How a backflow prevention device works

A backflow incident can cause health concerns for people using your water. A backflow prevention containment device ensures that when there is a cross connection the drinking water supply cannot be contaminated. There are different types of devices which can be installed depending on the hazard rating of the property. The three hazard ratings identified AS/NZS 3500:1 Section 4 are:

• high hazard - any condition, device or practice which in connection with the water supply system has the potential to cause death
• medium hazard - any condition, device or practice which in connection with the water supply could endanger health
• low hazard - any condition, device or practice which in connection with the water supply system would constitute a nuisance but not endanger health.