Pipes vibrating or humming when taps are turned on
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Most likely cause & what to check
Pipe vibration when taps are run is usually caused by high mains water pressure, a worn tap washer or cartridge, or a partially closed valve causing turbulent flow.
First, check each tap in the house — the noise often originates from one specific tap with a worn washer. Operate each tap individually and identify which one causes the vibration. Replace the washer or cartridge in that tap.
Check any partially closed isolation valves or stopcock — a valve that is almost (but not fully) closed causes turbulent water flow which vibrates the pipe. Fully open all valves that are not intentionally restricting flow.
UK mains water pressure can reach 3 bar or more in some areas. Check your mains pressure (a gauge can be temporarily fitted to an outside tap). If above 3 bar, a pressure reducing valve (PRV) fitted to the mains incoming pipe will resolve vibration and protect appliances — cost £40–£100 for the valve, plus plumber labour.
If the vibration only occurs from one outlet and tap replacement does not fix it, a local pipe constraint may need releasing by a plumber.
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