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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.

Yard grading is a key component of proper drainage because runoff naturally moves with respect to gravity. If you have low spots in your yard, rain and snowmelt will settle there and oversaturate the soil, promoting root rot and fungal growth. If the low spots are near your home’s foundation, you could even end up with foundation leaks or structural damage due to poor yard grading.

Yes, most landscapers should be able to install French drains. However, it’s best to hire a French drain installation company that specializes in this type of project. You may want to get multiple quotes from landscaping companies to get an idea of the average installation cost before hiring a professional to install a French drain system for you.