Tap makes a whistling or squealing noise
⚠️ Turn off the water supply before dismantling the tap.
A whistling or squealing tap is one of those annoying household sounds that catches you off guard every time you turn on the water. The good news is that in most cases, it's nothing to worry about and usually signals a simple fix rather than a plumbing emergency. This noise typically comes from a worn rubber washer vibrating inside the tap as water passes through, though occasionally it points to higher water pressure or a damaged valve seat. It's a problem that affects plenty of UK homes, especially older properties with traditional tap designs, and it's very much a DIY-friendly repair if you're reasonably handy. This guide walks you through identifying the cause, carrying out the fix yourself, and knowing when the issue warrants calling in a Gas Safe registered engineer or qualified plumber.
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Most likely cause & what to check
Whistling when the tap is partially open is usually a worn or loose rubber washer vibrating against the seat.
Turn off the water supply, dismantle the tap headgear, and inspect the washer. Replace if it shows any wear, cracking, or distortion.
Apply a thin smear of silicone grease to the new washer before fitting.
If the noise persists after replacing the washer, the seat itself may be damaged — regrind or replace the headgear.
On a ceramic cartridge tap, the cartridge itself may need replacing — they are brand-specific but widely available online.
High pressure can also cause whistling — if the noise is throughout the house, ask your water supplier to check the incoming pressure.
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Frequently asked questions
Is a whistling tap dangerous?
No, a whistling tap isn't dangerous in itself. It's an annoying noise caused by vibration rather than a sign of a serious fault. However, the underlying wear that causes it should be addressed to prevent water waste or future problems.
Can I fix a squealing tap without turning off the water?
You can diagnose and listen to the noise without turning off the water, but you must turn off the supply before you dismantle the tap. This is a basic safety precaution to avoid water damage and injury.
How much does it cost to fix a whistling tap?
A DIY fix typically costs just a few pounds for a replacement washer and silicone grease from any plumber's merchant. If you call a plumber, expect a callout fee of £60–£150 depending on your region, though the actual repair is straightforward.
Why is only one tap whistling when others aren't?
If only one tap whistles, the problem is almost certainly a worn washer or damaged seat in that specific tap rather than a water pressure issue affecting the whole house. Each tap wears independently depending on use and water hardness in your area.
What's the difference between whistling and other tap noises?
Whistling is a high-pitched, continuous noise when the tap is partially open; it's distinct from banging (water hammer), groaning, or dripping. Whistling almost always points to a washer issue, while other noises may indicate different problems.
Will replacing the washer definitely stop the noise?
In about 90% of cases, yes—a new washer solves the problem straight away. If the noise persists, the valve seat underneath may be pitted or damaged and will need regrinding or the headgear replaced entirely.