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Fixing a depression in your lawn is a DIY for small dips, divots, or slight slopes. You can either remove sod and earth to lower the uneven ground or add premixed topsoil and reseed the lawn to raise it. You can also hire a yard grading company near you for professional help.

If you notice small bumps on your lawn, you can flatten them by gently treading them down when the ground is wet. A lawn with larger lumps may need to be regraded by a professional to flatten it out and improve the overall drainage of the yard to prevent future lumps from forming.

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.