Low or high water pressure: causes and fixes
Weak showers, banging pipes and a dripping relief valve all trace back to pressure. How to tell if it's your pipes or the supply, and what fixes each.
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Key takeaways
- Sydney Water's Operating Licence requires a minimum water pressure of 15 metres head at the point of connection, usually the mains tap.
- A simple check: with everything else off, run the front garden tap fully for one minute and read the meter. 18 litres or more means at least 15 metres head.
- Low pressure at only some taps points to your own plumbing, often blocked tap filters, a failing valve or old pipes.
- High pressure is hard on everything it feeds. Banging pipes, a dripping relief valve and burst hoses are the signs, and a pressure reduction valve is the usual fix.
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