What Is Backflow?
Water Corporation of WA Backflow Prevention Policy requires the installation of an approved backflow prevention device at the boundary of every water service connection to a property (including fire services).
Backflow is a reversal of the normal direction of water flow in a water supply plumbing system. It occurs when the water delivery main is at a lower pressure than the internal plumbing system (back siphonage). Back siphonage can occur when there is a burst or ruptured water main, or due to excessive demand during fire-fighting operations or other periods of high demand.
Backflow can also occur if a water pump, such as a bore pump, is cross connected to the internal water plumbing system, and is pumping bore water at a higher pressure than the water mains pressure (back pressure).
If a property’s drinking water supply is inadvertently connected with a source of pollution, either through a cross connection or simply a hose submerged in a container of liquid, then these pollutants could enter the water supply when there is an overpressure on the private property side or a sudden drop in water mains pressure.
Why Install A Backflow Prevention Device?
The community has a right to protection from contaminated water as the result of a backflow incident. Contaminated water can cause health problems or death and because of this, there are obligations under legislation to install a backflow prevention device:
Because of the potentially serious nature of a backflow incident we can, in accordance with the regulations, serve a notice to you to install backflow devices at your property boundary. These regulations also mean that penalties of up to $5,000 and $500 per day will be issued if you are not compliant.
Under the regulations we also have the power to restrict or disconnect water services to protect the drinking water supply.
Who Can Install A Backflow Prevention Device?
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