Backflow Prevention & Testing

    A backflow prevention device is something that is fitted to the water pipe on a property to stop the flow of water moving back into the mains water system which can occur if there is a difference or drop in water pressure. If you have backflow water issues, there is a risk that potentially contaminated water containing hazardous bacteria and debris could flow back up into your water service.

    Backflow testing or RPZ Testing is a very important safety measure for our water supply prevent backflow we need to install backflow prevention devices, the type of device will depend on what the hazard is. Below are the backflow prevention device types and the hazard ratings.

    Backflow prevention devices stop backflow siphonage problems by using a one-way valve, an air gap or a break tank.

    Premises That May Need A Backflow Device

    Due to the serious consequences of the backflow of water into Sydney’s water supply, it is extremely important backflow prevention devices are installed by certified professionals and tested yearly. Some types of premises that may require backflow prevention devices include:

    • Cafes and restaurants
    • Shopping centres and high-rise buildings.
    • Mechanic workshops
    • Car washes
    • Swimming pools
    • Laundries and dry cleaners
    • Golf courses or sporting ovals
    • Caravan parks
    • Manufacturing premises
    • Medical facilities such as hospitals and veterinary clinics
    • Chemical plants

    Premises That May Need A Backflow Device

    Due to the serious consequences of the backflow of water into Sydney’s water supply, it is extremely important backflow prevention devices are installed by certified professionals and tested yearly. Some types of premises that may require backflow prevention devices include:

    • Cafes and restaurants
    • Shopping centres and high-rise buildings.
    • Mechanic workshops
    • Car washes
    • Swimming pools
    • Laundries and dry cleaners
    • Golf courses or sporting ovals
    • Caravan parks
    • Manufacturing premises
    • Medical facilities such as hospitals and veterinary clinics
    • Chemical plants

    How Much Does An RPZ Valve Cost?

    A RPZ Valve will cost between $1,000 and $3,000 depending on the size of the property it has to service. Property sizes will require different size copper mains pipes that can vary greatly in size for different applications depending on what it is feeding & the materials required e.g. commercial building vs single story house vs a block of units

    How Much Does RPZ Testing Cost?

    An RPZ Valve Test in Sydney will cost between $200 and $300 depending on the location, time of day & type of property. The cost to get one installed will generally be between $500 to $800 but this will depend on the valve used and labour required. Depending on the situation this can vary between 2 and 8 hours based on access, the property type, size of the valve and required plumbing changes.

    Backflow Device Types

    There are 3 types of backflow protection installation methods. Containment protection: Device installed at the property boundary, just downstream of the meter assembly serving the property, including all fire services located at the boundary. Zone protection: Device isolates an area or building within the property. Individual protection: Device installed at point of potential contamination within the property.

    Below is a snippet from the AS-NZS 3500-1 Section 4.3: Cross-Connection Hazard Rating. Cross-connections are rated using three degrees of hazard:

    • 1.High Hazard: Any condition, device or practice that, in connection with the water supply system, has the potential to cause death.

    • 2.Medium Hazard: Any condition, device or practice that, in connection with the water supply system, has the potential to endanger health.

    • 3.Low Hazard: Any condition, device or practice that, in connection with the water supply systems, constitutes a nuisance but does not endanger health or cause injury.

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