How to Level a Pool After Its Been Filled: Expert Guide

When you fill a new pool for the first time, it feels like the hardest part is over. You imagine relaxing by the water, not worrying about the ground beneath. But sometimes, after a pool is filled, you notice that the waterline is uneven.

Maybe one side looks lower, or the skimmer is not working well. A pool that’s not level can cause real problems—damage to the pool structure, poor filtration, or even safety risks. Fixing this issue may sound impossible, especially with thousands of gallons of water already inside.

But it can be done. With the right approach, patience, and a bit of hard work, you can level a pool after it’s been filled.

This guide will walk you through everything you need to know about leveling a filled pool. You’ll learn how to identify if your pool is truly unlevel, understand the risks, and see practical step-by-step instructions for correcting the problem. Whether you have an above-ground pool or an inground one, you’ll find clear advice, warnings about common mistakes, and real-world examples. If you care about your pool’s safety and want to avoid expensive repairs, read on—you’ll get the knowledge and confidence to tackle this challenge.

Why Pool Level Matters

The level of your pool is not just about looks. When a pool is unlevel, even by a small amount, it can lead to:

• Uneven water pressure on pool walls, which may cause them to bend or collapse (especially in above-ground pools)
• Malfunctioning skimmers and poor circulation, leading to dirty water and extra chemical use
• Liner stress and wrinkling, which may cause leaks
• Increased risk of tripping or slipping accidents around the pool deck

For example, a pool that’s only 2 inches off-level can put twice as much pressure on one side. Over time, this can create cracks or bulges. Fixing these problems after they appear is much harder (and more costly) than correcting the level early.

How To Check If Your Pool Is Unlevel

Before you start any repairs, you need to know how much your pool is off-level. Here’s how to do it:

Visual Inspection

Stand at different points around the pool and look at the waterline compared to the edge. If you see more than a half-inch difference, that’s a warning.

Use A Tape Measure

Measure the distance from the top of the pool wall to the water surface at several points. Write down the numbers. If the difference is more than 1 inch, you’ll want to take action.

Use A Water Level

A simple water level is a long, clear hose filled with water. Place one end at one side of the pool and the other at the opposite edge. The water in the tube will always stay level, so you can compare the heights easily.

This method is very accurate, even for large pools.

Laser Levels And Digital Tools

For higher accuracy, use a laser level or a digital level. These tools can quickly show you if the pool is sloping and by how much.

Example Table: Visual Vs. Measured Level

If you see a difference greater than 1 inch, it’s time to fix the problem. More than 2 inches is urgent.

Is It Safe To Level A Pool After Filling?

Many pool owners worry about damaging their pool or making things worse. The good news is: yes, it is possible to level a pool after it’s filled, but it requires care.

• Above-ground pools: More flexible, can often be adjusted without complete draining.
• Inground pools: Usually need some water removed, and sometimes professional help.

It’s important to know your pool type and construction before starting. Never try to lift or shift a pool full of water without understanding the risks.

Preparing To Level A Filled Pool

Before you start work, some preparation is essential:

Gather Tools And Materials

Depending on your pool, you may need:

• Long spirit level or water level hose
• Shovels and spades
• Sand or crushed stone for under the pool
• Heavy-duty jacks (for above-ground pools only)
• Garden hose for draining or refilling
• Wheelbarrow and tamping tool
• Replacement blocks or pavers (for pool legs or supports)
• Work gloves and safety glasses

Decide: Partial Or Full Drain?

In most cases, partial draining is enough. Removing just enough water to reduce pressure (usually to 1/3 or 1/2 full) makes the pool safer to adjust.

Never try to move an above-ground pool with all the water inside—it can cause the wall to buckle or tear.

Check The Ground

Look for signs of:

• Erosion or washed-out areas under the pool
• Settling of pavers, blocks, or supports
• Tree roots or rocks pressing up from below

Fixing the cause will prevent the pool from becoming unlevel again.

Step-by-step Guide: Leveling An Above-ground Pool After Filling

Above-ground pools are the most common to go off-level. Here’s a detailed process to fix them without starting from scratch.

1. Lower The Water Level

• Use a submersible pump or siphon to reduce the water until it’s just below the area you need to lift or adjust.
• For small corrections (less than 1 inch), you may not need to drain much.
• For larger adjustments (over 2 inches), lower to 1/3 full or less.

2. Identify The Low Side

• Walk around the pool and measure from the top rail to the ground at several points.
• Mark the lowest point with tape or chalk.

3. Carefully Loosen The Pool Wall

• Remove the top rails and caps near the low area.
• Gently pull back the liner if possible, or loosen it so it won’t tear.
• Check the support legs and base plates.

4. Lift And Support The Pool Wall

• Use a car jack or bottle jack under the bottom rail (with a block of wood to spread the weight).
• Lift slowly—no more than 1/2 inch at a time.
• Insert crushed stone, sand, or a new patio block under the bottom rail to raise the low spot.
• Use a level to check your progress.

5. Tamp And Compact The Base

• After raising, tamp down the new material so it’s firm.
• Double-check the level from several angles.
• Add more fill if needed, then re-tamp.

6. Reassemble And Refill

• Replace the liner, making sure there are no wrinkles.
• Reattach the top rails and caps.
• Slowly refill the pool, checking the level often.

7. Final Checks

• Once filled, measure at four points to confirm the pool is level.
• Watch for new settling over the first week.

Example Table: Pool Level Correction Steps

Step-by-step Guide: Leveling An Inground Pool After Filling

Leveling an inground pool is more complex and may require professional help. But you can still correct minor issues yourself.

1. Assess The Problem

• Is the concrete deck unlevel, or is the whole pool shell out of alignment?
• Small differences (less than 1 inch) can sometimes be fixed by adjusting the deck or coping.

2. Lower The Water Level

• Drain enough water to reduce pressure, especially if you need to work on the structure.
• For large pools, drain to at least below the skimmer.

3. Fix The Deck Or Coping

• For concrete decks, use self-leveling compound to even out the surface.
• For pavers or bricks, lift and add sand or gravel underneath, then reset.

4. Address Structural Problems

• If the pool shell has shifted, you’ll need a pool contractor.
• Sometimes, the soil settles or erodes, causing the pool to tilt.
• A professional can jack up the pool shell and inject grout or foam underneath.

5. Refill And Monitor

• Refill the pool slowly, checking for any new movement.
• Watch for cracks or leaks over the next few days.

Key Insight For Inground Pools

• Never drain a vinyl or fiberglass pool completely—the walls can collapse or float out of the ground if the groundwater is high.
• Always check local water tables and weather before starting.

Credit: www.leaktools.com

Common Mistakes To Avoid

Many homeowners make the same errors when trying to level a pool. Avoid these to save time, money, and stress.

• Trying to lift a full pool. Never jack up or shift a pool with all the water inside. The pressure is too high and can cause serious damage.
• Ignoring the cause. Fix the underlying problem—such as eroded soil, improper base, or tree roots—otherwise, the pool will become unlevel again.
• Using the wrong materials. Only use sand, crushed stone, or patio blocks designed for pool support. Soft dirt will settle again.
• Not checking the level in multiple places. Always measure at four or more points around the pool.
• Rushing the process. Take your time lifting, filling, and tamping. Quick fixes often fail within a season.
• Not protecting the liner. Always loosen or remove the liner before lifting the pool wall to prevent tears.
• Skipping safety gear. Wear gloves and safety glasses, especially when using jacks or moving heavy materials.
• Not consulting an expert for big problems. Large shifts, cracks, or leaks need professional attention.

How Much Off-level Is Acceptable?

Most experts agree:

• Less than 1 inch difference: Usually safe, but fix if you see problems.
• 1 to 2 inches: Needs correction, especially for above-ground pools.
• Over 2 inches: Unsafe; must be corrected before using the pool.

Manufacturers often void warranties if the pool is more than 1 inch out of level.

Credit: www.amazon.com

Comparing Diy Vs. Professional Leveling

Some pool owners can fix minor problems themselves. Others need a pro. Here’s a side-by-side comparison:

What To Do After Leveling Your Pool

Once your pool is level, a few steps will help keep it that way:

• Check the level every month during the first season.
• Inspect the ground after heavy rain—look for erosion or washouts.
• Keep heavy items away from the pool edge (furniture, planters).
• Add a layer of mulch or gravel around above-ground pools to prevent washouts.
• Maintain proper water chemistry—imbalanced water can weaken liners and concrete.

Credit: www.eenews.net

Advanced Tips And Non-obvious Insights

Many guides miss these key details:

• Monitor during filling: The best time to check for level is as you fill the pool. Stop and measure every few inches. Fixing a problem early is much easier than after the pool is full.
• Use foam pads for small adjustments: For above-ground pools, thin foam sheets (like gym mats) can be used under the liner for small (1/4 inch or less) corrections. They also protect the liner from rocks.
• Check for underground water: Pools on high water tables or clay soil are more likely to shift. Installing a French drain or sump pump near the pool can prevent future movement.
• Document your fixes: Take photos and notes about what you adjusted. This helps if you need warranty service or sell your home.
• Know when to call a pro: If you see cracks, leaks, or the pool moves after heavy rain, don’t wait—contact a pool specialist.

When To Rebuild Vs. Repair

Sometimes, a pool is so unlevel that repair is not enough. Here are signs you may need to rebuild:

• The pool is more than 3 inches off-level anywhere
• The wall is buckled, torn, or shows cracks
• The liner is ripped or pulling away from the wall
• The ground underneath is soft, muddy, or eroded

In these cases, it’s safer (and sometimes cheaper) to take the pool down and rebuild from the ground up.

Real-world Example: Above-ground Pool Leveling

Tom, a homeowner in Texas, noticed his pool was 2 inches lower on one side after heavy rain. He drained the pool to half, jacked up the low side with a car jack (using a block of wood), and added crushed granite under the rail.

After tamping it down, he checked with a water level, then refilled the pool. The waterline is now perfectly level, and the pool has stayed that way for three years.

Cost And Time Estimates

• DIY, minor fix: $100-$300, 1-2 days
• DIY, major fix: $300-$800, 2-4 days
• Professional repair: $500-$3000+, 1-2 days

Extra costs may include new liner, replacement blocks, or soil stabilization.

Extra Resources

For more in-depth technical advice, check industry standards and safety tips from the Wikipedia Swimming Pool page. This covers pool construction, maintenance, and troubleshooting.

Frequently Asked Questions

How Much Can A Pool Be Off-level And Still Be Safe?

Most pool manufacturers recommend no more than 1 inch difference around the perimeter. Over 2 inches is considered unsafe and should be fixed before using the pool.

Can I Level My Pool Without Draining All The Water?

Yes, for most above-ground pools, you can partially drain (down to 1/3 or 1/2 full) and then make adjustments. Never try to lift or shift a pool that is completely full.

Will An Unlevel Pool Damage The Liner?

Yes, if a pool is out of level, the liner can stretch, wrinkle, or tear due to uneven pressure. This can lead to leaks and expensive repairs.

How Do I Prevent My Pool From Becoming Unlevel Again?

Maintain good drainage around the pool, check for erosion after storms, and support the base with sand or crushed stone. Regularly inspect for settling and fix small problems early.

When Should I Call A Professional?

If your pool is more than 2 inches off-level, or you see cracks, leaks, or shifting after repair, call a pool contractor. Inground pools with structural issues always need a pro.

Leveling a filled pool is a serious job, but it’s possible with the right tools, time, and care. By following these detailed steps, you can protect your investment and enjoy a safe, beautiful pool for many summers to come.