Backflow Prevention

At Off Grid Plumbing, we provide reliable backflow prevention services across Melbourne, helping homeowners, businesses, and commercial property managers keep their drinking water safe. Our qualified plumbers are licensed to install, test, repair, and certify backflow prevention devices in compliance with Victorian plumbing regulations.

Backflow is a serious risk that can lead to contaminated water entering your supply, putting your health and the wider community at risk. That’s why councils and water authorities require many properties to have tested and approved backflow prevention systems in place.

Whether you need a new device installed, annual testing, or emergency repairs, our team is here to make the process simple, professional, and stress-free.

What Is Backflow?

Backflow occurs when water in your plumbing system flows in the opposite direction to its intended path. Instead of clean drinking water moving from the mains into your property, contaminated water can be siphoned back into the supply due to changes in pressure.

This contamination can include:

• Chemicals (fertilisers, cleaning products, industrial waste)

• Bacteria and viruses

• Sediment or dirty water from irrigation systems

• Hazardous substances from industrial processes

Because backflow poses such a serious health risk, strict laws exist in Victoria requiring certain properties to have approved backflow prevention devices installed and tested annually.

Why Backflow Prevention Matters

Backflow isn’t just a plumbing issue, it’s a public health concern. If contaminated water enters the mains supply, it can affect not only your home or business but also your neighbours and the wider community.

Here’s why backflow prevention is critical:

• Protects your drinking water – Keeps your taps free from harmful contaminants.

• Required by law – Councils and water authorities mandate testing and certification for medium and high-risk properties.

• Avoids fines – Failing to have your device tested and certified annually can lead to penalties or disconnection.

• Peace of mind – Knowing your water supply is safe for your family, staff, and customers.

Backflow Prevention Services We Offer

At Off Grid Plumbing, we provide a full range of backflow prevention services in Melbourne:

Backflow Device Installation

We install approved backflow prevention devices tailored to your property’s risk level. From domestic homes with irrigation systems to large commercial and industrial sites, we ensure the correct device is fitted to meet local regulations.

Backflow Testing and Certification

Victorian regulations require annual testing of backflow prevention devices by a licensed plumber. Our team provides full testing and certification, submitting results directly to your local water authority to keep your property compliant.

Backflow Repairs and Maintenance

If your device fails its annual test, we provide fast and effective repairs or replacements to restore compliance. We carry a wide range of parts and devices to ensure minimal downtime.

Backflow Risk Assessments

Not sure if you need a device? We can assess your property and provide a professional recommendation based on your usage, plumbing layout, and water authority requirements.

Who Needs Backflow Prevention in Melbourne?

Not every property requires backflow prevention, but if there’s any chance of contaminants entering the water supply, you’ll need a device.

Typical examples include:

• Homes with irrigation systems or rainwater tank connections

• Commercial kitchens, restaurants, and cafés

• Medical facilities and dental surgeries

• Factories and workshops using chemicals or machinery

• Car washes and laundries

• High-rise buildings with complex water systems

If your property falls into a medium or high-risk category, you’re legally required to have a backflow prevention device installed and tested annually.

Types of Backflow Prevention Devices

There are several types of backflow devices, each designed for different risk levels and applications:

• Atmospheric Vacuum Breakers (AVB) – Suitable for low-risk applications like garden irrigation.

• Double Check Valves (DCV) – Common for medium-risk sites, such as commercial kitchens.

• Reduced Pressure Zone Devices (RPZD) – Required for high-risk sites where hazardous contaminants may be present.

Our plumbers are fully licensed to install and test all types of backflow devices across Melbourne.