They are also easier to maintain. When you need to have your sump pump repaired or replaced, you should hire a professional. Installing A Sump Pump In A Dirt Floor: When installing a sump pump in a dirt floor, it is important to follow the manufacturer's instructions. Use a hole saw with a bit sized appropriately. Your pump should also have a float switch that detects when water accumulates in the pit. If you want to install a new sump pump, consider hiring a professional. Your pit should be at least 22 inches deep. Water damage can cause toxic mold growth, which can result in expensive repairs. It should sit flush with the floor, but not overly close to it. It's also available with pre-mounted alarm floats. Homeowners should also install a backup sump pump. Older homes might not have considered this option.