Backflow Prevention

City West Water is continuing to keep Melbourne’s drinking water safe with an audit of backflow prevention devices in the CBD and inner and western suburbs.

Backflow occurs when water flows opposite to its normal or intended direction.

A properly working and maintained backflow device will ensure water flows safely by trapping water that begins to flow in the wrong direction.

  • City West Water is continuing to keep Melbourne’s drinking water safe with an audit of backflow prevention devices in the CBD and inner and western suburbs.

    Over 19,000 non-residential customers will be audited in the program. Initially, customers will need to inform City West Water if they have a backflow device, the type of device they have and if it has been tested by a licensed plumber.

    The risk ratings of a property will determine what type of device will need to be installed. Properties are classed as low, medium or high risk. An accredited plumber can confirm the risk rating of your property.

    Accredited plumbers will supply City West Water with test results from each premises with a backflow device. Customers who do not have a device will be responsible for having one installed and if the device is testable, the test results must be forwarded to City West Water to be registered.

  • Installing a backflow prevention device ensures that water from a property cannot be drawn back into the main drinking water supply. There are a number of different backflow prevention devices available. The type of device required will depend on the risk rating of the property with the potential hazard.
  • It is the property owner's responsibility to ensure that the correct backflow device is installed on their property. A licensed backflow plumber can inspect a premises and advise the property owner of the appropriate backflow prevention device(s) needed.
  • To arrange for a backflow assessment of your property, or the testing or installation of a backflow device, you can search for a licensed plumber (with backflow accreditation) in the Yellow Pages.  
  • City West Water is continuing to keep Melbourne’s drinking water safe with an audit of backflow prevention devices in the CBD and inner and western suburbs.

    Over 19,000 non-residential customers will be audited in the program. Initially, customers will need to inform City West Water if they have a backflow device, the type of device they have and if it has been tested by a licensed plumber.

    The risk ratings of a property will determine what type of device will need to be installed. Properties are classed as low, medium or high risk. An accredited plumber can confirm the risk rating of your property.

    Accredited plumbers will supply City West Water with test results from each premises with a backflow device. Customers who do not have a device will be responsible for having one installed and if the device is testable, the test results must be forwarded to City West Water to be registered.

  • The Backflow Prevention Containment Guidelines have been developed to be used in conjunction with the current policy and will better assist customers in complying with City West Water’s backflow prevention requirements.

    The document encompasses the varying aspects of backflow prevention and City West Water’s commitment to maintaining a collaborative approach with property owners when managing the changing demands for reticulated water supply including alternative water supplies.

  • For more information, download the backflow information sheet or backflow policy available on the top right of this page.

    You can also download detailed information on backflow from the Plumbing Industry Commission at www.pic.vic.gov.au

    Test reports or general backflow correspondence can be sent to:

    Backflow Prevention Program
    City West Water
    Locked Bag 350
    Sunshine Vic 3020

    Alternatively you can email backflow correspondence to backflow@citywestwater.com.au or fax to 9313 8126.