Abstract: A water pump low pressure cutoff switch comprising a cylindrical housing incorporating an upper water chamber and a lower dry chamber. The water chamber is connected to a water line adjacent the pump, and is formed by a movable circular plate having a sealing means and a centered bypass button post on its top surface. The bottom surface of the movable plate has a pair of cylindrical electrical contacts with flat faces. A fixed plate creating the dry chamber has matching aligned electrical contacts which move apart to break the circuit when a calibrated compression coil spring affixed between the plates expands when a predetermined lower water pressure is met.