This is an expanding area of specialist plumbing which is being implemented by Water Corporation.

It involves installing a non-return device at the water meter, preventing any contaminated water from within the property (usually a commercial property) entering Water Corp's mains. This is called a containment device.

There is also requirement for zone devices within the property's water service, and individual devices on machinery or potential hazards on the property.

All situations need to be individually assessed.