The average sump pump can last seven to ten years, but it's always a good idea to have it replaced when it begins to show its age. To combat this, it is a good idea to install a water backup sump pump. When replacing your sump pump, consider the number of years it will be used, the amount of water it will handle, and your area's moisture and flood risk. Also, if you have a sump pump, it is important that it is in good shape.