In Sydney, installation and prescribed testing of a testable backflow prevention device must be handled by a licensed plumber with the authorisation or specialist accreditation required for that work. A testable device generally requires testing when commissioned, every 12 months and after work that could affect its operation.
Who can install the device?
The installer must first confirm the connection, hazard rating, water-supplier requirements and approved device. Property owners should not choose from pipe size or an existing fitting alone. Check which backflow device the hazard assessment requires, then use our backflow prevention installation team or another appropriately qualified provider.
When is testing required?
Testing is generally required:
- when a testable device is installed and commissioned
- every 12 months after commissioning
- after relevant maintenance, repair or replacement
- when Sydney Water or the authority administering the connection directs it.
The annual requirement applies to registered testable devices, not every backflow fitting. A non-testable device does not undergo the same prescribed field performance test. If the device type or due date is unclear, check its identification tag, previous test report or authority notice and have the record confirmed professionally.
What happens after the test?
The authorised plumber uses calibrated test equipment, records the result and lodges the report through the approved channel for Sydney Water or the authority responsible for the connection. Keep a copy of the report and record the next due date.
A failed result does not always mean immediate replacement. Depending on the device, condition and parts, compliant servicing and retesting may be possible. Review why backflow preventers fail and when replacement is justified before approving a scope based only on age.
What does testing or installation cost?
There is no reliable fixed price without the device and site details. The quote depends on device type and size, access, isolation, number of devices, test equipment, reporting, authority requirements, travel, labour, materials, current market conditions and whether servicing, parts or replacement are needed.
Do not dismantle, bypass, adjust or test the device yourself. It protects the drinking-water supply and may contain pressurised water. Contact our accredited backflow testing service to confirm the due date, complete the test and arrange report lodgement where authorised.