How to Ensure Proper Backflow Prevention

Backflow refers to the unintended reversal of water flow, where water moves from your property back into the public water supply. This situation can be dangerous as it may carry contaminants that threaten public health.

In Australia, water supply safety is taken seriously, which is why backflow prevention devices are a legal requirement. But how do these devices work, and what do you, as a property owner, need to know? This blog will help you stay informed about backflow prevention and how to protect your home and community.

What Exactly is Backflow?

As mentioned briefly before, backflow happens when water flows backward into the public water system. This reversal can occur due to a drop in water pressure, causing the water to flow the wrong way. Common causes of backflow include:

• A main water break, causing sudden pressure loss in the pipes.
• Pumps that increase water pressure on your property.
• A faulty plumbing system, such as cross-connections between potable water systems and non-potable systems. Think irrigation or wastewater lines.

Contaminants from the environment or from your property, such as chemicals, bacteria, and other pollutants, can enter the drinking water system via these backflow events, posing significant health risks.

Your Responsibility for Backflow Prevention

In Sydney, property owners are responsible for installing the correct backflow prevention device and maintaining it. Here’s what you need to do:

1. Hire an Accredited Backflow Plumber

Reach out to a licensed plumber to assess your property’s hazard rating, which determines the type of device needed. The plumber will test the device after installation and conduct annual checks to ensure it’s working correctly.

2. Comply with Backflow Prevention Requirements

Sydney’s backflow prevention regulations require you to use the right device based on your property’s hazard level. High-risk properties, such as hospitals, need an RPZ, while lower-risk homes will only need a basic backflow valve.

3. Test the Device Annually

Your backflow prevention device must be tested annually, and the results should be submitted to Sydney Water within 2 days. If the device is found to be faulty, it should be repaired or replaced without delay.

Types of Properties and Their Backflow Requirements

Depending on the level of risk associated with your property, you’ll need different types of backflow devices.

1. Low Hazard Properties

If your property is considered a low hazard, like a residential home without a pool or irrigation system, a non-testable backflow device will suffice. These are often installed as part of the water meter. Since the risk of contamination is low, these devices don’t require regular testing, offering a cost-effective and easy solution for water safety.

2. Medium Hazard Properties

These properties, such as commercial buildings, apartment complexes, and schools, require a double-check valve assembly. This device ensures that any potential backflow is prevented, providing a reliable barrier to protect the water supply from contamination.

3. High Hazard Properties

For high-risk properties, like hospitals, factories, or businesses dealing with hazardous materials, a break tank, RPZ, or air gap device is necessary. These devices are more advanced and provide extra protection against backflow.

Understanding Backflow Prevention Devices

1. Double Check Valve Assembly

This type of device is used for medium-risk properties. It contains two check valves that prevent backflow by creating two barriers to stop water from reversing direction.

2. Reduced Pressure Zone (RPZ)

For high-risk properties, an RPZ valve is used. It not only stops backflow but also reduces the pressure in the system. This device is often used in businesses that deal with chemicals or other hazardous materials.

3. Air Gap

An air gap is a physical separation between your plumbing system and the public water supply. This is a reliable way to ensure backflow doesn’t occur and is used in higher-risk areas.

4. Break Tank

A break tank is an advanced solution used in industrial or large commercial settings. It separates the public water supply from your property’s plumbing system by storing water in a tank before it enters the property. This system helps maintain stable pressure, preventing backflow even when fluctuations in water pressure occur.

Conclusion

Backflow prevention is crucial for protecting the water supply and ensuring your property meets Sydney’s regulations. By installing the right device and scheduling regular tests, you can keep your water clean and safe from contaminants.

For expert backflow prevention solutions, call our team of plumbers in Sydney at Fix N Flow! Reach us at 1300 319 275 or fill out our online form to get started today. We’re here to safeguard your property and the community!