Below is a list of Jet Pump manufacturers from Lancaster, Pennsylvania. A jet pump is a centrifugal pump that increases water pressure in shallow and deep wells by converting the mechanical energy of an impeller into kinetic energy. Jet pumps are the most common pump for shallow wells and are mounted above or outside of the well itself. The weight of the air (atmospheric pressure) determines the height that water can be lifted. The limit is usually around 25 feet. However, jet pumps can be effective for deep wells if the jet is separated from the motor and placed down in the water.