Frequently Asked Questions about Water Pressure

The water pressure inside a residential property should never exceed 500 kilopascals, or the equivalent of 72 PSI.

If the pressure does exceed 500 kPa, a pressure limiting valve must be installed to meet Australian standards and regulations.

However, many houses do exceed the limit as many old homes were never initially tested. For some household appliances, this could void warranties.

High water pressure certainly can damage your pipes and plumbing fixtures. One of the most common problems is water hammer.

It’s when a tap or valve is suddenly closed and hydraulic shock waves reverberate throughout your pipes. Essentially, when you suddenly turn off the tap the sudden jolt is like a bull running into a door.

You’ll hear loud banging and vibrating, and if left alone you may be faced with burst pipes, leaking pipes and leaking taps.

If your water pressure exceeds 500 kPa you run the risk of damaged fixtures or burst pipes. Australian Standards require new homes and extensions to install pressure limiting valves to avoid high water pressure.

Low water pressure will reveal itself through leaking taps and showerheads, plus slow fill times for your washing machine and dishwasher. Low pressure – or no water pressure – can be a major inconvenience in your home.

Leaking pipes or blocked pipes are often to blame This is because the water is being diverted through any cracks or holes in the pipes. By the time it reaches the faucet, you have lost much of the initial pressure.

Any signs of low water pressure should be investigated by a licensed plumber promptly as it could be causing invisible damage.

If you have a water pressure regulator, or pressure limiting valve, it is typically located where the main water line comes into the house, just after the main shut off valve.

Your PLV can also be installed alongside the hot water inlet, or in any easily accessible location.

The pascal (Pa) or kilopascal (kPa) as a unit of pressure measurement is used around the world, particularly in countries which follow the metric system. One kPa is equal to 0.145038 psi (pounds per square inch).