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Backflow Prevention

About backflow prevention

Shoalhaven Water has a responsibility to provide safe drinking water to our community from the point of treatment to the point of use.

It is the responsibility of any commercial or industrial property owner to ensure that they do not affect the mains supply with any contaminated water from their property. Working together we can protect public health and protect the environment.

What is Backflow?

Backflow is the unwanted flow of potentially contaminated water into the potable (drinking) water supply. Our water distribution system is designed to ensure that water flows to a property under pressure, if this pressure is not maintained there is a chance that water could be drawn from a property back into the main water supply.

Backflow can occur in two ways:

  • Back Siphonage is a condition that can occur when a negative pressure occurs in the main and contaminated liquids enter the potable water supply by siphonage.
  • Backpressure is a condition where the pressure downstream becomes greater than the pressure upstream of the cross connection thus allowing water or other contaminated liquids to enter the potable supply.