A well pump pressure switch regulates a home¡¯s water supply. Available from American Pump & Well Service & Repair, it is a small electrical control unit that senses the pressure in the well and switches a pump on and off. On a single-pump system, the switch operates the submersible pump. On a two-pump system, it operates the pressure pump.
When the water pressure in the well drops to a certain level, the switch senses that more water is needed. Spring-loaded electrical parts make contact; turning on the well pump. When the pressure returns to the preset level and the well tank is filled, the electrical contacts separate and the well pump shuts off.
Plain and simple, without a properly functioning well pump pressure switch, there is no water to drink, to do dishes or laundry and no water to flush.