how to fix a leaking mixer tap

How to Fix a Leaking Mixer Tap in 6 Easy Steps

Everyone experiences a leaky tap at some point in their life. It’s one of those very annoying plumbing problems that many tend to put off fixing until it’s too late. If several leaking taps are left for too long, it has the potential to cause some serious damage to both your house and your wallet.

Repairing mixer tap leaks and dripping taps is actually a very simple DIY job that anyone can perform regardless of experience level, and the sooner you get onto it, the less water and money you’ll lose down the drain thanks to things such as poor water pressure.

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What is a Mixer Tap?

Mixer taps are the most common style of tapware found in Australian homes today. Traditionally, bathrooms, kitchens and laundries featured a 3-piece tap set which consisted of separate hot and cold water taps and a tap spout. Most taps like this have a more streamlined and modern design, allowing users to control the flow and ‘mix’ the temperature of their water with a single handle.

What is a Ceramic Cartridge?

Traditional 3-piece tapware often features an internal rubber seal, or tap washer. Over time, this washer would perish and cause leakages. Instead of a rubber washer, most modern tapware is constructed with a highly durable ceramic cartridge.

A ceramic cartridge consists of a pair of discs that sit atop one another. The bottom disc remains fixed while the upper disc rotates when the handle is operated. When the handle is turned on, the upper disc moves, permitting either cold or hot water to flow through the mixer. When the handle is returned to its ‘off’ position, the ceramic disc blocks the water flow.

Whilst ceramic discs are far more advanced and durable than washers, they can still be prone to cracks and scratches which can cause leakages.


In order to fix your leaking mixer tap, you will need:

  • Replacement cartridge (if you are unsure as to what cartridge you need, consult your tap manufacturer)
  • Allen key
  • Small, flat-blade screwdriver
  • Stanley knife
  • Adjustable spanner
  • Pipe wrench

Please note: Any plumbing tasks that are beyond replacing cartridges (such as replacing internal components) should be left to the professionals. Before carrying out any other plumbing work, check with your state’s plumbing regulations. Performing unlicensed plumbing work is illegal and you will not be covered by insurance.

diagram of a mixer tap

How to Fix a Leaking Mixer Tap

1. Turn Off Your Water Supply

The first step to repairing a leaking or dripping tap is to ensure that the water supply to your mixer tap has been turned off. You can turn off the water supply at either a stop valve or isolation valve. The stop valve can be found next to your water meter and the isolation valve on the supply pipes below your sink.

Turn on your mixer to release any remaining water left in your pipes, then put a plug in your basin or sink to prevent any tap components from falling down the drain as you work.

2. Remove Plastic Cap/Cover

Your first real challenge when fixing a mixer tap leak is locating and removing the cap that conceals the grub screw. On most hot and cold taps, this cap is the hot/cold indicator button found on your mixer handle.

You can sometimes lift the cap off by using your nails, but if you are struggling, you can use a Stanley knife to carefully lift the button and a small, flat-head screwdriver to finish prying it out. If you’re not careful you may damage the cap, but replacements can be found easily at most plumbing and hardware stores.

3. Remove the Grub Screw & Handle

After you’ve successfully removed the cap from your mixer handle, you’ll find a grub screw located in the hole underneath. This screw is what fixes your handle to the base of your mixer tap. Use your Allen key to undo the grub screw until you can lift the handle off the cartridge spindle. The grub screw sizes vary tap to tap, but a 2mm or 2.5mm Allen key generally does the job.

Sometimes a build-up of calcium carbonate, commonly known as limescale, can cause the mixer handle to stick to the base. If you are finding that the limescale is preventing you from removing your mixer handle, soak your mixer in a half water, half vinegar combination. After about 20 minutes of soaking, you should be able to remove your mixer handle.

4. Remove Chrome Dress Ring & Retaining Nut

The next step is to remove the chrome dress ring. There are no flat sides on this ring so you will need to use a pipe wrench. After removing the dress ring, you will discover a brass retaining nut. Use your spanner to unscrew and remove to find your mixer’s ceramic cartridge. If you are worried about damaging your tap’s finish, use an old rag in between your tools and the mixer.

5. Replace the Cartridge

Once you have gained complete access to the cartridge, gently remove and replace it with a new one of the exact same model. Ensure that you follow any instructions provided by the manufacturer and that the cartridge’s locator pins match up.

6. Reassemble the Mixer & Turn On Water Supply

Once the new cartridge has been fitted, reassemble your tap and then reactivate your water supply at either your stop or isolation valve. We recommend that you keep towels in place in case there are any leakages. If you have tested your mixer and are satisfied with the result you are done!

Contact Tunnel Vision - Perth's Plumbing Specialists

To fix a leaking or dripping mixer tap, all you need is time and dedication. You can use the information in this article to help you, but we understand that not everyone has the time to do so and simply want to restore a leaky tap while preventing future leaks with a quick and smooth operation.

If you need help fixing just one or several leaking water taps, consult a plumbing expert such as Tunnel Vision. Our team of highly experienced plumbers have the experience and skills required to fix any plumbing problem, fast. For all enquiries, contact Tunnel Vision on 1800 631 799 or book online!

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Do You Have a Leaking Tap? Contact Tunnel Vision Today!

Call us on 1800 631 799 or book online

Frequently Asked Questions

Can a Leaking Mixer Tap Increase My Water Bill?

Wasting water is not just an irresponsible use of a valuable resource, but it can also cost you a significant amount of money in bills. The most common cause for a high water bill in Australia is running water from your toilet and a leaking tap. A leaking tap can consume as much as half a litre of water per hour. That’s 12L/day or 4380/L a year! If you have a large leak or several leaking taps, this can rack you up a hefty water bill very fast.

Can a Leaking Mixer Tap Cause Damage?

Leaking taps cause high water bills, but they can also cause serious damage to your property. Leaking water can result in floor and ceiling damage and consequently very expensive repairs. We recommend that you fix a leaking tap as soon as possible to avoid future complications.

What Are Some Early Warning Signs of a Leaking Mixer Tap?

If your mixer tap is showing some of the below warning signs, we recommend consulting a plumber to inspect it and to discuss your options.

  • Rust and corrosion present on the surface
  • Limescale build-up on the surface
  • Stiffness when operating the mixer handle
  • Missing buttons and covers
  • Water pressure that is lower than normal
  • Difficulty in selecting and maintaining a consistent temperature

What Are Some Major Warning Signs of a Leaking Mixer Tap?

If you have noticed any of the below major warning signs in your mixer, contact a plumber immediately to avoid a potential plumbing emergency.

  • Major rust and corrosion present both internally and externally
  • Limescale build-up present both internally and externally
  • Spout is cracked and leaks while in use
  • Rusted, kinked, damaged or leaking hoses under your sink
  • A constant drip from your mixer when turned off
  • Missing handles or broken parts