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It depends on the model of your pool. You’ll always have to level the topsoil, but most vinyl-lined pools require an additional 1- to 2-inch layer of sand to protect the liner. This way, when a foot kicks down to the bottom of your pool, it’s not scraping the liner against the hard ground. If your pool isn’t vinyl-lined, you can skip this step or add a layer of another base material, like decomposed granite. Always check your manufacturer’s instructions before you begin.

An aboveground pool should be level within 1 inch—and it starts to become unsafe after a couple of inches. Any slope will lead to an uneven distribution of water, which will put pressure on your pool’s structure, wearing down the pool liner. In certain cases, it could cause your pool to collapse. Even if you’re within a safe window, you may still notice that the water level is uneven.

You should exercise care when deciding how to landscape over a leach field for your septic system. You typically want lightweight materials that won’t damage the drain field’s perforated pipes. When adding plants to the area, select plants with shallow roots, such as grass or flower gardens. Trees with deep roots could damage the pipes in the field.

When leveling the ground for a pool. If the ground is mostly level, you may be able to simply lay down pavers or pool pads to support the pool. However, you’ll still need to level the ground with sand as a base before adding other materials on top, like crushed gravel.