5 Common Causes Of Pool Leaks

5 Common causes of pool leaks

Eventually, your pool will need maintenance. It’s an unavoidable truth with most things in life. 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. What may help is knowing what the 5 common causes of pool leaks are.

– Mechanical Issues

– Structural Damage

– Plumbing

– Broken Pipes

– Loose or Broken Fittings

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 – 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)

– If you see air coming 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.

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.

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.

Read more about Leak Science here

Broken Pipes

Number 4 on our list of 5 common causes of pool leaks is broken pipes. This can include


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, complicating factors for finding leaks in pools. Since you should not drain a pool, it is very difficult to inspect 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 in them fails from rust or a rock obstructing 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.


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, therefore, often left even in 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.

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

5 Common Causes of Pool Leaks

Leaks can happen anywhere in your pool, at any time and you’ll want to catch and repair it 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 the professionals.

Posted on: December 27th, 2019 by admin
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