If you are planning to install an above ground pool at your home, the ground must be level. If it is not level, it can cause numerous issues with the base of the pool as well as for the liner and the water levels. It isn’t fun to have a pool with water spilling over one end due to high water levels, while the other end is very shallow. It is not only an inconvenience, but it is also unsafe and can cause damage to the pool.