Backflow prevention


What is a backflow prevention device?

A backflow prevention device is a valve that prevents potentially harmful polluted water from entering the city’s drinking water supply when an incident such as a drop in pressure causes water to be drawn back into the main from private properties.

When is a backflow prevention device required?

You may have a backflow prevention device on your property if you have any of the following:

  • an irrigation system
  • fire hose reels or hydrants
  • vehicle or bin wash down bays
  • A commercial or industrial activity or machinery connected to the mains
  • Water outlets in proximity to pollutants, grease traps or chemicals

What causes backflow to occur?

A backflow of water can occur when there is a change of water pressure due to events such as a burst water main or firefighting operations causing the water to flow backwards from a private property into the main water supply.