How to Stop Leaky Pipes Under Your Kitchen Sink

Discovering a leaking pipe under your kitchen sink can be a distressing experience. Not only does it disrupt your daily activities, but it can also lead to more severe problems if not addressed promptly. This article aims to guide you through the steps to diagnose and fix a leaking pipe under your kitchen sink effectively.

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Importance of Timely 
Intervention in Addressing 
Leaky Sinks 

By Chris Provenzale | August 2023

  • Founder / Director of Dr Leak Plumbing
  • License No. 368473C
  • Certificate IV in Plumbing & Services
  • Certificate III in Roof Plumbing
  • Kitchen, Bathroom & Laundry Renovation (KBLR) Licenced


Ignoring a leaking pipe can lead to a host of problems, including water damage to your cabinets and floors, increased water bills, and potential health risks due to mould growth. Therefore, it's crucial to address the issue as soon as you notice it to prevent further complications.


Identifying the
 Source of the Leak


Initial Steps for Diagnosis

Before diving into repairs, it's essential to identify the source of the leak. Start by clearing out the area under the sink to give yourself a clean working space. Place a bucket or towel under the leaking pipe to catch dripping water. This will help you observe where the water comes from and what kind of leak you're dealing with.


Common Areas to Check

1. Drain Pipe:

Often, leaks originate from the drain pipe. Check for loose connections or worn-out gaskets that may need tightening or replacing.

2, Faucet Base:

Sometimes, the leak may be coming from the base of the faucet. Inspect the area for any signs of water.

3. Supply Lines:

These are the pipes that bring water to your faucet. Check for any signs of wear and tear or loose connections.

4. P-Trap:

This is the U-shaped pipe under your sink. Clogs or loose connections here can also cause leaks.

5. Valves:

Check the water shut-off valves for any signs of leakage. Sometimes, these can become loose over time and may need to be tightened.

By following these initial steps and checking common areas, you'll be better equipped to identify the source of the leak and take appropriate action.


Contact a plumber

Types of Leaks
 Under the Kitchen Sink

Drain Pipe Leaks

One of the most common types of leaks under the kitchen sink originates from the drain pipe. This is often due to loose connections or worn-out gaskets. You may notice water pooling at the base of the pipe or see droplets forming along the pipe's length.


Faucet Leaks

Leaks can also occur at the base of the faucet or where the faucet connects to the supply lines. This is often due to worn-out O-rings or a corroded valve seat. Faucet leaks can be particularly troublesome as they can go unnoticed for a long time, leading to water damage in the cabinet below.


Supply Line Leaks

The supply lines bring water to your faucet, and leaks here can be due to loose connections or deteriorating pipes. These leaks can be more severe as they involve pressurised water, making it crucial to address them promptly.



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DIY Fixes for
 Leaking Pipes


Tightening Loose Connections

One of the simplest fixes for a leaking pipe is to tighten any loose connections. Use an adjustable wrench to gently tighten the nuts and bolts connecting the pipes. Be careful not to overtighten, as this can lead to further damage.

Replacing Worn-Out Gaskets

If you notice that the gaskets or O-rings have deteriorated, replacing them can often fix the leak. Make sure to turn off the water supply before attempting this fix. Remove the old gasket and install a new one that matches the size and type of the original.

Using Epoxy Putty or Silicone Tape

For a quick but temporary fix, you can use epoxy putty or silicone tape to seal small leaks. These materials are water-resistant and can provide a temporary seal until you can perform a more permanent repair. Follow the manufacturer's instructions for the best results.




Removing Clogs from the P-Trap

Clogs in the P-Trap can lead to water backup and potential leaks. To remove a clog, first place a bucket under the P-Trap to catch any water. Then, use a pipe wrench to loosen the slip nuts and remove the P-Trap. Clean it thoroughly to remove any debris or build-up and then reattach it, making sure all connections are tight.

Replacing the P-Trap

If the P-Trap is corroded or damaged, it's best to replace it entirely. After removing the old P-Trap as described above, take it to a hardware store to find a matching replacement. Install the new P-Trap, ensuring all connections are secure.

When to Use a Pipe Clamp

For more significant leaks that can't be immediately fixed, a pipe clamp can provide a temporary solution. A pipe clamp is a band made of metal or plastic that can be tightened around a pipe to seal a leak. While this is not a long-term solution, it can prevent further water damage until professional repairs can be made.


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When to  
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Signs of Severe Leaks

If you notice a large amount of water pooling under the sink, hear the sound of running water when all taps are off, or see signs of water damage in the surrounding area, these are indicators of a severe leak that requires immediate professional attention.

Risks of DIY Fixes

While DIY fixes can be effective for minor leaks, they come with risks. Incorrect repairs can lead to further damage and even flooding. If you're not confident in your ability to fix the leak yourself, or if the problem persists despite your efforts, it's advisable to seek professional help.




Regular Maintenance Tips

Regular maintenance is key to preventing leaks under your kitchen sink. Here are some tips to keep your plumbing in top shape:

  1. Regularly Check for Leaks: At least once a month, inspect the area under your sink for any signs of moisture or water damage.

  2. Tighten Connections: Periodically check the tightness of all pipe connections and tighten them if necessary.

  3. Clean the P-Trap: To prevent clogs, clean the P-Trap every 3-6 months.

  4. Inspect Gaskets and O-rings: Check the condition of gaskets and O-rings regularly and replace them if they show signs of wear and tear.


Products for Leak Prevention

There are several products on the market designed to help prevent leaks:

  1. Thread Sealant: Applying thread sealant to pipe threads can help create a more secure connection.

  2. Pipe Clamps: Having a few pipe clamps on hand can provide a quick fix for unexpected leaks.

  3. Water Leak Detectors: These devices can alert you to leaks even before they become visible, allowing for early intervention.


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In summary, a leaking pipe under the kitchen sink can be a significant inconvenience and lead to more severe problems if not addressed promptly. This article has guided you through identifying the source of the leak, various types of leaks, DIY fixes, advanced solutions, and preventive measures.


Contact Dr Leak Plumbing for Expert Solutions

If you're facing persistent issues with a leaking pipe under your kitchen sink and require professional assistance, don't hesitate to contact Dr Leak Plumbing. Our team of experts can diagnose and resolve any plumbing issues, ensuring you enjoy a comfortable and efficient home. Reach out to us today for a comprehensive solution to all your plumbing needs.


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Frequently asked questions

Why is my kitchen sink leaking only when I use it?

If your sink only leaks when used, the issue is likely related to the drain pipe or the faucet. Check for loose connections or worn-out gaskets and consider replacing them if necessary.

Can a leaking pipe under the sink lead to mould?

Yes, a persistent leak can create a damp environment conducive to mould growth. This poses health risks and makes it crucial to address the leak promptly.

How much does it cost to fix a leaking pipe under the kitchen sink?

The cost can vary depending on the severity of the leak and the required repairs. Minor fixes may cost as little as $50, while more complex issues requiring professional intervention can run into the hundreds.

Is it safe to use chemical drain cleaners to fix a leak?

While chemical drain cleaners can clear clogs, they are generally not recommended for fixing leaks. These chemicals can corrode pipes over time, potentially worsening the problem.

How can I tell if the leak is coming from the faucet or the pipes?

To determine the source, dry all areas around the sink and then run the water. Observe where the water starts to accumulate. If it's near the faucet, the leak is likely there; if it's at the base of the pipes, then the pipes are the likely culprit.

What should I do if the leak persists despite trying DIY fixes?

If the leak continues despite your best efforts, it's advisable to seek professional help. Persistent leaks can indicate a more severe issue that may require specialised tools and expertise to fix.

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