Only in a limited way. You can measure the pressure and make simple checks, but do not adjust a pressure-reducing valve (PRV), dismantle pressurised fittings or interfere with the water meter or mains equipment. A licensed plumber should diagnose persistent high or low pressure before making adjustments.
Safe checks you can make
Use a suitable water pressure gauge on a compatible outdoor tap, following the gauge manufacturer’s instructions.
- Turn off taps and water-using appliances to obtain a static-pressure reading.
- Fit the gauge without using improvised adaptors, damaged threads or excessive force.
- Open the tap as directed, record the reading, then close it.
- Repeat the test under the same no-flow conditions, preferably at different times. Mains conditions and local demand can affect results.
- Compare outlets. If only one tap or shower has weak flow, the problem is more likely local than property-wide.
- Check whether a readily accessible fixture isolation valve is fully open. Do not force a seized valve or dismantle anything.
A gauge reading is evidence, not a complete diagnosis. Record the location, time and whether the problem affects one outlet or the whole property. These observations help distinguish a local restriction from broader household low pressure.
Stop if the test connection leaks. Close the tap if safe and do not force or overtighten the fitting.
When to call a licensed plumber
Arrange an assessment if pressure is persistently high or low throughout the property, changes suddenly, or occurs with leaks, banging pipes or appliance faults.
Adjusting a PRV may not increase or reduce water pressure correctly. Learn the signs of a faulty pressure regulator rather than assuming adjustment will solve the problem. The cause could instead be a restriction, leak, partially closed isolation valve, supply condition or unsuitable pipework. Excessive pressure can also stress valves, flexible hoses, appliances and pipes.
Do not open, bypass or alter a PRV, backflow device, water meter or other mains-supply equipment. You cannot install a pressure-reducing valve yourself in NSW, and the same licensed-work boundary applies to replacement or alteration.
If an active leak is causing damage, use the property’s normal isolation valve only if you know where it is and can operate it safely. Do not force it. Contact our licensed plumbing team to test the system and determine whether adjustment or repair is required.