5 Common Causes Of Pool Leaks - (2023)

5 Common Causes Of Pool Leaks

5 Common Causes Of Pool Leaks - (1)

Even though you put a lot of effort into maintaining your pool, it will eventually need repairs. As each season passes, your pool gets subjected to harsh temperatures, extreme weather, and lots of use from the family. Because of this, it’s unavoidable that your pool may start to leak and need repairs. If you find yourself adding more than a quarter-inch of water per day or more than two inches of water per week, you may have a leak. In order to protect your pool, it’s important to know what the 5 common causes of pool leaks are.

Typically, pool leaks can be formed by one or more of the following issues:

(Video) Chasing pool leaks, Don't call a leak detection company until you watch this

  • Mechanical Issues
  • Structural Damage
  • Plumbing
  • Broken Pipes
  • Loose or Broken Fittings

Let’s dive into each issue so you can better understand the source of pool leaks. If you notice any of these problems with your own pool, make sure to call a professional leak detection company right away!

Mechanical Issues

If you have an automatic fill device on your pool, a drop in your pool’s water level may not be apparent. However, high water bills and a relentless fluctuating chemical imbalance can lead to an expensive “green pool” problem of excess algae growth, which can be an indicator of a leak problem.

If you have a vinyl liner pool, your pool skimmer may be where your leak is. Fortunately, it’s fairly easy to find and fix. The most obvious sign that your skimmer is leaking is that the water will drop to the bottom of the skimmer and the leak stops. To test this, either turn the pump off or close the skimmer valves and run the pump on drain only.

On our list of the 5 common causes of pool leaks, one that may be considered a pool owner’s worst fear is a leak in the skimmer pipe. Ripping up your pool deck and replacing the pipe is fortunately very rare. Signs of this being the case include

  • Your pool is leaking more when the pump is off (because when your pump is on it’s under a vacuum)
  • Seeing air come into the pump basket.

Related Topic: 10 Scary Facts About Pool Leaks

Structural Damage

Structure leaks due to structural damage can happen anywhere in your pool. If you can see a crack in your concrete or fiberglass pool then this would be the perfect place to investigate if you are losing water. Oftentimes, cracks in your pool start out small and are generally only cosmetic in nature. However, we recommend getting these cracks repaired right away. The longer you wait to repair them, the worse they get. This can lead to larger structural problems and expensive repair bills!

(Video) Swimming Pool Leaks | 5 Areas Your Pool Can Leak

Additionally, it’s common for leaks to happen around fixtures such as lights and returns. Investigate these areas by using the dye test. You can correct this by filling the opening of the conduit in the back of the socket with putty or other caulking agents appropriate for your pool construction material. If you aren’t sure how to fix the leak or don’t have the right equipment, call a professional leak detection company to handle the job.

Related Topic: How To Find A Leak In A Pool


Underground leaks can be caused by corrosion or movements in the ground, damaging your underground plumbing or possibly puncturing the floor of your pool. If you suspect a leak in your pool’s plumbing, contact Leak Science right away. Finding a leak underground and under the decking requires expert help with specialized sonar equipment. Additionally, the longer you wait to fix the leak, the more expensive the damage and water loss becomes.

Leak Science is the only pool leak detection company that can fix and find your leak, and completely restore your pool to its original condition like nothing ever happened. We will replace any flagstone or concrete that we had to remove, leaving your pool looking like new! This means you won’t have to worry about hiring an additional contractor after we’re gone.

Read more about Leak Science here!

Broken Pipes

Number 4 on our list of 5 common causes of pool leaks is broken pipes. Your pool’s plumbing system is complex, which unfortunately means that leaks can spring up in a variety of locations throughout the piping. This can include…

(Video) 5 Reasons to Repair Pool Leaks


When the pool and the pool return pipes settle in the ground at different rates, this almost always results in a leak where the return meets the pool wall. This type of leak is a very common leak location.


The main drain is one of the hardest and most complicated factors for finding leaks in pools. Since you should not completely drain a pool, it is very difficult to inspect the main drain without proper training or equipment. Main drains can leak around the fixture itself as well as through the suction pipe that connects to them. Additionally, the main drain can develop leaks in the hydrostatic relief valve. This is often caused when rust or a rock obstructs the valve from closing properly.


Unfortunately, the underside of a pool skimmer connection point is hard to get to. Concrete pool skimmers are usually encased in concrete on all sides, making the connection point that much harder to get to without high-tech equipment and trained ears.

This is why it’s so important to hire a professional leak detection company. The various tests for the multiple reasons for leaks can be costly, all while you’re losing water and increasing your water bill. At Leak Science, we use professional sonar equipment and our 10+ years of industry knowledge to quickly and efficiently identify the source of your leak.


Leaks in equalizer pipes are one of the most likely suspects with older swimming pools. The equalizer line in the pool is a non-pressurized pipe that connects from the main drain to the underside of the skimmer. Because it is usually found in older swimming pools, it is often left out of major renovations. Call your trusted leak detection company right away if you suspect you have a leak.

Loose or Broken Fittings

While breaks, cracks, or collapses in the pipe can happen anywhere, they are most likely to be where joint connections have been made. This is very common in both pools and spas and can be fixed easily if the location is easy as well.

(Video) Swimming Pool Leak Detection Lesson 5 - Concrete Pool Cracks & Structure Leaks

Related Topic: Pros and Cons of Hiring A Leak Detection Company

How do I know if my pool is leaking?

Leaks are frustrating to deal with on your own. Sometimes they are obvious and easily spotted. Other times, they may build up slowly over time, leaving you with expensive water bills and costly repairs. Thankfully, there are some signs you can look for to know if your pool has sprung a leak.

  • Changes in water level
  • Wet spots in your yard
  • Unusually high water bills
  • Cracks in your pool surface or pool deck
  • Loose, cracked, or shifting pool tiles
  • Algae growth in the pool
  • Standing water under pool equipment
  • Corroding pipes

If any of these signs sound familiar, contact us right away! We’re happy to help locate and resolve your leak so you can get back to enjoying your pool.

5 Common Causes of Pool Leaks

Swimming pools offer much-needed relief from summertime heat and an opportunity to have fun with your friends and family. But if you own a pool, you know how much maintenance they require. In addition to keeping them clean, it’s important to inspect them for leaks. The earlier you detect signs of damage, the better!

Leaks can happen anywhere in your pool and at any time. You’ll want to catch and repair leaks as quickly as possible. Leaks waste your money and worsen over time, causing increasing damage and compromising the structural integrity of your pool. Watch for any signs of damage and early signs of a leak. If you are adding more water than you normally do from evaporation or splashing, or notice an increase in your water bill, get your pool inspected by a professional leak detection company as soon as possible.

Posted on: October 19th, 2021by admin

(Video) How To Find a Pool Leak Like a PRO! (pt. 1)


5 Common Causes Of Pool Leaks -? ›

The most common causes of pool leaks are discussed below.
  • Tree Roots. ...
  • Seismic Pressure. ...
  • Ground Settling. ...
  • Aging Pool Equipment. ...
  • Chemical Imbalance. ...
  • Temperature. ...
  • Hot Tub. ...
  • Get Expert Swimming Pool Leak Repair from Manning Pool Service Today!

What causes leaks in pools? ›

Some of the most common causes of pool leaks include mechanical problems, structural damage, plumbing issues, broken pipes, and broken or loose fittings. When any of these problems occur, some parts of the swimming pool and the filtration system can begin to deteriorate with time.

Where is the most common pool leak? ›

Most pool leaks are not in the underground plumbing, although it's every pool owner's worst fear, a large backhoe coming in and ripping up the pool deck. It does happen occasionally, that a leak occurs at a pipe connector under the pool deck, or beneath the skimmer, but repair rarely involves a backhoe.

How do I find the source of my pool leak? ›

How To Find a Pool Leak Like a PRO! (pt. 1) - YouTube

How do you find leak on the bottom of a full pool? ›

Put on some goggles and grab an applicator filled with either leak finder dye or red food coloring, and again, make sure the pool pump is off. Swim to the bottom and get up close to the bottom of your pool's walls and floor. Look closely at those valleys and divots you saw earlier or if you see any holes.

Why is my inground pool losing an inch of water a day? ›

Pool Is Losing 1 Inch of Water Per Day

Losing more than ½” of pool water per day indicates you likely have a leak in your pool's structure or your pool pump system. You should call your pool service for a thorough leak inspection. You might not be able to keep up with refilling your pool at this point.

Why am I losing water in my inground pool? ›

Typically, pools lose water for one of two reasons: evaporation or a leak. Evaporation naturally occurs in any body of water, but it may increase under certain conditions, such as hot, humid weather. Leaks, however, indicate a bigger problem that a professional may need to address.

How do you find a leak in a skimmer line? ›

How Do I Repair an In-Ground Pool Skimmer Line? : Pool Maintenance

How do I know if my skimmer is leaking? ›

Detecting a Pool Skimmer Leak

Make a note of any cracks, and look for small bits of debris that have been sucked in. The problem area may be located underwater, at the waterline, or above water. You can find out for sure if a crack is leaking by conducting a dye test.

Why does my pool lose water overnight? ›

The differential that occurs between the pool water temperature and the air temperature on late summer nights causes water to evaporate at an accelerated rate. In some cases you might see a water level difference of 1-3 inches overnight. Depending on the size of your pool, that can be over 500 gallons of water loss!

How much water does a pool lose a day? ›

If pool owners or maintenance workers are constantly filling up the pool, there may be a leak. On average, swimming pools lose about a quarter of an inch of water each day, yet variations in wind intensity, humidity and sunlight can drastically change water loss rates.

How do you find a leak in a pool with food coloring? ›

How to find your POOL LEAK quick and easy. - YouTube

How do I find a pinhole leak in my pool? ›

How to ACTUALLY FIND Leaks in Pool Liner - YouTube

How do I know if my inground pool is leaking? ›

How To Test My Pool for a Leak - YouTube

How do I know if my pool liner has a leak? ›

POOL LEAK DETECTION: How to Patch a Liner | Swim University

How do you repair a pool leak? ›

How to Find and Fix a Leak in a Pool - YouTube

How much does it cost to fix a pool pipe leak? ›

If the leak is minor and can be easily repaired, the cost may range between $300 and $500. If a major leak that requires replacement or re-plastering is involved, however, the cost usually ranges somewhere between $2,500 and $5,000. Pool leaks can occur at any time in various places in your pool.

Why does my pool lose water overnight? ›

The differential that occurs between the pool water temperature and the air temperature on late summer nights causes water to evaporate at an accelerated rate. In some cases you might see a water level difference of 1-3 inches overnight. Depending on the size of your pool, that can be over 500 gallons of water loss!

How do you tell if your inground pool has a leak? ›

Here are 5 signs you can use to determine if your pool has a leak.
  1. Increase in the Water Bill. If you have a major spike in your water bill, it may be a sign that you have a pool leak. ...
  2. Standing Water. ...
  3. Fluctuating Chemical Levels. ...
  4. Algae or Discolored Water. ...
  5. Cracks In and Around Your Pool.
Nov 21, 2019


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