Why Is My Pool Leaking? Top Causes of In-Ground Pool Leaks (2024)

Why Is My Pool Leaking? Top Causes of In-Ground Pool Leaks (1)

Whenidentifying and fixing a leak in an in-ground pool, the first step is to locate the problem area. Unfortunately, this can be one of the toughest parts of the process! Common places for water to leak are along seam orientations, around skimmers and light niches, on the sides or even beneath the coping stones, or through cracks in concrete surfaces if your pool is installed on a slab.


There are many reasons for leaks in swimming pools.
  • Pumps and motor problems can cause a swimming pool leak.
  • General wear and tear on the pool surface can cause leaks.
  • Broken plumbing beneath the pool deck can saturate the ground.
  • Loose fittings on railings, tiles, and other accessories lead to leaks.

These problems also apply toslab leaks,spa tubs,and other in-ground water features.

It may be more difficult to find a leak inanin-ground pool, but the leak must be repaired to avoid ground saturation, flooding,and water waste. Depending on thetype of in-ground pool, there will be different risk factors for leaks.

Fiberglass Pool Leaks

This type of pool or spa tub can last for 25 years or more without problems. Fiberglass in-ground pools and hot tubs are pre-fabricated shells that are placed in a hole prepared for their size. They should be set in gravel, although many fiberglass pools are backfilled with sand.

Cracks and leaks can occur in the plumbing when the surrounding sand becomes saturated or it settles. Finding plumbing leaks is not easy since the intake and return lines are under the pool decking.

Fiberglass pools may also have fissures in the gelcoat surface from improper handling and installation. These cracks should be repaired and repainted to keep the fissures from spreading and causing leaks.

The pool must remain full to maintain enough pressure to keep the surrounding ground from pushing a bulge into the fiberglass shell. This can happen when the ground is wet from rain or a leak.

Vinyl Pool Leaks

Tears in the vinyl lining are a major cause of swimming pool leaks in this type of surface. Sharp objects hitting the side of the pool or a careless swimmer can cause a tear in the vinyl surface.

Vinyl tears are easy to patch but they must be treated immediately to stop the leak from spreading.

Concrete Pool Leaks

Many in-ground swimming pools in Florida are concrete or gunite, the gravel and concrete composite. These are the most durable pools with a lifespan of decades.

A crack or fissure in the pool's surface must be repaired immediately. This type of crack can come from age or sharp objects hitting the side of the pool. Decorative tiles can become detached from the surface. Railings, the skimmer pad,and other fittings can also become loose.

The repair may be as simple as injecting a flexible polymer adhesive into a swimming pool leak. This can be applied while the pool is filled.

Pumps and Plumbing

Underground leaks can be caused by corrosion or movements in the ground. PVC pipes can be easily repaired unless damage is extensive. Then they have to be replaced.

When trying to determine the cause of a decreasing water level in a swimming pool, it is important to make sure that the skimmer valve is closed. If this does not stop the water from dropping, then the risk of pump damage should be considered and a submersible pump should be used instead. If this still does not resolve the issue, it is likely that there is a leak somewhere else in the system; therefore, a leak detection dye test can be done when the water stabilizes at any particular level. To locate where the leak may be coming from, careful inspection should be made during this time, as it could be coming from any number of places such as small openings or cracks in the pool walls or piping. Small debris which gets sucked into these tiny voids can often provide an indication of where a potential leak may be happening. With knowledge of locations and signs to look out for during inspections, leaks can more easily be identified and solved.

Questions to Consider When Pinpointing an Indoor Swimming Pool Leak

Is the Pool Leaking Only With the Equipment On?

Leaking on the pressure side of the plumbing, (after the pump) can cause much more noticeable leakage than dripping on the suction side does. If you notice any water consistently running out of the waste or backwash line, your pool may be leaking.

On the other hand, if there are no obvious sources of leakage while the filter pump is on, you may need to inspect parts of your pool that may not be under pressure where small drips can become full-blown gushers without being noticed until it's too late. It's best to check areas downhill from your pool for weepers where underground leakage may be surfacing near your foundation or anywhere else outside your pool area.

Is the Pool Leaking Only With the Equipment Off?

If the pool leaks when the equipment is off this could mean that there is an issue with the suction side of your pool plumbing. With the filter pump on, this can create a vacuum in pipes leading from the pool to the pump. It’s possible that the air entering through these pipes is coming from elsewhere, like a small crack or a broken seal. If this is the case, you may notice air getting trapped in your pump basket with a clear lid, bubbling out of your return lines, or building up inside your filter tank.

Does the Pool Leak All the Time?

The most common reason inground pools leak is due to holes or cracks in the pool’s shell. This makes it essential to conduct a thorough pool leak detection process to identify any weaknesses or fractures that could be making the pool vulnerable to leakage. Careful examination of the tile line, plaster, and vinyl should be done, as well as inspecting inside the skimmer(s). A common problem with leaks is where there is a separation between the plastic skimmer and the concrete pool. Fortunately, this type of leak is usually straightforward to fix.

It's also helpful toperform a dye test -when the pump is turned off and the water remains still, place a bit of dye near any suspicious cracks and holes and observe if it travels somewhere, which would indicate a leak. By taking all these steps into account during a pool leak detection process, one can gain insight into whether or not their pool may have been leaking for some time.

Are There Leaks at the Equipment Pad?

The first step in finding an equipment pad leak is to look closely at the filter, pump, heater, and valves on the pad. It is important to make sure all these components are secured properly and not leaking. Visual inspection may help identify any loose components or build-up of calcium deposits from hard water that could cause a small drip.

Secondly, checking for moisture around the ground surrounding the equipment pad may indicate a leak which might have pooled around the equipment pad’s base plate seal. If this is found then it’s essential to take further steps as it could lead to corrosion of additional parts resulting in higher leakage over time.

The Experts at Aquaman Leak Detection Can Help!

Aquaman Leak Detection uses sophisticated sonar equipment to find and fix a swimming pool leak from plumbing lines under the decking.The entire deck does not have to be torn up to repair a return line leak.

Check the suction lines that carry water to the filter, heater,and chlorinatorfor leaks. This system starts at the skimmer that is designed to keep the piping free of debris.

Pumps should also be checked for wear in the system. A new impeller or hose may be necessary.

Aquaman Leak Detectionoffersmodern technology to find and repair leaks. Our service includes our warranty.Contact uswith any questions if you suspect your swimming pool is leaking.

Why Is My Pool Leaking? Top Causes of In-Ground Pool Leaks (2)

Why Is My Pool Leaking? Top Causes of In-Ground Pool Leaks (3)

By Aquaman

We now proudly serve all of Florida. Each of our trained and certified pool leak detection specialists utilize the most advanced methods and technologies.

Why Is My Pool Leaking? Top Causes of In-Ground Pool Leaks (2024)

FAQs

Why Is My Pool Leaking? Top Causes of In-Ground Pool Leaks? ›

Swimming pool leaks can have various causes, including structural issues, plumbing problems, skimmer or return line leaks, equipment issues, ground movement, and improper maintenance.

What is the easiest way to find a leak in an above ground pool? ›

Ensure the pool is full (so the leak's not above the water level). Feel the pool's floor to see if it's squishy, which suggests a leak in the bottom of your liner. Wherever you suspect a leak, place a few drops of food coloring. Continue placing food coloring around your pool until you find the leak.

Why is my pool pump leaking from the top? ›

In some cases, the lid has cracked which will require repair or replacement. Also, pump lids need to be on very tight, and pump lid o-rings need to be lubricated. A dry o-ring or loose pump lid will most likely drip when the pump shuts off.

What is the most common inground pool leak? ›

Most Common Places Where Pool Leaks Happen

The skimmer. The skimmer is common for small holes, cracks, and weak spots that can leak. The return lines. These are also common for leaks to occur because they are thin and made of the same material as the skimmers.

How do I find out what is causing my pool leak? ›

Look closely at the filter, pump, heater, and valves. Check the ground for moisture. Turn the pump on and off, looking closely for spraying water when the pump is turned off. A small drip or two will not be the source of the primary leak.

How to fix a leak in an above ground pool without draining it? ›

Patch the hole with a waterproof epoxy without draining the pool.
  1. Locate the area that has the hole.
  2. Clean around the hole with a cloth. ...
  3. Cut a patch from the material that is at least 1 inch bigger than the hole all the way around.
  4. Spread cement over the entire underside of the patch.

How do I stop my pool from groundwater seepage? ›

Direct the Water Far from the Pool.

Make sure to pump the water to a storm drain, or other location, that is downhill and far removed from the pool. Directing the drained water to a location far from your pool and downhill should prevent the water from seeping into the ground underneath the pool.

How do I know if my pool pump shaft seal is leaking? ›

Signs of a leak in the shaft seal:

Puddle of water on the ground under the center of the pump underneath the motor connection point. Water damage to the surrounding area.

Is it normal for above ground pools to leak? ›

The danger of leaking is one of the major drawbacks of an above-ground pool. Because pool liners are often composed of thin vinyl, they can easily be pierced by sharp items or worn down by repeated contact with pool chemicals.

Why is my water pump leaking from the top? ›

Leaks tend to occur when the gaskets and seals that connect the water pump to the cooling system fail as they get older, causing coolant liquid to leak and puddle under the engine. This can grow into a more serious issue when the water pump casing develops a leak.

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

6. 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.

How do I stop my inground pool from leaking? ›

Most pool leaks are easy to fix once found. Simple repairs usually involve a bit of pool putty, waterproof silicone, a vinyl patch, or a plaster patch. Very small plumbing leaks can sometimes be patched with Pentair Stop Leak, but this shouldn't be considered a solution for major plumbing leaks.

What is a structural leak in a pool? ›

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.

Where is the most common place for a pool leak? ›

Some of the most common places where pool leaks happen include:
  • Pool Liners. Pool liners cover the swimming pool's wall and floor structure. ...
  • Pool Pump. You can view the pump as the heart of the pool. ...
  • Pool Filters. ...
  • Underground Plumbing. ...
  • Pool Skimmer. ...
  • Structural leak. ...
  • Pool Leaks Can Happen.
Dec 15, 2020

How do I make my pool leak proof? ›

4 Steps for Waterproofing Pools
  1. Smooth the Substrate. You need to bring any variations in the pool's wall or floor (the mortar bed bonded to the cementitious waterproofing), within acceptable flatness levels. ...
  2. Clean the Substrate. ...
  3. Apply the Waterproofing Membrane. ...
  4. Test for Leaks.

Is there something you can put in a pool to find a leak? ›

Tips on Finding a Leak in a Pool

Note where excess water appears to be pooling in the yard or on the concrete. Rule out normal evaporation first by using the bucket test method (see Step 3). Check for inconsistent chemical levels, as this may indicate a pool leak. Use food coloring to confirm a suspected leak.

How do you pinpoint a pool leak? ›

Keep an eye out for puddles of water in the grass, cracked pool tiles, and cracked concrete. You may also notice cracks in the vinyl or plaster or find that your skimmer is separating from your concrete. Next, turn off the power to your pool equipment at the breaker, and head to your equipment pad to check for leaks.

How to fix a leak in a pool liner above ground? ›

You could use waterproof tape, a vinyl patch kit, peel-and-stick patches, or a pool liner repair kit. For small rips and quick fixes, waterproof tape can hold the liner together and quickly stop leaks.

How to patch a pool without a patch kit? ›

To quickly repair a pool liner without a patch kit on hand, you can use waterproof tape or even duct tape over the tear. While these solutions are helpful, they work best as temporary fixes until you can purchase a patch kit or hire a pool repair professional.

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