First, do you have the proper dehumidification system? Second, do you have a water alarm? A water alarm will warn you if there is water in your basement. They can last for several years if properly maintained. In addition, a pump helps prevent mold growth, which can damage walls and warp wood. Installation costs can vary, especially in regions that experience a lot of rainfall and humidity. For example, do you have a French drain? In addition to a sump pump, a French drain is a very useful water drainage system for your basement.