Backflow Contractors licence number BF 5165

Niche Plumbing and gas are committed to keeping all our drinking water safe and clean from any contaminants. It is a legal requirement that all backflow devices should be tested annually. It is ALSO a condition that this is done annually for you to be connected to the water supply?

We service, repair and install protection devices such as RPZD (Reduced Pressure Zone Device) Double check valves, single check valves and dual check valves.

We have all the necessary test equipment to test and certify the RPZD and DCV (Double Check Valve) which is valid for 12 months.

Backflow is the unintended flow of water or other liquids from a potentially polluted source into the drinking water supply.

WHERE CAN IT HAPPEN?

ANYWHERE drinking water is used!

HOW DOES IT HAPPEN?

BACK SIPHONAGE

Back siphonage is when the water flows backwards due to a sudden pressure drop.

BACKPRESSURE

Backpressure occurs when the outlet (downstream) pressure is greater than the supply pressure.

CROSS-CONNECTION

Cross connections are direct or indirect physical connections of drinking and non-drinking water. Any liquid has the potential to flow backwards given the right conditions.

HOW SERIOUS IS IT?

At worst, backflow can cause death. Any property that has drinking water entering it is classified with a degree of seriousness of the backflow contamination risk known as the HAZARD RATING.

LOW HAZARD - is any condition in the water supply which can be a NUISANCE.
MEDIUM HAZARD - is any condition in the water supply which can ENDANGER HEALTH.
HIGH HAZARD - is any condition in the water supply which can cause DEATH.

SELECTION OF BACKFLOW & PREVENTION DEVICES

First it is necessary to identify the hazards within the property. Upstream from these hazards, the water is considered as non-drinking until a suitable backflow prevention device is installed. It may be necessary to install a backflow prevention device for a fixture, a zone within a building, or at the boundary of the property.

LEVELS OF PROTECTION INDIVIDUAL PROTECTION

Backflow prevention protection provided at individual fixtures.

ZONE PROTECTION

Backflow prevention protection provided at the connection to specific sections of the water supply system within a building.

CONTAINMENT PROTECTION

Backflow prevention protection provided at the property boundary to protect the authority's water supply from contamination.