If you own or manage a commercial, industrial, or multi-residential property in Perth, you’ve likely received a notice from the Water Corporation of WA about your backflow prevention device. For many, this annual letter is a reminder of a critical but often misunderstood compliance obligation.
This isn’t just about paperwork or ticking a box. It’s about a fundamental aspect of public health and safety: protecting our community’s drinking water.
As we head into the 2026 compliance year, this guide will explain in simple terms what backflow is, why it poses a serious risk, and what your legal obligations are for backflow testing and compliance in Perth.
What is Backflow and Why is it Dangerous?
Think of the water supply system as a one-way street. Clean, potable water flows from the public main into your property for you to use. A backflow prevention device is like a high-tech check valve or traffic spike, ensuring that water can only travel in one direction.
Backflow is the term for the undesirable reversal of this flow, where water from your property travels backwards into the public drinking water supply.
This reversal can happen in two main ways:
- Back-siphonage: This occurs when the pressure in the public water main suddenly drops (due to a burst pipe or firefighting use nearby), creating a siphon effect that can pull contaminated water from your property back into the main.
- Back-pressure: This happens when a system on your property, such as a pump, boiler, or pressurized vessel, creates a pressure that is higher than the main water supply, forcing contaminated water backward.
The danger is clear. Water on a commercial property can be exposed to a huge range of contaminants—chemicals, industrial by-products, fertilizers from irrigation systems, bacteria, and detergents. If this contaminated water flows back into the public supply, it can pose a severe health risk to the community. This is why backflow prevention in Perth is so rigorously regulated.
Your Legal Obligations: The Water Corporation of WA Requirements
To mitigate this public health risk, the Water Corporation of WA, under the state’s plumbing regulations, mandates the installation and maintenance of backflow prevention devices on all high and medium-risk properties.
The key requirement for property owners is this: All testable backflow prevention devices must be inspected, tested, and certified by a licensed and accredited plumber at least once every 12 months.
This applies to most commercial, industrial, and multi-residential properties that have systems such as:
- Commercial irrigation systems
- Fire hose reels and hydrant services
- Swimming pools or spas
- Commercial kitchens and laundries
- Medical or laboratory facilities
- Vehicle washing bays
The compliance process is straightforward. The Water Corporation will issue you an annual reminder notice. It is then your responsibility to engage a licensed professional to perform the test and submit the compliance report (Form 8) before the due date.
The Backflow Testing Process: What to Expect
A professional backflow test is a quick, non-disruptive procedure that ensures your device is functioning perfectly. When a Safetytech technician arrives on site, here’s what the process looks like:
- Notification: We will notify you or the on-site contact before briefly interrupting the water supply to the device being tested.
- On-Site Test: Our licensed plumber will connect a specialised, finely calibrated gauge kit to the test points on your backflow device. They will then perform a series of controlled pressure checks to verify that the internal valves and check mechanisms are sealing perfectly and preventing any possibility of backflow.
- Reporting and Certification: Upon a successful test, our technician completes and submits the official Form 8 compliance report directly to the Water Corporation on your behalf. We handle all the paperwork, giving you one less thing to worry about.
- Repairs and Maintenance (If Required): If a device fails the test, its internal components may be worn or fouled with debris. Our qualified team can perform on-the-spot servicing and repairs, or quote for a full replacement if necessary, to bring your property back into full compliance.
Partner with Safetytech for Backflow Prevention in Perth
Managing your property’s various compliance obligations can be complex. Safetytech makes your annual backflow testing and compliance simple, streamlined, and stress-free.
Our team of licensed and accredited plumbers are specialists in backflow prevention in Perth. We handle everything for you, from conducting the professional on-site test with certified equipment to managing and submitting all the necessary paperwork to the Water Corporation.
We can also manage your annual testing schedule, sending you a convenient reminder well before your compliance is due, so you never have to worry about missing a deadline or facing potential penalties.
Contact Safetytech today to book your backflow testing service and ensure your property is safe, compliant, and doing its part to protect our community’s water supply.
Conclusion: A Small Test for a Big Responsibility
Your annual backflow test is a small, simple procedure that fulfils a major legal and public health responsibility. It’s a non-disruptive check-up that ensures the integrity of your plumbing and, most importantly, protects our community’s most precious resource: our clean drinking water.