A leak in the home can cause this water well problem, so the well pump continuously runs. It can also be due to corrosion of the water well casing, liner, or screen, causing holes. Holes can allow water of undesirable quality to enter the well. Look for leaking toilet flush valves, reverse osmosis systems, iron filters, and other backwashing filter systems that may malfunction.
A common cause is a failed check valve. The check valve or foot valve prevents the well pressure tank from sending water back down into the well after it has built up with water pressure.
If the valve fails, water streams back down the well, and the pressure switch turns the pump on again. This on and off-cycle may occur every few minutes and essentially allow the well pump to run practically 24 hours a day, causing a high power bill. Replace the check valve, and the problem is solved.
Another very common issue is the pressure tank losing its captive air pressure. This is easy to check. Turn off power to the well pump and run water after the pressure tank or in the house until there is no water pressure left. Using a tire pressure gauge check the Schrader valve on top of the pressure tank. It should be 2 PSI less than the cut-in or lower pressure. If your well turns on at 30 and off at 50 PSI, it should have 28 PSI in it.
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