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?
We do not publish guesswork price lists online because backflow prevention devices differ significantly in physical configuration, hazard rating and accessibility — a high-hazard Reduced Pressure Zone (RPZ) valve mounted at eye level in an accessible plant room involves very different testing procedures and differential-pressure equipment from a submerged boundary Double Check valve located in a traffic-rated pit requiring confined-space access. An on-site assessment ensures our accredited backflow plumber can evaluate the exact valve size, isolation access and line pressure to provide an honest, upfront fixed price before testing begins. Our technician walks you through a clear task breakdown of the steps involved — from calibrating differential test gauges and cleaning internal check-valves to lodging the mandatory compliance report with Sydney Water.
Testing must strictly follow AS/NZS 2845.3 (the Australian standard for field testing of backflow assemblies, which verifies that internal check valves and relief ports close reliably against reverse water flow) and AS/NZS 3500.1 (the national water services standard). Do not dismantle, bypass, adjust or test the device yourself. Fixed Today is Sydney's trusted authority for commercial and residential backflow containment, serving property owners across decades since 2011. Operating under NSW Fair Trading Contractor Licence 305428C with Qualified Supervisor oversight and certified backflow accreditation, we offer upfront fixed quotes and a $0 call-out fee on approved work. Contact our accredited backflow testing service to confirm your due date, complete the annual certification and lodge your report seamlessly.