Fix Leaking Tap: 5 Causes and Quick Fixes

Fix Leaking Tap: 5 Causes and Quick Fixes

That slow, steady drip at 3am isn’t just maddening — it’s silently inflating your water bill, wasting thousands of litres a year, and quietly damaging your fittings. The good news? Learning to fix leaking tap problems yourself takes about 20 minutes and a handful of basic tools.

In this guide we’ll cover the five most common reasons taps drip, exactly how to fix leaking tap issues at home for each cause, and when it makes more sense to call in a professional. Whether you’ve got a traditional compression tap, a sleek mixer, or a modern monobloc, the steps to fix leaking tap drips below will get you sorted without a callout fee.

Before we get into the causes, a quick word of reassurance: you don’t need to be a tradesperson to fix leaking tap problems at home. Most of these jobs are mechanical, predictable, and very forgiving as long as you turn the water off first and work methodically.

Why You Should Fix a Dripping Tap Today

A single dripping tap can waste over 5,500 litres of water per year — enough to fill more than 70 bathtubs. According to Waterwise, the UK’s leading independent authority on water efficiency, household leaks are among the largest sources of avoidable water waste in Britain. The longer you wait to fix leaking tap drips, the more this small annoyance compounds into:

• Higher bills, especially if you’re on a water meter
• Stubborn limescale and mineral staining around the basin
• Corroded fittings that turn a £2 washer job into a £200 replacement
• Damp damage to cabinets, flooring and joinery

The sooner you act, the simpler the repair. Let’s walk through the five most common reasons taps drip and how to fix leaking tap problems in each scenario.

5 Causes of Leaking Taps

1. A Worn-Out Washer

The single most common reason you need to fix leaking tap drips is a tired rubber washer. This mostly affects traditional compression taps — the ones with separate hot and cold handles you twist firmly to close.

Over years of being squashed against the valve seat hundreds of times a day, the washer hardens, cracks, or flattens out. The result is a steady drip from the spout that no amount of handle-tightening will stop.

How to fix:

1. Turn off the water at the isolation valve under the basin (or at the mains if there isn’t one).
2. Open the tap to drain any residual water.
3. Prise off the decorative cap on the handle and unscrew it.
4. Use a spanner to remove the headgear nut.
5. Pull out the valve assembly and swap the old washer for a new one of identical size.
6. Reassemble in reverse, turn the water back on, and test.

A pack of mixed washers costs under £3 from any hardware shop. This is by far the cheapest way to fix leaking tap problems on older British taps.

2. A Damaged O-Ring

To fix leaking tap drips that appear at the base of the spout — rather than from the spout opening itself — you’re almost certainly looking at a worn O-ring. This is especially common on mixer taps with a swivel spout, where constant rotation slowly wears the rubber seal.

How to fix:

1. Isolate the water supply.
2. Loosen the grub screw at the base of the spout (usually requires an Allen key).
3. Lift the spout off and slide the old O-ring free.
4. Take it with you to the shop to match the exact size — even 1mm makes a difference.
5. Smear a tiny amount of silicone tap grease on the new ring before fitting.

Replacing an O-ring is one of the fastest ways to fix leaking tap drips at the base — typically a ten-minute job once you’ve got the part in hand.

3. A Faulty Cartridge

Modern monobloc and lever-style mixer taps don’t use washers — they use a ceramic disc cartridge. When these fail, you’ll see drips from the spout even with the lever fully closed, or you’ll notice the handle becoming stiff or scratchy to turn. To fix leaking tap drips on this type of tap, the whole cartridge needs replacing.

You can’t really repair a cartridge; you replace the whole unit. The challenge is matching the exact make and model, because cartridges aren’t standardised. Take a clear photo of your tap (and ideally a note of the brand) before heading to the merchant.

How to fix:

1. Shut off the water and open the tap to release pressure.
2. Remove the lever handle (look for a small grub screw or push-in cap).
3. Unscrew the retaining nut or collar and lift the old cartridge out.
4. Drop in the replacement, making sure the orientation matches.
5. Reassemble and test for smooth operation.

If your tap is more than ten years old, a replacement cartridge may not exist and a new tap could be the better call.

4. A Corroded Valve Seat

Sometimes the washer is fine but the surface it seals against — the valve seat inside the tap body — has corroded, pitted, or built up with limescale. Water still escapes because the seal can’t form properly, and a fresh washer alone won’t fix leaking tap drips in this scenario.

How to fix:

1. Remove the headgear as you would for a washer change.
2. Inspect the valve seat with a torch. Look for greenish corrosion or rough patches.
3. A valve seat reseating tool (about £15) will grind the seat smooth again.
4. Alternatively, fit a domed washer that can compensate for minor pitting.
5. Reassemble and test.

In hard-water regions like much of the South East, valve seat corrosion is a frequent reason homeowners struggle to fix leaking tap problems with just a new washer.

5. Loose Parts or High Water Pressure

The fifth common reason you might need to fix leaking tap drips is the simplest: something has worked loose, or your mains pressure is forcing water through seals that would otherwise hold. Vibration from daily use slowly loosens packing nuts, gland nuts and spout collars.

How to fix:

• Gently tighten any visible nuts at the base of the handle and around the spout — finger-tight, then a quarter turn with a spanner. Don’t overdo it; cracked chrome is expensive.
• If you’ve recently had work done on your supply, check the mains pressure with a gauge (under £15 online). Anything over 5 bar can blow seals, and you may need a pressure-reducing valve fitted to fix leaking tap issues caused by high-pressure water.

A Quick-Fix Checklist Before You Start

Before you take anything apart, run through this short list to fix leaking tap problems efficiently and avoid making things worse:

• Identify the tap type — compression, mixer, monobloc, or pillar.
• Locate your isolation valve before turning anything.
• Lay a towel in the basin to catch dropped screws and protect the chrome.
• Take photos at every stage of disassembly.
• Keep parts in order on a tray — gravity has a way of losing the small ones.
• Don’t force anything. If a nut won’t budge, a dab of penetrating oil and ten minutes’ patience beats stripped threads every time.

With the right diagnosis, most attempts to fix leaking tap drips take 15-30 minutes and cost less than a takeaway.

When to Call a Professional

DIY can fix leaking tap issues in the majority of cases, but there are times when calling a pro is the smarter move:

• Seized or corroded fittings that simply won’t come apart
• Leaks beneath the basin or coming from the pipework, not the tap itself
• Older taps where parts are no longer available
• Any sign of damp damage or water tracking under floorboards
• Recurring drips that come back within weeks of a DIY repair

If you’d rather hand it to someone who does this every day, our tap repair and replacement service covers everything from a single washer swap to a full mixer replacement, with parts carried in the van for same-day fixes.

Need Help to Fix Leaking Tap Problems in Essex?

If you’re anywhere across Essex — from Chelmsford and Colchester to Brentwood, Basildon and Southend-on-Sea — and would rather not spend your Saturday under the kitchen sink, we can help. Our local plumbers handle calls to fix leaking tap problems every week and carry the most common washers, O-rings and cartridges as standard, so most jobs are sorted on the first visit.

Whether it’s a slow drip you’ve been putting off or a sudden gush that’s just appeared, get in touch with Braiden Plumbing for a friendly, no-obligation quote and we’ll have the drip stopped before it costs you any more.