Fix a Pool Pipe Leak Under Concrete

Welcome to our comprehensive guide on fixing a pool pipe leak under concrete. As a new pool owner, you already know that maintaining your pool’s plumbing system is crucial to enjoying a clean and functional swimming experience. In this guide, we will walk you through the essential steps to detect, locate, and repair a pipe leak under your concrete pool deck. Timely action can prevent costly structural damage to your concrete pool and ensure your swimming pool stays in top condition. Let’s dive in!

The Significance of Timely Leak Detection and Repair

Fix a Pool Pipe Leak

Before we get into the nitty-gritty of fixing a pool pipe leak, let’s emphasize the importance of acting promptly. Ignoring a pool pipe leak can lead to significant problems, such as:

  • Structural Leaks: Unaddressed concrete pool leaks can damage the structural integrity of your pool wall, leading to costly pool repairs.
  • Plumbing Line Damage: Leaks can cause extensive damage to your pool plumbing, requiring expensive replacements of pool pipes and pipe fittings.
  • Increased Water Bills: Undetected pool leaks can result in higher water bills due to continuous water loss.
  • Environmental Impact: Conserving water is essential, and fixing pool leaks helps reduce water wastage.
  • Water Quality: Pool leaks can introduce contaminants into your swimming pool, affecting water quality.

Overview of Common Signs and Causes of Pool Leaks

Pool Leaks

Before you can fix a pool pipe leak, it’s crucial to recognize the signs and understand the potential causes. Common signs of pool leaks include:

  • Natural Water Loss vs. Actual Leaks: Differentiating between water loss due to evaporation and genuine pool leaks.
  • Observing Soil Dampness, Cracks, and Water Levels: Keeping an eye out for wet spots, cracks in the pool deck, and dropping water levels.
  • The Financial and Structural Implications of Undetected Leaks: Understanding the long-term consequences of neglecting pool pipe leaks.

Now that you understand why it’s vital to address pool leaks promptly and know what signs to look for, let’s move on to the process of recognizing and fixing them.

Recognizing the Signs of a Pool Leak

Natural Water Loss vs. Actual Leaks

It’s normal for swimming pools to experience some water loss due to evaporation and splash-out. However, it’s crucial to distinguish between natural water loss and actual pool leaks. Here’s how:

  • Evaporation: Water loss from evaporation is a gradual process and doesn’t leave behind visible wet spots around the pool.
  • Splash-Out: Splashing during pool activities can lead to water loss but is generally not continuous.

Observing Soil Dampness, Cracks, and Water Levels

Soil Dampness and Cracks in pool

To spot a potential pool leak, pay attention to the following:

  • Wet Soil: If the ground around your swimming pool is consistently damp, it may indicate an underground pool plumbing issue.
  • Cracks in the Deck: Cracks in your pool deck can be a sign of shifting soil due to pool leaks.
  • Dropping Water Levels: Keep a close eye on your pool’s water level. A significant and unexplained drop suggests a pool is leaking.

The Financial and Structural Implications of Undetected Leaks

Ignoring pool leaks can have severe consequences, including:

  • Structural Damage: Pool leaks can erode the soil beneath your pool shell, leading to structural problems.
  • Plumbing Line Damage: Over time, pool leaks can damage the pool’s plumbing lines, necessitating costly pool repairs.
  • Higher Water Bills: Unfixed pool leaks result in continuous water loss and increased utility bills.

By recognizing these signs early, you can prevent further damage and save on pool repair costs.

Common Causes and Locations of Pool Leaks

Understanding the common causes and locations of pool leaks is crucial for effective detection and repair.

Deterioration of Sealants and Pool Equipment

Over time, sealants and pool equipment can deteriorate, leading to pool leaks. These components include:

  • Pool Liner: Tears or wear in vinyl pool liners can result in water seepage.
  • Seals and Fittings: Seals around pipe fittings and PVC pipes can degrade, causing pool leaks.
  • Pool Lights: Pool lights can develop cracks, allowing water to enter.
  • Skimmer: The skimmer is a common source of pool leaks, especially if the gaskets or seals are damaged.

Skimmer Leaks, Pool Liner Leaks, Pool Light Leaks, and Plumbing Leaks

  • Skimmer Leaks: Inspect the skimmer for cracked or damaged gaskets. Replacing these gaskets may solve the issue. Also, check the skimmer line for any potential issues.
  • Pool Liner Leaks: Examine your pool liner for tears or holes. Small tears can often be patched with a vinyl patch kit. If you notice water seeping through, it might be a sign of concrete pool leaks.
  • Pool Light Leaks: If you suspect a pool light leak, consider replacing the pool light fixture or its seals. Ensure the pool equipment around the light is intact.
  • Plumbing Leaks: Pool plumbing leaks can occur at various points. Inspect the connections, PVC pipes, and pipe fittings for any signs of water. Pool pumps and pool filters are common areas to check.

The Rare Occurrence of Underground Pipe Leaks

While less common, underground pool pipe leaks can happen. If you suspect an underground pool plumbing leak, it’s advisable to consult a pool repair team or pool professionals experienced in pool plumbing.

DIY Leak Detection Methods

Before you tackle the repair, you’ll need to pinpoint the location of the leak. Here are some DIY leak detection methods:

Bucket Test

Bucket Test swimming pool

The bucket test helps you differentiate between evaporation and actual leaks.

  1. Materials Needed: A bucket, a piece of tape, and a waterproof marker.
  2. Steps:
    1. Fill a bucket with pool water, leaving a few inches at the top.
    1. Place the bucket on the pool step or another stable spot where it won’t tip over.
    1. Mark the water level inside the bucket with the marker.
    1. Mark the pool water level on the outside of the bucket using the tape.
    1. Wait 24 hours and compare the water levels. If the pool water level has dropped more than the bucket’s, you likely have a leak.

Dye Test

The dye test helps pinpoint the exact location of suspected leaks.

  1. Materials Needed: Food coloring or a leak-detection dye kit.
  2. Steps:
    1. With the pool pump off, wait until the water is calm.
    1. Add dye or food coloring near suspected leak areas.
    1. Observe the water closely; if the dye is drawn towards a particular area, it indicates a potential leak location.

Observing Water Loss Patterns and Using Listening Devices

Sometimes, you can observe patterns in water loss that point to the source of the leak. Additionally, using a listening device, such as a stethoscope or a professional leak detection tool, can help pinpoint leaks by listening for the sound of escaping water.

By following these DIY methods, you can narrow down the location of the pool pipe leak, making the repair process more efficient.

Advanced Leak Detection and Professional Help

The Importance of Specialized Equipment and Training

Detecting and repairing pool pipe leaks under concrete can be challenging. Pool professionals are equipped with specialized tools and training to handle these situations effectively. They have the knowledge to differentiate between various types of leaks, such as concrete pool leaks, pool pump leaks, and pool heater leaks.

Electronic Leak Finders and Pressure Testing

Pool professionals often use electronic leak detection equipment to precisely locate pool leaks. These devices can identify leaks in concrete pools, PVC pipes, and other pool equipment. Pressure testing is another method where the pool system is pressure tested to detect leaks. These advanced techniques help pinpoint the leak’s exact location.

When to Consider Seeking Professional Assistance

You should consider seeking professional assistance in the following situations:

  • Complex Leaks: If you have a complex leak that involves multiple components or underground plumbing, it’s best to hire a professional.
  • Structural Issues: If the leak has caused structural damage to your pool, a professional can assess and repair the damage effectively.
  • Liner or Pool Light Replacement: Replacing a pool liner or pool light often requires professional expertise to ensure a watertight seal.
  • Safety Concerns: If you encounter electrical or safety concerns while addressing the leak, it’s crucial to consult a professional for your safety.

Now, let’s explore the options for addressing the leak, whether you choose to DIY or hire a professional.

When to Consider Seeking Professional Assistance

You should consider seeking professional assistance in the following situations:

  • Complex Leaks: If you have a complex leak that involves multiple components, pool equipment, or underground pool plumbing, it’s best to hire a pool repair team.
  • Structural Issues: If the leak has caused structural damage to your concrete pool, a pool professional can assess and repair the damage effectively.
  • Liner or Pool Light Replacement: Replacing a pool liner or addressing pool heater leaks often requires professional expertise to ensure a watertight seal.
  • Safety Concerns: If you encounter electrical or safety concerns while addressing the leak, especially around the pool pump or pool heater, it’s crucial to consult a pool professional for your safety.

Addressing the Leak: DIY vs. Professional Repairs

Simple Repairs Using Pool Putty, Waterproof Silicone, Vinyl Patches, or Plaster Patches

If you have identified a minor leak or small damage, you can attempt DIY repairs. Here are some common materials and steps:

  • Pool Putty: Pool putty is a versatile and waterproof repair material. Clean the area around the leak, apply the putty, and smooth it out.
  • Waterproof Silicone: Silicone sealants are useful for small cracks or gaps. Ensure the area is clean and dry before applying silicone.
  • Vinyl Patches: For vinyl pool liners, use a vinyl patch kit. Clean and dry the damaged area, apply the adhesive, and place the patch.
  • Plaster Patches: If you have a concrete pool with plaster damage, patch it with a pool plaster repair kit. Follow the kit’s instructions for the best results.

Complex Repairs Requiring Deck Cutting, Major Renovations, or Liner Replacements

For larger or structural repairs, or if you’re unsure about your DIY skills, it’s advisable to consult a pool repair team. These repairs may involve:

  • Deck Cutting: In some cases, professionals may need to cut into your pool deck to access pool plumbing lines or make repairs. This should be done carefully to maintain the pool wall’s structural integrity.
  • Major Renovations: Extensive pool leaks or structural damage may require major renovations, which pool professionals are equipped to handle.
  • Liner Replacements: Replacing a pool liner or addressing pool leaks around pool equipment is a specialized task that pool professionals are well-suited for.

The Potential Need for Specialized Tools and Kits

In both DIY and professional repairs, you may require specialized tools and kits. These can include:

  • Leak Detection Kits: DIY kits are available for detecting and temporarily sealing leaks.
  • Deck Repair Tools: If deck cutting is necessary, professionals will use specialized tools to ensure a clean and precise cut.

Remember, your choice between DIY and professional repair should depend on the complexity of the leak and your comfort level with the repair process.

Costs and Considerations

Average Costs of Leak Detection and Repair

Before you embark on fixing a pool pipe leak under concrete, it’s essential to consider the costs involved. The expenses can vary based on the complexity of the leak and whether you opt for DIY or professional services. On average:

  • DIY Repairs: DIY materials like pool putty or vinyl patches are relatively inexpensive, usually ranging from $10 to $50. Electronic leak detection kits can cost between $50 and $500.
  • Professional Services: Hiring a professional for leak detection and repair can cost anywhere from $300 to $1,500 or more, depending on the severity of the leak and the extent of repairs needed.

Weighing the Pros and Cons of DIY vs. Professional Services

DIY Pros:

  • Cost-Effective: DIY repairs can save you money for minor leaks.
  • Learning Experience: You’ll gain valuable knowledge about your pool’s plumbing system.
  • Immediate Action: You can address minor issues promptly.

DIY Cons:

  • Limited Expertise: You may lack the skills to tackle complex leaks.
  • Risk of Mistakes: Incorrect repairs can lead to more significant problems.
  • Time-Consuming: DIY repairs may take longer if you’re unfamiliar with the process.

Professional Pros:

  • Expertise: Professionals have the knowledge and equipment for accurate diagnosis.
  • Efficiency: They can complete repairs efficiently, minimizing downtime.
  • Warranty: Many professionals offer warranties on their work.

Professional Cons:

  • Cost: Professional services can be more expensive.
  • Scheduling: You may need to wait for an available appointment.
  • Dependence: You rely on others for the repair process.

Long-Term Benefits of Timely Repairs

It’s crucial to consider the long-term benefits of addressing pool pipe leaks promptly:

  • Preserve Your Investment: Timely repairs protect your pool and prevent costly structural damage.
  • Extend Lifespan: Regular maintenance and early repairs can extend your pool’s lifespan.
  • Water Conservation: Fixing leaks conserves water and reduces water bills.
  • Safety: Maintaining a leak-free pool ensures a safe environment for swimmers.
  • Peace of Mind: Knowing your pool is in good condition provides peace of mind.


In conclusion, fixing a pool pipe leak under concrete is a task that can range from DIY repairs for minor issues to professional assistance for complex leaks. Regardless of your choice, regular pool maintenance and vigilant monitoring are key to a leak-free and enjoyable swimming experience.

Emphasizing the Importance of Regular Pool Maintenance

Regular pool maintenance, including checking for leaks and monitoring water levels, is essential to keep your pool in optimal condition. Make it a habit to inspect your pool for any signs of leaks, especially during the swimming season.

The Value of Early Detection and the Risks of Neglect

We cannot stress enough the value of early leak detection and swift action. Neglecting a pool pipe leak can lead to significant structural damage, increased water bills, and compromised water quality. Being proactive in addressing pool issues is the best approach.

Encouraging Pool Owners to Stay Informed and Proactive

As a responsible pool owner, staying informed about pool maintenance and repair is vital. Continue learning and seeking guidance to ensure your pool remains a source of relaxation and enjoyment for years to come.

Remember, whether you choose to DIY or enlist professional help, the goal is the same: a leak-free, safe, and enjoyable pool for you and your family to relish.