How to fix a dripping tap

By DIY Plumbing Guide Editorial Team · Published 20 October 2026

Identify your tap type, isolate the water, and replace the washer or ceramic cartridge step by step, with the tools you need and when to call a plumber.

A dripping tap wastes water and, if it is the hot tap, energy too. Most drips are caused by a worn washer or a faulty ceramic cartridge, and both are usually straightforward to replace with basic tools. This guide shows you how to identify your tap, fix it safely, and know when to call a professional.

First, identify your tap type

Traditional compression taps: the handle turns several times from off to fully on, and you feel it tighten as it closes. These use a rubber washer that wears over time.
Quarter-turn or half-turn taps: the handle turns only a quarter or half a turn. These usually use a ceramic disc cartridge.
Mixer taps: one spout with hot and cold controls, either two handles (each with its own washer or cartridge) or a single lever with one cartridge.

If water drips from the spout, the washer or cartridge is the likely cause. If it leaks around the handle or base, an O-ring or seal is more likely.

Tools and parts

adjustable spanner, screwdrivers and an Allen key set;
replacement washer or cartridge (take the old one to a plumbers' merchant to match it);
a cloth to protect the tap's finish, and a plug to cover the plughole so small parts cannot fall in;
silicone grease (tap grease) for O-rings.

Step 1: Turn off the water

Look for an isolating valve on the pipe under the sink: a small valve with a slot you turn a quarter turn with a screwdriver, so the slot is across the pipe. If there is none, turn off the main stopcock for cold water. For hot water from a tank, you may need to turn off the valve on the cold feed to the cylinder. Then open the tap to drain remaining water.

Step 2 (compression tap): replace the washer

Prise off the decorative cap on the handle and undo the screw underneath. Remove the handle.
Unscrew the headgear (the large nut below the handle) with a spanner, holding the tap body steady so you don't twist the pipework. Use a cloth to protect the finish.
The washer is at the bottom of the headgear, held by a small nut or pushed on. Remove it.
Fit the new washer of the same size, reassemble and tighten firmly but not excessively.

Step 2 (ceramic tap): replace the cartridge

Remove the handle as above (some lever handles have a small grub screw underneath, needing an Allen key).
Unscrew the cartridge with a spanner. Note which way it faces: hot and cold cartridges on two-handle taps may turn in opposite directions.
Take it to a plumbers' merchant to match. Cartridges are often specific to a brand.
Fit the new cartridge and reassemble.

Step 3: Restore the water and test

Turn the isolating valve back on slowly, open the tap to clear air, then check for drips. If it still drips, the valve seat (the part the washer presses on) may be worn. A plumber can regrind it, or replacing the tap may be more sensible.

Leaks from the handle or base

Replace the O-rings on the spindle or the spout base, applying a little silicone grease. On mixer taps with swivel spouts, worn O-rings at the spout base are a common cause.

When to call a plumber?

You cannot isolate the water, or the stopcock will not turn.
Parts are seized or corroded and could break pipework.
The tap is old and worn, and replacing it would be better value.

Replacement taps and fittings should be suitable for UK water supply, for example approved under a recognised water fittings approval scheme, to comply with the Water Fittings Regulations.

Frequently asked questions

How much water does a dripping tap waste?

It depends on the rate, but a steady drip can waste a large amount over a year. If you are on a water meter, it also costs money.

Can I fix a tap without turning off the water?

No. Always isolate the supply first.

Sources and further reading

Facts checked on 20 October 2026. Spotted an error? Tell us and we will correct it.