How to Fix a Leaking Tap at Home Safely
A tap that drips once every few seconds may seem like a minor annoyance, but it can waste a surprising amount of water over time. Knowing how to fix leaking tap problems can save water and prevent a small fault becoming a more awkward plumbing repair. The key is to identify the type of tap, isolate the water properly and avoid forcing parts that are worn or seized.
For many homeowners, a leaking tap is a straightforward repair involving a washer, valve or cartridge. However, if the tap is corroded, the leak is coming from pipework beneath the sink, or isolation valves will not close, it is sensible to call a qualified plumber rather than risk water damage.
First, find where the tap is leaking
The location of the leak usually points to the part that needs attention. A drip from the spout when the tap is turned off normally means the internal seal is no longer closing against the valve seat. A leak around the handle or spindle often indicates a worn O-ring, packing seal or cartridge.
Water appearing at the base of the tap can be more difficult to diagnose. It may be a loose fixing nut, failed base seal, cracked tap body or a leak from the flexible connections underneath the sink. Dry the area thoroughly, then run the tap and check carefully with a torch. Do not assume water at the base automatically means the tap itself has failed.
If water is leaking from a pipe, valve or connection under pressure, turn off the local isolation valve if possible. If you cannot stop the flow, turn off the mains stop tap and arrange professional help promptly.
Identify the type of tap before starting
Most domestic taps fall into one of three common designs. Traditional pillar taps and some mixer taps use a rubber washer. Modern lever taps usually contain a ceramic cartridge, while quarter-turn taps may use a ceramic disc valve.
A washer tap often needs several turns to open or close. A ceramic disc tap generally opens within a quarter or half turn and has a smoother action. Lever mixers vary, but many use a cartridge that controls both temperature and flow.
This matters because fitting the wrong part will not cure the leak. Taking the old washer, valve or cartridge with you when buying a replacement can help, although tap manufacturers use many different sizes and splines. Where a replacement cannot be matched reliably, replacing the tap may be the better-value option.
What you will need to fix a leaking tap
Before taking anything apart, gather the right tools. A small adjustable spanner, flat-head and cross-head screwdrivers, an Allen key set, cloths, a plug and replacement parts are usually enough for a basic repair. A socket set can also be useful for some tap heads and back nuts.
Put the plug in the basin or sink before removing screws or small components. This simple step prevents a tiny grub screw or retaining nut disappearing down the waste. Wrap a cloth around chrome surfaces before using a spanner, as tools can easily scratch the finish.
Avoid using excessive force. Old taps can seize through limescale and corrosion, particularly in hard-water areas. Forcing a component may crack the tap body, twist pipework below the sink or turn a small repair into a replacement job.
How to fix a leaking tap with a worn washer
If you have a traditional compression tap that drips from the spout, the washer is the most likely cause. Start by turning off the water supply. Many taps have small isolation valves on the hot and cold pipes beneath the basin or sink. Turn the slot on each valve a quarter turn so it sits across the pipe. If there are no local valves, use the main stop tap, which is commonly located under the kitchen sink or near the water meter.
Open the tap after isolating the supply to release remaining water and confirm that the flow has stopped. This is worth checking twice. Never rely on a tap being turned off at the handle while you work on it.
Remove the decorative cap on top of the tap handle, if fitted. It may lift off with a flat screwdriver or be secured by a small screw. Undo the handle screw, lift away the handle and use a spanner to remove the tap headgear beneath it.
At the bottom of the headgear is a rubber washer held by a small screw or nut. Remove it, fit an identical replacement washer and reassemble the tap in reverse order. Take care not to cross-thread the headgear when refitting it.
Before turning the water fully back on, make sure the tap is in the closed position. Restore the supply slowly, then test the tap. If it still drips, the valve seat inside the tap body may be worn, pitted or damaged. A new washer will not seal properly against a damaged seat, and a plumber may need to reseat it or replace the tap.
Repairing a cartridge or ceramic disc tap
A modern mixer tap leaking from the spout is often caused by a worn cartridge or ceramic valve. The process begins in the same way: isolate the water, open the tap to release pressure and protect the plughole.
Look for a small screw beneath the handle, behind a cover or on the side of the lever. This may require an Allen key rather than a screwdriver. Once the handle is removed, there is often a decorative shroud followed by a retaining nut or clip that holds the cartridge in place.
Remove the cartridge carefully and inspect it for visible damage, limescale or worn seals. Cartridges need to be matched precisely, including their height, diameter, locating pins and spline arrangement. If you are unsure, do not refit a near match. It may leak, make the handle difficult to operate or fail to control hot and cold water correctly.
Clean light limescale from the housing with a cloth before fitting the new part, but do not use harsh chemicals on seals. Reassemble the tap and test it slowly. Check both the spout and the area around the handle for leaks.
A leak from the handle or base needs a different approach
When water seeps around a tap handle, the fault may be an O-ring or seal around the spindle rather than the washer or cartridge itself. On some taps, this seal can be replaced once the headgear is removed. On others, particularly modern mixers, replacing the full cartridge is more practical.
A leak at the base of a mixer tap may require tightening the fixing arrangement below the sink. Access can be restricted, and the retaining nut is often in an awkward position behind pipework. Check first that the water is not actually running down from the handle or from a loose flexi-hose connection.
Do not overtighten flexible tap connectors. If a connection is leaking, it may need a new washer or seal, or the hose itself may be damaged. A connection that looks dry can still leak only when the tap is running, so test it with kitchen roll held around the joint rather than relying on a quick visual check.
When a DIY tap repair is not the right choice
A small internal tap repair is reasonable for a confident homeowner, but there are clear occasions to stop. Call a plumber if the stop tap or isolation valve will not work, the tap body is cracked, pipework moves when you undo a fitting, or you cannot identify the correct replacement part.
It is also best to arrange help where the leak has affected cupboards, flooring or electrical items. Water can travel behind units and under flooring before it becomes visible. Landlords should deal with leaks promptly too, as ongoing water damage can affect the condition and safety of the property.
A qualified local plumber can diagnose whether the problem is the tap, its connections or a pressure-related issue elsewhere in the system. In some cases, replacing an old, heavily scaled tap is more reliable and cost-effective than repeatedly changing internal parts. AquaHeat Heating Services can assist homeowners and landlords across Warrington with tap repairs, replacements and wider domestic plumbing faults.
Preventing the next dripping tap
Taps usually fail gradually through normal use, hard-water scale or worn seals. Do not force a tap handle tightly closed to stop a drip, as this can damage the washer or ceramic mechanism further. If a tap becomes stiff, starts to squeak or needs extra pressure to turn off, deal with it before the leak becomes constant.
Check beneath sinks periodically for damp patches, staining or swollen cupboard bases, especially around older taps and flexible hoses. Early attention is generally quicker, cleaner and less expensive than repairing damage after a slow leak has gone unnoticed.
If you have isolated the supply, changed the correct part and tested every joint carefully, you should be able to enjoy a quiet, drip-free tap again. If anything does not look right, leave the water isolated and get a reliable plumber to put it right safely.
