Backflow prevention

The Waimakariri District Council adopted a Backflow Prevention Policy in 2014.

This policy sets out the backflow prevention requirements for new and existing properties in the district. View the Backflow Prevention Policy (pdf, 163.4 KB)

Backflow is the unplanned reversal of liquid/contamination from your property into the Council's potable water supply system.

The policy could affect your business or property, depending on the types of activities that are undertaken. Examples of activities which may require backflow prevention are:

  • you use water for washing equipment that has been exposed to chemicals
  • you mix water with other substances on your property
  • you have a secondary water supply on your property.

If any of these circumstances apply, the Council may require backflow prevention devices to be installed at your property boundary. If a backflow surveyor finds there is a backflow hazard from activities on your property then a backflow prevention device would be required at your boundary to protect the public water supply.

A survey of backflow hazards is proposed to begin in July 2014. This would begin within the district's industrial areas (Business 2 Zones).

Some examples of potential backflow hazards on your property could be:

  • washing contaminated equipment, vehicles or machinery
  • operating appliances that require a high water pressure
  • cross connection of your private water supply (e.g. well/tank) to pipes that are also connected to the public supply.

The following appendices provide further information on the types of activities that may require backflow prevention devices at the property boundary: