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Perth’s #1 Backflow Prevention Specialists

Backflow prevention keeps contaminated water from flowing backwards into the clean drinking supply, and in Western Australia it is a legal requirement for many properties. Plumbing Bros provides backflow prevention across Perth, from assessing your property's risk and installing the right device to carrying out the annual testing that keeps you compliant. Our licensed plumbers handle the whole process, including lodging your test report with the Water Corporation, so you do not have to chase the paperwork. We arrive on time, work with no call-out fees and free quotes, and deliver 5-star service on every job.

Backflow prevention is exactly the kind of compliance work that rewards doing things properly the first time, which has been the Plumbing Bros way since three local plumbers founded the company in Perth in 2017. Book your Perth plumber and that same care comes with them.

Backflow Prevention Perth
Perth Backflow Prevention

What Is Backflow and Why It Matters

Backflow is the reversal of the normal direction of water flow in a plumbing system. It can happen when there is a sudden change in water pressure, for example a burst water main, heavy demand during firefighting, or a property running at higher pressure than the mains. When that happens, water that may be contaminated can be drawn back out of a property and into the drinking water supply.

The risk is real. Think of a hose left sitting in a bucket of garden chemicals, a cooling tower, or a commercial process connection. Without protection, a drop in mains pressure could pull that contaminated water back into the shared supply. A backflow prevention device acts as a one-way gate, so water can only ever flow in the intended direction. Because the water network is shared, a single unprotected property can put others at risk too, which is why the rules exist.

Do You Need Backflow Prevention?

The Water Corporation requires an approved backflow prevention device at the boundary water service connection of many properties, including fire services, with the type of device matched to the property's risk rating. If you are not sure whether your property needs a device, the safest step is to have a licensed, accredited plumber assess your hazard level. We can do that for you and explain exactly what, if anything, is required.

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Backflow prevention generally applies to:

  • Commercial and industrial premises
  • Multi-dwelling properties such as units and complexes
  • Properties with an alternative water supply, such as a bore, rainwater or recycled water system
  • Properties with irrigation systems, cooling towers, or trade processes
  • Any site assessed as medium or high risk
Typical Risk Levels

Typical Risk Levels

Only an accredited plumber can determine your property’s official hazard rating, but these examples give a general guide:

  • High risk

    Car washes, chemical plants, laundries, hospitals and medical facilities, mortuaries, and premises with boilers, chillers or cooling towers.

  • Medium risk

    Caravan parks, commercial pools, spas and fountains, food and beverage processing, and irrigation on non-domestic properties.

  • Low risk

    Salons, in-line water softeners and filtration, domestic irrigation, and residential rainwater tanks.

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The higher the risk, the more robust the device required, and the more important regular testing becomes.

Backflow Prevention Devices We Install

The right device depends on your risk rating and the way your property uses water. We assess your property, recommend the correct device for your risk rating, and install it in the right location to Australian Standards and Water Corporation requirements.

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Approved types we supply, install and test:

  • Reduced Pressure Zone Devices (RPZD) for high-risk premises, offering the highest level of protection
  • Double Check Valve Assemblies (DCVA) for many medium and lower-risk applications
  • Registered break tanks with an air gap where required
  • Testable and non-testable check valves suited to lower-risk and fire-service applications
Our Backflow Services

Our Backflow Services

Everything a compliant backflow device needs, from the first assessment to the yearly test.

  • Risk assessment

    Risk assessment

    We determine your property's hazard rating and advise what device, if any, is required.

  • Backflow device installation

    Backflow device installation

    Supply and compliant installation of the right device at the correct point.

  • Annual backflow testing

    Annual backflow testing

    Testable devices must be tested every year by an accredited tester to stay compliant.

  • Repairs and maintenance

    Repairs and maintenance

    If a device fails a test or wears over time, we repair or replace it.

  • Water Corporation lodgement

    Water Corporation lodgement

    We submit your test report through the Water Corporation's online lodgement system on your behalf.

  • Annual test reminders

    Annual test reminders

    We can keep track of when your next test is due and get in touch, so you never miss a compliance deadline.

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Why Annual Testing Matters

A backflow prevention device is not "set and forget." Over time, wear, debris and pressure changes can stop a device working the way it should, and a device that fails silently offers no protection at all. That is why testable devices must be tested every year by an accredited backflow tester. Annual testing confirms the device still works, keeps your property compliant, and protects everyone connected to the supply. Miss it, and you can face compliance notices, so it pays to stay on top of the schedule, or let us track it for you.

Backflow Preventer Installation Perth
Backflow Prevention Device Install Perth

Our Process

  1. Get in touch. Call us or book online and tell us about your property and what you need.
  2. Assess. We determine your risk rating and confirm what device and testing your property requires.
  3. Upfront quote. You get a clear, fixed price before any work begins. No call-out fee, no hidden extras.
  4. Install or test. We install the correct device, or carry out your annual test, with minimal disruption to your water supply.
  5. Lodge and remind. We lodge your report with the Water Corporation and can remind you when your next annual test is due.

Why Customers Choose Plumbing Bros

★ 4.7 Rating | Trusted by 1000’s of Aussies

  • 10,000+ customers
  • 25,000+ jobs completed
  • 1,187+ customer reviews
Get in Touch

Contact Perth

Plumbing Bros Perth is fully licensed, locally staffed, and on standby around the clock. Use the details below to book a job, ask a question, or get a quote.

Phone Number 1300 583 089
Email service@plumbingbros.com.au
License Numbers PL 9535 | GL 016672

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Have more questions, or want to request a free quote? Get in touch with us and someone from your local team will be in touch as soon as possible!





    Frequently Asked Questions

    What is a backflow prevention device?

    It is a valve or assembly fitted to your water service that only allows water to flow in one direction, so contaminated water cannot be drawn back into the clean drinking water supply.

    Does my property need backflow prevention?

    Many commercial, industrial and multi-dwelling properties do, along with sites that have irrigation, an alternative water supply, or are assessed as medium or high risk. The best way to know is to have an accredited plumber assess your property.

    How often does a backflow device need testing?

    Testable devices generally need testing every year by an accredited backflow tester to remain compliant. Higher-risk sites may need more frequent attention.

    Do I have to lodge a test report?

    Yes. Backflow test reports need to be lodged with the Water Corporation. We can submit yours through their online lodgement system for you.

    Who can test or install a backflow device?

    Backflow installation and testing must be carried out by a suitably licensed and accredited plumber. Our team handles both.

    How much does backflow testing cost in Perth?

    It depends on the device type, the number of devices and access. We give you a clear, upfront quote before any work, with no call-out fee, and discounts may apply where multiple devices are tested at the same property.

    What happens if my device fails the test?

    We will explain the issue and quote to repair or replace the device so it passes and your property stays compliant.

    Can you remind me when my next test is due?

    Yes. We can track your annual testing schedule and get in touch when your next test is coming up.