How To Fix An Unlevel Inground Pool – Restoring Structural Balance
Finding out that your pool is no longer level can be a sinking feeling for any homeowner or homesteader. It is a common issue that often stems from soil shifts, poor drainage, or natural settling over time. If you notice a lopsided waterline, it is time to act before structural damage becomes permanent.
In this guide, we will walk you through the essential steps and professional techniques used to restore your pool’s balance. We will cover how to diagnose the root cause, the tools you need for an accurate assessment, and the most effective repair methods available today. By the end of this article, you will know exactly how to fix an unlevel inground pool to ensure your outdoor oasis remains safe and beautiful.
Whether you are managing a self-sufficient homestead or a modern suburban retreat, maintaining your infrastructure is key to long-term value. Fixing a sinking pool requires a blend of patience, the right equipment, and an understanding of the ground beneath your feet. Let’s dive into the details and get your pool back on the level.
Understanding Why Your Inground Pool Is Sinking
Before you can begin any repairs, you must understand why the shift occurred in the first place. Most inground pools settle slightly over the first few years, but significant tilting usually points to a deeper issue. Soil composition plays a massive role, especially in areas with expansive clay or loose sandy loam.
Water management is often the primary culprit behind an unlevel pool shell. If your gutter system or landscape grading directs rainwater toward the pool, the soil underneath can become saturated and lose its load-bearing capacity. This process, known as soil erosion, can create voids that allow the heavy pool structure to dip.
Leaking pipes or a compromised pool liner can also cause localized sinking. Even a pinhole leak can wash away the supporting dirt over several months. Identifying these environmental factors is the first step in ensuring that once you level the pool, it stays that way for the long haul.
how to fix an unlevel inground pool
When you are ready to tackle the problem, the most common and effective method involves a process called pressure grouting or slab jacking. This technique involves injecting a stabilizing material beneath the pool shell to lift it back to its original position. It is a precise operation that requires specialized equipment but avoids the need for a full pool replacement.
The first stage of this process is to drain the pool partially to reduce the weight, though some professionals prefer to keep some water for ballast. You will then drill small, strategic holes through the pool floor or the surrounding deck. These holes serve as injection points for the leveling material, which fills the voids and provides upward lift.
Once the material is injected, it expands or hardens, slowly raising the low side of the pool. Constant monitoring with a laser level is required during this phase to ensure the lift is even. After the pool is level, the injection holes are patched with matching plaster or concrete, making the repair nearly invisible to the naked eye.
Assessing the Degree of the Slope
You cannot fix what you haven’t measured, so start by determining exactly how far out of level the pool has become. The easiest way to do this is by measuring from the top of the coping down to the waterline at various points around the perimeter. Use a standard tape measure and record the numbers at every four feet.
For a more professional assessment, use a transit level or a water level. A transit level allows you to establish a benchmark height and compare all corners of the pool to that single point. If the difference between the highest and lowest points is less than an inch, it may be a cosmetic issue; anything more requires structural intervention.
Check the surrounding pool deck as well. If the deck is pulling away from the pool wall or showing large cracks, the entire “vessel” and its surround are likely moving together. This indicates a broader soil stability issue that might require helical piers for a permanent fix.
The Role of Polyurethane Foam Injection
Modern pool repair often utilizes high-density polyurethane foam instead of traditional concrete slurry. This material is lightweight, which means it doesn’t add significant weight to the already failing soil. It is also waterproof, meaning it won’t wash away if the original drainage issue persists.
The foam is injected as a liquid and undergoes a chemical reaction that causes it to expand rapidly. This expansion provides the force necessary to lift the heavy concrete or fiberglass shell. Because the foam reaches its full strength within minutes, the pool can often be refilled and used much sooner than with other methods.
One of the biggest advantages of foam is its ability to seek out even the smallest voids. It creates a solid, stable base that encapsulates the soil and prevents future erosion. For many homeowners, this is the preferred method for how to fix an unlevel inground pool due to its speed and durability.
Essential Tools for Measuring and Leveling
If you are a DIY enthusiast or a homesteader who prefers to handle repairs personally, you will need a specific kit. While the actual lifting often requires a pro, the diagnosis and monitoring can be done with the right gear. A rotary laser level is the gold standard for getting an accurate reading across a large surface like a pool.
You will also need a string level and high-tension mason’s line to check the “square” and level of the pool’s coping. For checking the plumbing lines—which often break when a pool shifts—a pressure testing kit is essential. If the pool is unlevel, there is a high chance the underground PVC pipes have been stressed or cracked.
Do not forget safety gear, including heavy-duty gloves, eye protection, and sturdy boots. Working around heavy structures and pressurized injection systems carries risks. Having a submersible pump on hand is also useful if you need to quickly adjust water levels during the leveling process.
- Laser Level: For precise elevation measurements across the pool surface.
- Pressure Testing Kit: To ensure plumbing hasn’t snapped during the shift.
- Submersible Pump: For managing water weight during the lifting phase.
- Measuring Tape: To track the waterline-to-coping distance.
Comparing Mudjacking vs. Foam Injection
When researching how to fix an unlevel inground pool, you will likely encounter two main terms: mudjacking and foam injection. Mudjacking is the traditional method, using a mixture of water, dirt, and Portland cement. It is generally cheaper than foam but comes with the downside of being extremely heavy.
The weight of the “mud” can sometimes cause further settling if the underlying soil is particularly soft. However, for large voids where a massive amount of filler is needed, mudjacking can be more cost-effective. It provides a very rigid, stone-like base once it fully cures over several days.
Polyurethane injection, as mentioned earlier, is the more modern approach. It requires smaller injection holes (usually about the size of a penny), which is a major plus for aesthetic reasons. While the material cost is higher, the labor is often faster, and the long-term stability is generally superior in wet environments.
- Identify the low spots: Use a level to mark the areas requiring lift.
- Drill injection ports: Create access points through the concrete or shell.
- Inject material: Slowly pump foam or slurry until the shell rises.
- Monitor the lift: Use a laser level to stop at the exact benchmark.
- Seal and patch: Fill the holes and repair any surface cracks.
The Importance of Soil Stabilization and Drainage
Fixing the level of the pool is only half the battle; you must also fix the environment that caused the failure. If you don’t address the hydrostatic pressure or poor drainage, the pool will simply sink again. Start by inspecting your landscape grading to ensure water flows away from the pool area.
Installing a French drain around the perimeter of the pool deck can be a game-changer. This system collects subsurface water and funnels it to a safe discharge point, keeping the soil beneath the pool dry and stable. For homesteaders with sloped land, this is often a mandatory step in pool maintenance.
You might also consider soil stabilization injections around the pool’s exterior. These chemical grouts bond the soil particles together, creating a moisture-resistant “curtain” that prevents erosion. Think of it as an invisible retaining wall that protects your pool’s structural integrity from the inside out.
When to Call a Professional Engineer
While we love a good DIY project, some pool leveling issues are beyond the scope of a weekend warrior. If you see cracks in the pool shell that are wide enough to fit a coin into, you may have a structural failure. In this case, a structural engineer should evaluate the site before any lifting is attempted.
Lifting a pool shell that is structurally compromised can cause it to snap in half. A professional will use specialized sensors to detect the density of the soil and determine if piering is necessary. Piers are long steel rods driven deep into the earth until they hit bedrock, providing a permanent “stilt” for the pool.
If your pool is fiberglass, the process is slightly different and often requires a professional who understands the flexibility of the material. Attempting to lift fiberglass without proper support can lead to “spider cracks” in the gel coat or a complete blowout of the walls. Always prioritize safety and structural longevity over a quick fix.
Preventing Future Leveling Issues
Once you have mastered how to fix an unlevel inground pool, you never want to do it again. Prevention starts with regular inspections of your pool’s expansion joints. These joints are filled with a flexible sealant that prevents water from seeping between the deck and the pool wall; if they crack, replace them immediately.
Keep an eye on your water bill and your pool’s water level. An unexplained drop in water often indicates a leak that could be eroding your pool’s foundation. Early detection of a leak can save you thousands of dollars in leveling costs down the road.
Finally, maintain your landscaping. Large trees planted too close to the pool can have roots that lift the structure or drink so much water that the soil shrinks and settles. Keep a “clear zone” around your pool to ensure the ground remains as stable as the day the pool was installed.
Frequently Asked Questions About Fixing Unlevel Pools
Can I level an inground pool without draining it?
In many cases, yes. Professionals often prefer to keep some water in the pool to provide weight and stability during the injection process. However, if the sink is severe, partial draining may be necessary to protect the shell from cracking under the pressure of the lift.
How much does it cost to fix an unlevel pool?
The cost varies significantly based on the method used. Mudjacking might cost between $2,000 and $5,000, while polyurethane foam injection often ranges from $3,000 to $7,000. If structural piers are required, the cost can exceed $10,000, making early diagnosis very important.
Is a slightly unlevel pool dangerous?
A pool that is out of level by an inch or less is usually a cosmetic issue. However, significant tilting puts uneven stress on the pool walls and can lead to structural cracks. It also affects the efficiency of the skimmer, which requires a specific water level to remove debris effectively.
How long does the leveling process take?
Most professional foam injection or mudjacking jobs can be completed in a single day. The pool is often ready for use within 24 to 48 hours, depending on the type of patching material used for the injection holes. It is a much faster alternative to rebuilding the pool.
Will my homeowners insurance cover a sinking pool?
Generally, homeowners insurance does not cover “earth movement” or “settling,” which are the most common causes of an unlevel pool. However, if the sinking was caused by a sudden pipe burst that is covered under your policy, you might have a claim. Always check your specific policy details.
Conclusion: Restoring Your Outdoor Sanctuary
Understanding how to fix an unlevel inground pool is about more than just aesthetics; it is about protecting one of your home’s most significant investments. By identifying the signs of sinking early and addressing the underlying soil and drainage issues, you can prevent a minor tilt from becoming a major catastrophe.
Whether you choose the traditional strength of mudjacking or the modern efficiency of polyurethane foam, the goal is a stable, level surface where your family can swim safely. Remember to always measure accurately, consult with experts when structural cracks appear, and keep your drainage systems clear.
Taking care of your outdoor space is a rewarding part of the adventurous, self-reliant lifestyle. With a level pool and a solid foundation, you can get back to enjoying those summer afternoons with total peace of mind. Stay proactive, keep your gear ready, and enjoy your perfectly balanced backyard retreat!
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