A well pump is an electromechanical piece of equipment that gets installed after drilling or digging a well. Its purpose is to pump the water from your well into your house. Using centrifugal force, a well pump shoots water from its underground reservoir up to your home for use. The depth at which your well sits will determine which style of well pump you'll need. An electric motor drives an impeller or centrifugal pump, which pushes water from your well through a jet or pipe. In this article, you'll learn about how to choose well pumps.