Pipes making a humming or vibrating noise
Check the steps below first — if you're not confident, get it fixed safely today.
Post a job — we'll find you an engineer →Hearing a persistent humming or vibrating sound coming from your pipes can be unsettling, but you're far from alone — it's one of the most common complaints plumbers receive, particularly in areas with mains supplies delivering higher pressure. The good news is that this noise is almost never a sign of catastrophic failure; it's usually your system telling you that water pressure is too high, or a valve somewhere needs attention. High-pressure humming is especially common in properties fed directly from the mains without a pressure-reducing valve, and it can actually put unnecessary strain on your pipework and appliances over time. This guide walks through the most likely culprits — from mains pressure issues to failing valves — and shows how to identify and fix the problem yourself, or know when it's time to call in a qualified plumber.
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Most likely cause & what to check
A continuous humming from pipework is usually caused by one of three things: high mains water pressure causing the pipes to resonate, a worn or loose washer in a tap or valve, or a pump that is running but partially blocked.
First, identify when the humming occurs — only when water is flowing? All the time? Only when the heating is on? This will narrow down the cause significantly.
If it hums when running taps: check each tap in the house individually. A worn tap washer can vibrate at certain flow rates causing a humming or groaning. Replacing the washer (pennies) often eliminates this. Quarter-turn taps with a faulty ceramic cartridge can do the same.
If it hums when the heating pump runs: the pump may be running at too high a speed setting. Many pumps have a three-speed selector — try setting it to speed 1 or 2 (lower) and see if the noise reduces. A pump that is noisy even at low speed may need replacing (£60–£150 for the pump, plus labour).
If it hums constantly regardless of what is running: this suggests high mains pressure resonating through the service pipe. A pressure gauge on the mains stopcock will confirm — anything above 4 bar is excessive. A plumber can fit a pressure-reducing valve (PRV) on the incoming main.
Also check that all supply pipes are properly clipped — pipes that are free to vibrate will amplify any resonance. Adding foam pipe lagging and additional clips in accessible locations (under kitchen sink, in airing cupboard) can help damp the vibration.
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Frequently asked questions
Is humming pipes dangerous, or will they burst?
Humming pipes themselves aren't immediately dangerous, but persistently high pressure does put stress on fittings and seals over time, which can eventually lead to leaks. It's worth addressing sooner rather than later to protect your system, but there's no need to panic — fit a pressure-reducing valve and the problem is solved.
Why do my pipes only hum when I run the hot tap?
If humming occurs only with hot water, the issue is likely in your heating system — check your boiler's system pressure gauge (it should read 1–1.5 bar when cold) and listen for grinding sounds from the heating pump, which may indicate a failing pump. You may also have a faulty valve on your hot water cylinder or in your boiler circuit.
Can I fit a pressure-reducing valve myself?
Whilst some confident DIYers do attempt this, a PRV must be installed correctly at the mains stop tap to work properly, and fitting one incorrectly could affect water supply to the entire property. It's best to have a qualified plumber handle the installation — it only takes an hour or two and costs around £100–200.
How do I know if my water pressure is actually too high?
You can buy or borrow a simple pressure gauge from any plumber's merchant and attach it to an outside tap — take a reading at the stop tap (usually in your kitchen cupboard or outside). Anything consistently above 3 bar is considered high and should be reduced to around 2–2.5 bar using a PRV.
The humming is coming from my toilet cistern — what's wrong?
Older ball valves vibrate and hum as the cistern fills, which is perfectly normal but annoying. A modern diaphragm-type valve is quieter and more reliable — a plumber can swap one in for you in minutes, or you can fit a replacement yourself if you're handy with basic plumbing.
If I fit a PRV, will it reduce water pressure everywhere in my home?
Yes — a PRV fitted at the mains stop tap regulates pressure for the entire property, which is exactly what you want if pressure is too high. You'll notice no loss of flow or performance; in fact, your taps and showers should feel more controlled and your water bill may even drop slightly.