How to Check Your Home's Water Pressure (And What's Normal)

Updated July 2026 · 6 min read · Geelong Emergency Plumbing

Water pressure is one of those specifications most homeowners discover only when something goes wrong — either a trickle that won't rinse the shampoo, or a hammer bang whenever the washing machine stops filling. Checking it takes two minutes and a $20 gauge. Here's how to do it, what the reading means, and what to do if it's outside the acceptable range.

What Normal Water Pressure Is in Australia

Australian plumbing standards (AS/NZS 3500) specify that water supply pressure at a dwelling should typically be between 200 and 500 kPa (kilopascals). Many water authorities, including Barwon Water in the Geelong region, aim to deliver 350–500 kPa at the property boundary. Pressure within the house will be slightly lower than at the meter due to pipe friction over distance.

In practice: below 200 kPa feels noticeably weak at taps and showers; above 500 kPa creates noise (water hammer), accelerates wear on fittings, washer and flexi hoses, and increases the risk of the kind of sudden failures described in our flexi hose guide. Some properties, particularly those at the bottom of hilly areas or near main water infrastructure, can see static pressures of 600–800 kPa — high enough to warrant a pressure-limiting valve.

How to Check Water Pressure (Two Methods)

Method 1: Pressure gauge (accurate)

Buy a pressure gauge with a standard hose-thread fitting from any hardware or plumbing supply store — typically $20–$40. Screw it onto an outdoor garden tap (the one closest to the meter gives the best reading of incoming supply pressure). Turn the tap on fully and read the dial. That's your static supply pressure. Check it with every other water outlet in the house turned off for a true static reading, and again with a couple of taps running for a sense of dynamic pressure under demand.

Method 2: Flow rate bucket test (indicative)

Fill a 10-litre bucket from a tap in full open position and time how long it takes. Under 30 seconds = adequate flow; over 60 seconds suggests genuinely low pressure or a restriction somewhere in the line. This doesn't give a kPa reading but it identifies whether low pressure is the problem quickly, for free.

Signs of High Water Pressure

• Water hammer (banging pipes) when taps or appliances close — see our water hammer guide
• Taps that spray rather than stream at normal settings
• Flexi hoses that need replacing more frequently than expected
• Hot water system TPR valve dripping frequently (pressure triggers the relief valve)
• A reading above 500 kPa on the gauge

Signs of Low Water Pressure

• Weak flow at showers and taps throughout the house (not just one fixture)
• Hot water taking a long time to arrive at the tap
• Appliances (dishwasher, washing machine) running slowly or generating low-water error codes
• Reduced flow in upper floors compared to ground floor

The Fixes

High pressure (above 500 kPa): a pressure-limiting valve (PLV) on the incoming supply, set to 350–450 kPa, is the definitive fix. Installed by a licensed plumber, typically $400–$900. Extends the life of every fitting, flexi hose and appliance in the house, and solves water hammer in most cases. Required by AS/NZS 3500 where incoming pressure exceeds 500 kPa.

Low pressure (below 200 kPa): first check the meter stop valve is fully open, then check for a partially closed isolation valve. If the meter shows adequate pressure but fixtures don't, the restriction is inside the property — scale in pipes, a failed PRV set too low, or a partially blocked filter. If the meter itself shows low pressure, report to Barwon Water (Geelong region) — supply pressure at the meter is their responsibility. A pressure-boosting pump is the engineering solution for genuinely low supply areas, installed by a licensed plumber.

A note on the Geelong supply context: Barwon Water services Greater Geelong and the Bellarine, and the region includes both high-pressure zones (properties near mains infrastructure) and lower-pressure zones (elevated areas and outer-suburban extensions). If your gauge reads below 200 kPa with all valves confirmed open, call Barwon Water with the specific reading and time — a specific number is a more actionable complaint than a general low-pressure report, and they can check whether the issue is on their side of the meter.

If you test your pressure and find it sits between 400 and 500 kPa — technically acceptable but on the high side — it is worth considering a pressure-limiting valve proactively rather than waiting for water hammer to start or a flexi hose to fail. The PLV costs $400–$900 installed and immediately reduces wear on every fitting, washer and appliance in the house. It also reduces the intensity of thermal expansion pressure in the hot water system, which extends the life of the TPR valve and reduces the tank stress that shortens cylinder life. Proactive PLV installation is one of the few plumbing upgrades that pays for itself in extended component lifespans rather than a direct energy saving, which makes the maths slower but equally real.

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Related guides: Water hammer fix · Flexi hose burst risk · How to fix a leaking tap