Introduction
Thinking of installing an above-ground pool? One of the most important—and often overlooked—steps is making sure the ground is perfectly level. This guide will walk you through how to level the ground for an above-ground pool step by step. A solid, even base ensures your pool is safe, stable, and long-lasting. Skip this step, and you’ll risk sagging, leaks, or worse.
Why Leveling the Ground Matters for Your Pool
An uneven base can lead to serious issues over time. Even a slight slope can cause:
- Uneven water distribution
- Extra stress on pool walls and seams
- Risk of structural failure or collapse
- Wasted water and higher maintenance
Proper leveling protects your investment and ensures a smooth installation. It’s especially important for soft-sided or inflatable pools, which rely entirely on the ground beneath them for support.
Step-by-Step Guide to Leveling the Ground for an Above-Ground Pool
Step 1: Choose the Right Location
Start by picking a flat, open area free of trees, roots, and underground utilities.
- Choose a spot that gets plenty of sun and is clear of overhead power lines.
- Avoid areas with poor drainage or steep slopes.
Tip: Use a ground marking paint or rope to outline the pool’s size, plus a little extra space for walking around.
Step 2: Remove Grass, Sod, and Debris
Using a shovel, sod cutter, or rototiller, clear the entire area down to bare soil.
- Remove grass roots completely to prevent regrowth under the liner.
- Pick up rocks, roots, sticks, or anything else that could cause bumps or tears.
Pool Owner Tip: Don’t just dump sand over grass—it can shift over time and lead to an unlevel pool.
Step 3: Find the Lowest Point
You need to level down to the lowest point, not build up the high spots.
- Place a long straight board (e.g., 2×4) across the ground with a carpenter’s level on top.
- Rotate it around the area and mark any high or low spots with spray paint or stakes.
Caution: Never try to level a pool by piling up soil or sand under one side—it will shift and collapse over time.
Step 4: Dig and Flatten High Areas
Use a shovel, hoe, or landscaping rake to remove soil from high spots.
- Continually check with your level and board.
- For large areas, consider renting a mini excavator or plate compactor.
Tip: Work slowly and methodically—precision here prevents problems later.
Step 5: Compact the Soil
Once the area is level, compact the soil to create a firm, stable base.
- Use a hand tamper or rent a mechanical plate compactor.
- Compact in multiple passes and in all directions.
Bonus Hack: Lightly mist the soil with water as you compact—it helps bind particles together.
Step 6: Add a Layer of Sand or Base Material
Spread 1–2 inches of mason sand or crushed stone dust over the compacted soil.
- Use a rake to spread it evenly, then compact it again.
- The sand provides a soft layer that protects your liner and makes leveling easier.
Optional Upgrade: Consider using pool patio blocks or foam base pads under the wall supports for extra stability.
Step 7: Double-Check for Level
Use your level and board to scan the entire surface.
- The entire area should be level within 1 inch across the whole diameter.
- Re-adjust and re-compact as needed.
Pool Owner Tip: Walk the area and feel for soft spots or dips. Fix them before moving forward.
Step 8: Install a Ground Cloth or Liner Pad
Before setting up the pool, roll out a ground cloth or liner pad.
- This helps prevent punctures and adds a layer of insulation between the pool and ground.
- Smooth out wrinkles and secure it with weights or temporary stakes.
Common Mistakes to Avoid
1. Leveling Up Instead of Digging Down
Never try to build up one side of a slope with sand or soil. Dig everything down to the lowest point for true stability.
2. Not Compacting the Base Properly
Loose soil settles unevenly, especially once filled with water. Compact everything thoroughly.
3. Leaving Grass Under the Pool
Grass and roots can grow and decay under your pool, causing voids or damaging the liner.
4. Skipping the Final Level Check
Eyeballing isn’t good enough. Use a level across the full surface—one small dip can lead to major problems.
5. Rushing the Process
Leveling takes time and effort. Take the extra day now to avoid major headaches later.
Extra Tips & Pool Hacks
1. Use a Laser Level for Accuracy
A laser transit level can make large-area leveling easier and more precise—especially helpful for oval or rectangular pools.
2. Mark a Center Point with a Stake and String
Attach a string to the center stake and rotate it like a compass to keep the shape perfect and measure leveling all the way around.
3. Add Landscaping Fabric Under Sand
Lay landscape fabric between the soil and sand layer to prevent weeds and further erosion.
Bonus Link:
Installing a pump after setup? [Check out our guide on how to install an above-ground pool pump.]
Conclusion
Leveling the ground for your above-ground pool is the most important step in your pool setup. Take your time, follow these steps carefully, and you’ll create a stable, long-lasting foundation for years of safe swimming.
Final Tip: Bookmark this guide so you can reference it every time you install or reset your pool!