If you have received a backflow reminder or invoice from the City of Gold Coast, you are probably asking whether the annual test is really required and what happens if it slips. The short answer is yes for testable devices, and the obligation sits with the property owner. As a team that handles Backflow Prevention Gold Coast compliance for homes, businesses and strata buildings, we have set out exactly what Queensland law requires, which devices it applies to, and how to stay compliant without surprises.
This guide focuses on compliance. If you want a refresher on how backflow devices work, read our earlier article, What Does the Process of Backflow Prevention Involve?
How Often Does a Backflow Device Need Testing?
A testable backflow prevention device must be maintained and tested at least once every 12 months. This is set out in section 102 of the Queensland Plumbing and Drainage Regulation 2019, which requires the owner of the premises to arrange for a backflow prevention licensee to maintain and test the device at least once a year after it is registered.
“At least once a year” is the minimum. A device can be tested more often, for example after repairs, after a failed test, or where a business wants extra assurance. But it cannot go longer than 12 months between tests.
Is Backflow Testing Compulsory in Queensland?
Yes. Annual testing of registered testable devices is a legal requirement in Queensland, not a recommendation. The rules work in three layers:
- Local government must run a program to register each testable device in its area and monitor its maintenance and testing (section 101).
- The property owner must register the device and arrange annual maintenance and testing (section 102).
- The licensed plumber must notify council and the owner after installing, removing, maintaining or testing a device (section 103).
On the Gold Coast, the City of Gold Coast keeps the register, sends annual registration invoices and receives the test reports.
Does Every Backflow Device Need Annual Testing?
No. Only testable backflow prevention devices need annual testing. Many properties have backflow protection that is not testable and does not need a yearly test.
Whether a device is testable depends on its type and the hazard it protects against. Under the plumbing standard AS/NZS 3500.1, every property connection is rated by hazard:
| Hazard rating | What it means | Typical protection | Annual test required? |
|---|---|---|---|
| High | Backflow could cause death | RPZD, registered air gap, registered break tank | Yes |
| Medium | Backflow could endanger health | Double check valve | Yes |
| Low | A nuisance, not a health risk | Dual check valve, non-testable single check | No |
Most standard homes only have low hazard protection, usually a dual check valve built into or near the water meter. Commercial premises, irrigation systems and fire services are more likely to need testable devices.
Which Devices Must Be Tested?
The testable backflow prevention devices that must be registered and tested every year include:
- Reduced pressure zone devices (RPZD). Used for high hazard sites such as medical clinics, car washes, chemical dosing and some commercial kitchens.
- Double check valves (DCV). Common on medium hazard sites, fire services and larger irrigation systems.
- Pressure type vacuum breakers. Often found on irrigation systems.
- Testable single check valves. Single check valves with built-in test points.
- Registered air gaps. A physical gap between the water outlet and the receiving vessel.
- Registered break tanks. Tanks that create a physical break between the mains and a high hazard system.
A simple way to check: testable devices have test points (small ball valves or ports) where a tester connects gauges. If your device has them and appears on the council register, it needs an annual test.
Who Is Responsible for Arranging the Test?
The property owner is legally responsible. The council does not arrange the test, and neither does the plumber unless you book them. Under section 102, the owner must arrange for a backflow prevention licensee to maintain and test the device each year.
Some common situations:
- Rental properties. The obligation stays with the owner, even if the property manager books the work or the lease passes the cost to a commercial tenant.
- Strata buildings. Devices on common property are usually the body corporate’s responsibility as the owner of that property.
- New owners. When you buy a property, you take on its testable devices and their testing schedule. A reminder that went to the previous owner does not pause your obligation. Check the council register during or soon after settlement.
Can Any Plumber Perform Backflow Testing?
No. Only a licensed plumber who holds a backflow prevention endorsement on their QBCC licence can test, commission and maintain testable backflow prevention devices. The QBCC treats this as specialist endorsed work, so a standard plumbing licence alone is not enough.
Before booking, ask your plumber to confirm:
- They hold a current QBCC plumbing licence with a backflow prevention endorsement.
- Their test equipment is calibrated.
- They will lodge the test report with council for you.
If an unendorsed person tests your device, the test does not meet the Regulation and your device may still be recorded as overdue.
What Happens if I Miss My Annual Test?
Missing your annual test means your property is non-compliant, and it can cost you more than the test itself.
- Fines. Failing to arrange annual maintenance and testing carries a maximum penalty of 20 penalty units under section 102(4). With Queensland’s penalty unit at $172.70 from 1 July 2026, that is up to $3,454. Some councils treat each untested device as a separate breach.
- Council follow-up. Councils track overdue devices on their register and can issue compliance notices.
- Safety and liability risk. An untested valve may have failed without anyone knowing, leaving the drinking water supply unprotected. For businesses, that can create insurance and liability problems.
If your test is overdue, book it as soon as possible. Getting the device tested and the report lodged brings you back into line with the register.
Does the Plumber Submit the Results to Council?
Yes. Under section 103 of the Regulation, the licensed plumber must notify both the local government and the owner within 10 business days of maintaining and testing the device. This is done on the approved form, usually called a Form 9 test report.
On the Gold Coast, the report goes to the City of Gold Coast’s plumbing and drainage team, which updates the register for your device. You should receive a copy as well. Keep it with your property records, as it is your proof of compliance for the year.
The same 10 business day rule applies when a plumber installs or removes a testable device.
When Does the 12-Month Testing Period Start?
The 12-month cycle starts when the device is registered and commissioned, usually when it is first installed and tested. From then on, each annual test should be done no more than 12 months after the previous one.
In practice:
- New devices are tested at commissioning, and the next test is due within 12 months.
- Replaced devices start a fresh cycle from the replacement and commissioning test.
- Existing devices run 12 months from the last recorded test.
Council admin cycles vary across Queensland. For example, Brisbane City Council sets an annual testing deadline, while City of Moreton Bay runs registration renewals from 1 July to 30 June. On the Gold Coast, the City of Gold Coast renews registration annually by invoice. The safest approach is to book your test before 12 months have passed since the last one, and check your council’s reminder for any specific due date.
Do Non-Testable Devices Require Annual Testing?
No. Non-testable devices, such as dual check valves at the water meter and hose tap vacuum breakers, do not need annual testing and are not placed on the council register for testing.
That does not mean they need no attention. Non-testable devices can still wear out or be damaged, and a change in how a property is used can raise its hazard rating. For example, adding chemical dosing to an irrigation system, converting a home into a clinic, or installing a commercial kitchen may mean a testable device is now required. If your property’s use changes, have a licensed plumber reassess the backflow protection.
Backflow Compliance Checklist for Queensland Property Owners
- Find out whether your property has testable devices. Check the device for test points or request your backflow records from council.
- Make sure every testable device is registered with your local council.
- Book an endorsed backflow tester at least once every 12 months.
- Confirm the plumber lodges the Form 9 test report within 10 business days.
- Pay your council’s annual registration invoice.
- Keep copies of every test report.
- Reassess your backflow protection if the property’s use changes.
Stay Compliant With Plumb Professor
Plumb Professor’s endorsed plumbers provide annual backflow testing, repairs and device replacements across the Gold Coast. We test your devices, lodge the report with the City of Gold Coast and remind you when your next test is due, so your property stays compliant year after year.
Call 07 5551 5954 or get in touch online to book your annual backflow test.
