How to Fix a Leaking Tap (And What Causes It)

That constant drip… drip… drip.
It’s not just annoying. It wastes water, increases your bill, and over time can damage your tap seat or fittings.

The good news? Most leaking taps are caused by worn internal parts and can often be fixed in under an hour.

Let’s break down what causes a leaking tap, how to fix it properly, and when it’s time to call a licensed plumber.

What Causes a Leaking Tap?

Taps rely on internal components to create a watertight seal when turned off. When one of those components wears out, water slips through, and you get that steady drip.

In Australian homes, especially older properties around Newcastle and Canberra, we commonly see wear from:

  • Age and constant use
  • High water pressure
  • Overtightening taps
  • Mineral build-up

Most traditional taps use rubber washers. Modern mixer taps usually use ceramic cartridges.

Knowing which type you have makes all the difference.

The 3 Most Common Parts That Cause a Leaking Tap

1. Washer

The rubber washer compresses against the seat to stop water flow. Over time, it flattens or cracks.

2. O-Ring

This small rubber ring prevents water leaking from around the spindle.

3. Jumper Valve

This sits inside the spindle assembly and helps apply pressure to the washer.

If any of these fail, the tap drips.

Parts of the Tap

Washer Tap vs Ceramic Tap - What’s the Difference?

Washer Tap:

  • Turns multiple rotations
  • Uses rubber washer
  • Cheaper parts
  • More prone to dripping over time

Ceramic Tap:

  • Turns quarter or half turn
  • Uses ceramic cartridge
  • Longer lifespan
  • Cartridge can be brand-specific

If your tap turns only a quarter or half turn, it likely has a ceramic cartridge.

How to Fix a Leaking Tap (Step-by-Step)

Estimated Time: 30-60 minutes
DIY Cost: $10-$40 for parts
Plumber Cost: Typically $150-$300 depending on location and complexity

Step 1 – Turn Off the Water

Shut off your mains water supply. In houses, it’s usually at the front yard meter. In apartments, look for an isolation valve under the sink.

Open the tap to release remaining pressure.

Step 2 – Disassemble the Tap

Remove the cap (“H” or “C”).
Unscrew the handle.
Remove the flange and bonnet.
Use a spanner to remove the spindle assembly.

You should now see the washer, O-ring and jumper valve.

Step 3 – Replace the Worn Parts

Even if only one part looks worn, it’s best practice to replace them all while it’s apart. The parts are inexpensive, and it prevents future call-backs.

If you’re unsure which washer fits, take the old parts to your local hardware store for matching.

For ceramic mixer taps, you may need to replace the entire cartridge, and these can be manufacturer-specific.

Step 4 – Reassemble and Test

Reassemble in reverse order.
Turn the mains back on slowly.
Test the tap.

If it still leaks, the issue may be the tap seat.

What If the Tap Still Leaks?

If replacing the washer doesn’t fix it, the tap seat may be damaged. The seat is where the washer presses to form a seal. Over time, it can become pitted or worn.

This requires reseating with a specialised tool, something most DIY kits don’t include.

If left untreated, a damaged seat will destroy new washers quickly.

This is usually the point where calling a plumber makes financial sense.

When Should You Call a Plumber?

Call a licensed plumber if:

  • The tap continues dripping after replacing washers
  • You suspect a damaged tap seat
  • The ceramic cartridge is hard to source
  • There is corrosion inside the body
  • You want to upgrade to a new tap

In many cases, especially in older NSW homes, replacing the entire tap can be more cost-effective long-term than repeatedly repairing it.

Our plumbers arrive with a fully stocked mobile showroom, so if you decide to upgrade, you can choose a new tap on the spot.

We provide leaking tap repairs and replacements across Newcastle, Canberra, Central Coast and Hunter Valley.

If you need help, call 13 10 91. We’re available 24/7 for emergencies.

How Much Water Does a Dripping Tap Waste?

A tap dripping once per second can waste over 20,000 litres per year.

That’s water you’re paying for.

Fixing a leaking tap isn’t just about peace and quiet, it’s about efficiency.

Tips to Prolong Tap Life

  • Avoid overtightening
  • Use waterproof lubricant on spindles and O-rings
  • Check water pressure if leaks are recurring
  • Replace washers early before they harden

Small maintenance prevents big problems.

Frequently Asked Questions

Why is my tap dripping even after I replaced the washer?
The tap seat may be worn or the incorrect washer size was used.
If the handle turns only a quarter or half turn, it likely uses a ceramic cartridge.
Yes, if it’s a washer issue. Ceramic cartridges and damaged seats can be more complex.
Basic washer repairs are cheaper. If the tap body is old or corroded, replacement may be more cost-effective.

Most repairs take under an hour unless parts are severely damaged.

THE DOCTOR GETS IT DONE

• Licensed & Local • Fast, Reliable Service • 24/7 Emergency

Speak to a Plumber – 13 10 91

General Plumbing & Electrical | Hot Water Systems | Blocked Drains | Gas Fitting & more. .