device. The form can be emailed, posted or lodged in person at any of our customer service centres.

If you wish to post a Form 9, address it to:

Chief Executive Officer
City of Gold Coast
PO Box 5042

If you wish to email the Form 9, please email it to Plumbing&

For information, see the frequently asked questions below.

For any questions regarding backflow submission, please contact Plumbing and Drainage on 07 5667 5977.

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