A leaking mixer tap can be a frustrating and wasteful problem in any household. Whether you’re dealing with a dripping spout or a mixer tap leaking from its base, this guide will help you understand the causes and provide step-by-step instructions on how to fix a leaking tap. While many mixer tap leak issues can be resolved with some DIY know-how, remember that for complex problems or if the issue goes beyond the simple ‘fix leaking tap’ query, it’s always best to consult a professional plumber. For expert assistance with mixer tap installation or repairs, My Home Plumbing is here to help.

What is a Mixer Tap? 

A mixer tap, also known as a combination tap, is a plumbing fixture that blends hot and cold water streams to deliver water at the desired temperature through a single spout. It consists of several key components:

  • Handles or levers (usually one or two): These control the flow and temperature of water.
  • Body or housing: The main structure that holds all internal components together.
  • Cartridge or valve: The internal mechanism that controls water flow and mixing.
  • O-rings and washers: Rubber seals that prevent water from leaking between components.
  • Spout: The outlet where mixed water flows from the tap.
  • Aerator: A small device at the spout’s end that mixes air with water to reduce splashing and conserve water.

Understanding these parts and their functions is crucial when learning how to repair a leaking tap, as issues can arise in any of these components.

Causes of a Leaking Mixer Tap 

Before beginning to attempt fixing leaking tap issues, it’s important that you identify the root cause of the problem. Here are some common reasons for a mixer tap leaking:

Broken Washer 

A worn or damaged washer is one of the most frequent causes of a leaking tap. Over a period of time, washers can slowly deteriorate, leading to inadequate sealing and allowing water to seep through.

Damaged Washers/O-Rings 

Similar to washers, O-rings also play a crucial role in preventing leaks. When these rubber seals wear out or become damaged over time, they can cause a mixer tap leak, often from the base or handles of the tap.

Excessive Pressure 

High water pressure can put a strain on the internal components of your tap, potentially causing leaks. This issue is especially common in areas that tend to have fluctuating water pressure.

Loose Parts 

On occasion, a leaking mixer tap can simply be caused by components that have come loose over a long period of time. This can include the body screws, cartridge, or even the spout itself.

Faulty Cartridge 

The cartridge is the heart of a mixer tap, responsible for controlling water flow and temperature. A worn or damaged cartridge can lead to a number of issues, including leaks from different parts of the tap.

Fixing a Leaking Mixer Tap 

Now that we’ve covered all the potential causes, let’s go through the steps on how to fix mixer tap leak issues:

Turn Off Your Water Supply 

Before you begin any repairs, it is important to locate and shut off the water supply to your tap. This is typically done via isolation valves under the sink or at your property’s main water shut-off valve.

Remove Tap Handles 

Carefully remove the tap handles or levers. There is usually a decorative cap hiding a screw that needs to be removed. Use a flathead screwdriver to gently pry off the cap and then simply unscrew the handle.

Disassemble the Tap 

Once the handles have been removed, you’ll need to also remove the tap body cover or shroud. Doing this will expose the cartridge and other internal components. Be sure to take note of how everything fits together as you disassemble, so that reassembly is smooth.

Replace the Cartridge 

If the cartridge proves to be the culprit, you’ll need to replace it. Unscrew the retaining nut and carefully remove the old cartridge. Take your cartridge to a plumbing supply store to ensure you get an exact replacement.

Reassemble the Tap 

With the new cartridge in place, carefully reassemble the tap in the reverse order of disassembly. Make sure all the parts are tightened properly, but be careful not to over-tighten, as this can cause damage.

Turn on Your Water Supply 

Once you are confident every part of your tap has been reassembled in place, slowly turn the water supply back on. Be sure to check for any leaks around the base, handles, and spout.

Test it out 

Run the tap through its full range of motion, checking both hot and cold water. Ensure there are no leaks and that the water flow and temperature control are working correctly.

When to Call a Professional Plumber 

While many leaking mixer tap repair tasks can be handled by DIY enthusiasts, there are times when it’s best to call in a professional:

  • If you’re unsure about any step in the repair process
  • When the leak persists after attempting repairs
  • If you notice any damage to the plumbing behind the wall
  • For older taps that may require specialised knowledge or tools
  • If you’re dealing with a complex, high-end tap system

Remember, attempting repairs beyond your skill level can actually lead to more significant and costly problems down the line.

Contact My Home Plumbing 

Fixing a leaking tap can be a straightforward process with the right knowledge and tools. However, if you’re facing persistent issues or prefer to leave it to the experts, My Home Plumbing is here to help. Our team of skilled professionals can handle all types of mixer tap leaks, ensuring your plumbing is in top condition.

For expert mixer tap installation or repairs, don’t hesitate to contact us. We pride ourselves on providing efficient, reliable, and high-quality plumbing services across Sydney’s inner suburbs. Let us take the stress out of your plumbing problems and keep your taps running smoothly.