How to Fix a Swimming Pool Leak

As an experienced swimming pool owner, I know firsthand how frustrating it can be to discover a leak in your pool. Not only can leaks cause significant water loss, but they can also lead to expensive repairs if left unchecked.

Over the years, I have encountered various types of leaks, ranging from minor leaks around the pool’s fittings to major leaks in the pool’s structure. Through trial and error and research, I have learned effective methods for identifying and repairing pool leaks.

Therefore, In this article, I will share my tips on how to fix a swimming pool leak, so you can avoid costly repairs and enjoy your pool to the fullest.

Causes of Swimming Pool Leaks

Before going into the nitty-gritty of fixing the swimming pool leaks, let’s look at some of the root causes of pool leakage. Swimming pool leaks can be caused by various factors, ranging from natural wear and tear to poor installation and maintenance.

1. Damaged Pool Structure

One common cause of pool leaks is damage to the pool’s structure, which can result from age, exposure to harsh weather conditions, and improper construction.

Over time, the pool’s concrete or vinyl liner can crack or develop holes, allowing water to seep through and escape the pool.

2. Damaged Pool’s Plumbing System

Another cause of pool leaks is damage to the pool’s plumbing system. Pool pipes can become damaged or deteriorated due to exposure to chemicals, extreme temperatures, and normal wear and tear.

If the pool’s plumbing is damaged, water may leak from the pool’s fittings or valves, leading to significant water loss.

3. Damaged Pool’s Fitting

In addition, leaks can also be caused by damage to the pool’s fittings, including skimmers, drains, and return lines. If these fittings become cracked or damaged, water may leak out of the pool and into the surrounding area.

4. Poor Maintenance

Poor pool maintenance can also contribute to the development of leaks. If the pool’s chemical balance is not properly maintained, it can cause corrosion and deterioration of the pool’s structure and plumbing system, leading to leaks.

5. Natural Disasters

Lastly, natural disasters such as earthquakes and heavy rainfall can also cause pool leaks. These events can damage the pool’s structure, fittings, and plumbing system, leading to significant water loss.

These factors can cause swimming pool leaks. Moreover, identifying the cause of the leak is crucial in effectively repairing the problem and preventing further damage to the pool.

How to Fix a Swimming Pool Leak?

Repairing a leak in your swimming pool can feel daunting, but don’t worry; it can be accomplished effectively with the proper tools and methods. And to assist you in resolving the issue, here I’ve discussed a detailed step-by-step procedure:

1. Identify the source of the leak

The first step in fixing a pool leak is to identify the source of the problem. You can do this by conducting a dye, pressure, or bucket test to determine where the water is escaping from.

How to Fix a Swimming Pool Leak

Moreover, the concrete pool leak detection process can be fairly transparent if you know what to look for. For example, if you are experiencing any of the following, you are likely to leak:

  • Cracks or gaps in the concrete vessel
  • Settling the vessel into the ground
  • Displaced or loose tiles
  • Mushy spots or standing water around the pool
  • Needing to add more water than usual
  • Algae forms quickly after a chemical treatment
  • The automatic filler constantly releases water

2. Prepare the area

Once you have identified the source of the leak, you need to prepare the area around the leak by draining the water level to below the affected area. This will allow you to work on the pool surface without water getting in the way.

Numerous techniques exist for removing water from a pool. Choose the method that best suits your specific situation.

3. Fix the leak

The next step is to fix the leak itself. The repair method will depend on the source of the leak. For example, if a cracked or damaged fitting causes the leak, you will need to replace the fitting.

Moreover, if the leak is caused by a crack in the pool’s structure, you may need to apply a patch or sealant to the area.

4. Test the repair

After you have fixed the leak, you need to test the repair to ensure it works effectively. You can do this by filling the pool back up to the normal water level and monitoring the water level over time. If the water level remains steady, then the repair was successful.

5. Maintain the pool

Finally, it’s important to maintain the pool regularly to prevent future leaks. This includes keeping the water chemistry balanced, ensuring proper circulation and filtration, and checking for any signs of damage or wear and tear.

How to Fix a Pool Leak Underwater?

If you’re facing a swimming pool leak, you may wonder how to fix it. One solution is to use underwater swimming pool sealant, an extremely strong, single-component adhesive and sealant specially designed for use in the swimming pool and spa area.

This sealant is ideal for direct underwater use and can be used in freshwater, saltwater, and chlorine pools. It’s designed for various underwater pool sealing and gluing tasks in and around the swimming pool.

Notably, the best part is that you don’t need to drain the pool to use this product, which helps conserve water. This sealant can fix or repair underwater leaks or damages without emptying the pool.

How to Fix a Leak in a Swimming Pool Skimmer?  

One of the most prevalent issues with swimming pools is when the plastic skimmer separates from the concrete pool, leading to leaks. Fortunately, this problem can be easily resolved with the help of pool putty.

However, in-ground concrete pools commonly develop leaks at the skimmer over time due to the expansion and contraction of the pool and deck, which can break the seal between the pool wall and the skimmer.

If you are wondering how to fix a leak in a swimming pool skimmer, the most effective way is by using repair putty. The first step is to locate the exact area of the leak along the seam.

Once you have identified the leak, take a piece of underwater pool repair putty from the tube and knead it with your fingers. Repeat this process over the leak area several times, ensuring the putty is properly applied.

Remember: After applying the putty, use your fingers to smooth it out, and then allow it to cure for approximately 24 hours. The putty should change to white, indicating that it has hardened and is ready to use.

FAQ’s: How to Fix a Swimming Pool Leak?

It’s inconvenient, and replacing pool liners can cost hundreds (sometimes thousands) of dollars. That’s why I recommend keeping Flex Tape and a repair kit nearby. The next time with this problem, use Flex Tape, and the pool leak will be repaired in minutes.

Often, cracks in your pool start small and are generally only cosmetic. However, it is recommended recommend that these cracks be repaired right away. The longer you wait to repair them, the worse they get.


Swimming pool leaks can be frustrating for any pool owner. However, by identifying the signs of a leak early on and taking the necessary steps to fix it, you can prevent further damage and save yourself a significant amount of money in the long run.

Whether you hire a professional to locate and repair the leak or attempt to fix it yourself, addressing the issue as soon as possible is essential. Don’t ignore any signs of a leak, such as decreased water levels or soggy areas around the pool.

By following the tips outlined in this blog post, you can learn how to fix a swimming pool leak and enjoy your pool to the fullest. Now that you’ve learned how to fix a swimming pool leak, why not put your knowledge to the test?