If you do not have appropriate backflow prevention devices you may be fined up to $5,000 and $500 per day (see Backflow Prevention at the Water Corporation).
Backflow is where there 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, which leads to backsiphonage. Backsiphonage 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 (backpressure).
If a property's drinking water supply is inadvertently interconnected 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.
Due to the potentially serious nature of a backflow incident, the Water Corporation can, in accordance with Regulations 42 and 43 of the Water Services Regulations, serve an order on a property owner or occupier to install backflow devices. The regulations also provide for penalties for non-compliance of the Water Services Act 2012 WA). The Water Corporation has the power to restrict or disconnect water services, to protect the drinking water supply from potential contamination caused by a backflow event from your property.
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