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A dripping tap is usually caused by worn washers, damaged cartridges, loose parts, or high water pressure. While it may seem like a minor issue, a leaking tap can waste thousands of litres of water each year and increase your water bill. Most dripping taps can be repaired by replacing internal components, but persistent leaks may require a professional plumber to diagnose the root cause and prevent further damage.

Why Is My Tap Dripping?

A dripping tap is one of the most common plumbing problems in homes and businesses. That constant drip isn’t just annoying — it can waste water, increase your bills, and sometimes indicate a bigger plumbing issue.

The good news? Most dripping taps have a clear cause and can be fixed quickly once the issue is identified.

The Most Common Causes of a Dripping Tap

1. Worn-Out Washer

This is the number one cause of a dripping tap, especially in older taps.
Every time you turn the tap on and off, the washer presses against the valve seat. Over time, this friction causes wear and tear, leading to leaks.

Signs:

  • Dripping from the spout
  • Leak stops when tap is tightened more
  • Older style taps (compression taps)

2. Faulty Tap Cartridge

Modern mixer taps use cartridges instead of washers. If the cartridge becomes damaged or worn, the tap will start dripping even when fully turned off.

Signs:

  • Dripping mixer tap
  • Leak continues even when tightly closed
  • Stiff or loose handle

3. High Water Pressure

If your home has high water pressure, it can force water through the tap even when it’s off, causing a constant drip.

Signs:

  • Dripping mainly at night
  • Multiple taps affected
  • Loud pipes or banging noises

4. Damaged Valve Seat

The valve seat connects the tap to the spout. Over time, limescale and corrosion can damage it, preventing a proper seal.

Signs:

  • Persistent leak despite washer replacement
  • Rust or scale inside tap
  • Older plumbing systems

5. Loose or Worn O-Ring

A worn O-ring often causes leaks around the base of the tap handle rather than the spout.

Signs:

  • Water leaking from handle area
  • Handles feel loose
  • Visible water around fittings

Is a Dripping Tap Serious?

Many people ignore a dripping tap, but it can cause bigger issues if left untreated.

A single dripping tap can:

  • Waste over 5,000 litres of water per year
  • Increase your water bill
  • Cause limescale build-up
  • Lead to further internal tap damage

Fixing it early saves money and prevents costly repairs later.

Can I Fix a Dripping Tap Myself?

In some cases, yes. If you’re confident with basic DIY, you may be able to:

  • Replace a washer
  • Change a tap cartridge
  • Tighten loose fittings

However, incorrect repairs can cause:

  • More leaks
  • Water damage
  • Broken tap components

If you’re unsure, it’s always safer to call a professional plumber.

When Should You Call a Plumber?

You should contact a plumber if:

  • The tap keeps dripping after replacing parts
  • You can’t identify the tap type
  • The tap is leaking from multiple areas
  • There is low water pressure with the drip
  • The tap is old or seized

A qualified plumber can quickly diagnose the issue and repair or replace the tap properly.

How Much Water Does a Dripping Tap Waste?

Many homeowners are surprised by this:

  • 1 drip per second = Over 3,000 litres per year
  • Faster drip = Even higher water waste
  • Higher water bills over time

That small drip can cost more than a repair in the long run.

How to Prevent Taps From Dripping in the Future

Regular maintenance helps avoid leaks:

  • Don’t overtighten taps
  • Fix small leaks early
  • Install a pressure regulator if needed
  • Replace worn parts before failure
  • Schedule routine plumbing checks

FAQs About Dripping Taps

Why is my tap dripping even when turned off tightly?

This usually means the internal washer or cartridge is worn and no longer sealing properly.

Is a dripping tap an emergency?

Not usually, but it should be fixed quickly to prevent water waste and further damage.

Why does my mixer tap keep dripping?

Mixer taps commonly drip due to a faulty cartridge or high water pressure.

Can high water pressure cause a dripping tap?

Yes, excessive pressure can force water through the tap even when it’s off.

Should I repair or replace a dripping tap?

If the tap is relatively new, repair is usually cheaper. Older or heavily worn taps may be more cost-effective to replace.

How long does it take a plumber to fix a dripping tap?

Most dripping tap repairs can be completed within 30–60 minutes depending on the issue.

Need Help With a Dripping Tap?

If your tap won’t stop dripping, professional repair can save you time, water, and money. A quick fix now can prevent bigger plumbing problems later.

Contact a local qualified plumber to diagnose and repair the issue properly and ensure your plumbing system is working efficiently.