Well Pump Won't Shut Off
A well pump that keeps running points to a leak, tank, or switch.
Compiled by DIY Repair Guide · reviewed 2026-09-11 ·how we research these
When a well pump won't shut off, the system is failing to reach its designated cut-out pressure. A well pump running constantly is not a normal operating condition. In a typical private residential well system, the pump runs only when actively refilling the pressure tank or supplying open household taps. If the pump runs without stopping, the issue usually traces to one of three problems: an undetected water leak demanding continuous flow, a pressure tank that has lost its internal air cushion, or an electrical pressure switch that is failing or misadjusted. If your symptom is weak flow at the taps instead of a pump that never shuts off, see our guide to low water pressure in the house.
Leaving a pump running for hours can overheat the motor and cause severe mechanical wear. On an episode of the home-improvement podcast Around the House with Eric G, a customer story highlighted a homeowner whose well pump ran uninterrupted for six hours during a workday due to a hidden plumbing line leak. According to the Water Systems Council (WSC), an estimated 23 million households across the United States depend on private water wells, as reported by the Environmental Protection Agency (EPA). Identifying why a well pump keeps running protects both your water supply and your mechanical equipment. A basement sump pump runs on a separate system entirely, so if yours is a sump pump that is not working, the checks below do not apply.
How Water Pressure Controls the Pump
A private well system relies on a mechanical pressure switch and a pressurized storage tank to start and stop the pump automatically.
According to the wellcare® info sheets published by the Water Systems Council, water is pumped into a pressure tank to compress a volume of captive air. This compressed air cushion acts like a spring, pushing water through household pipes when the pump is idle. When water use drops the system pressure to a preset start-up threshold known as the cut-in pressure, the electrical contacts inside the pressure switch close and start the pump motor. Common cut-in thresholds for residential homes are 30, 40, or 50 psi.
As the pump runs, it refills the pressure tank and compresses the air cushion. Once pressure reaches the cut-out threshold, the switch contacts snap open, shutting the pump off. Common cut-out settings are 50, 60, or 70 psi. The difference between these two points is the differential, which comes factory-set at 20 psig and can typically be adjusted between 10 and 40 psig on a standard switch rated up to 100 psig.
When any part of this system fails to build or read that pressure correctly, the pump keeps running with no signal telling it to stop.
Mechanical Reasons a Well Pump Won't Shut Off
A well pump runs without stopping whenever the plumbing system cannot build enough water pressure to trigger the cut-out setting on the pressure switch.
Continuous downstream water leaks are the most common source of uninterrupted running. A ruptured underground pipe, a cracked fitting, or a stuck plumbing fixture constantly bleeds water out of the pressurized loop. Because water escapes at or near the rate the pump supplies it, water pressure inside the tank never climbs to the cut-out set point. The pressure switch stays closed, and the pump motor keeps running continuously.
A second common cause is a pressure tank that has lost its captive air charge. In a diaphragm or bladder tank, a tear in the rubber separator allows water into the air chamber, causing the tank to become waterlogged. Plain steel tanks without bladders can similarly lose their air volume as water absorbs the air over time. Without an air spring to compress, system pressure cannot stabilize, which can leave the pump running continuously under even small household demands.
A failing or misaligned pressure switch is the third primary cause. Sediment can clog the small pressure port beneath the switch, preventing water pressure from reaching the internal diaphragm. Electrical contact points can also weld shut from electrical arcing. Furthermore, if an unqualified person adjusted the cut-out pressure higher than the physical pumping capacity of the well pump, the pump will run indefinitely trying to hit an unreachable pressure target.
| Observed Condition | Likely Underlying Cause | Required Action |
|---|---|---|
| Pump runs continuously while indoor fixtures show normal or low flow | Underground supply line leak or stuck interior plumbing valve | Inspect interior fixtures and contact a licensed well contractor |
| Pump runs constantly with rapid pressure swings when opening a faucet | Pressure tank is waterlogged or bladder has ruptured | Have a licensed well contractor test the tank air pre-charge |
| Pump runs continuously while tank gauge exceeds normal cut-out pressure | Pressure switch contacts welded shut or cut-out set too high | Turn off circuit breaker immediately. Call a well contractor |
| Well pump running but no water flows from household taps | Water level in well has dropped below pump intake or pump lost prime | Shut off breaker immediately to prevent motor burnout. Call a pro |
Diagnosing Why a Well Pump Won't Shut Off
Plumbing fixtures inside the home are the most frequent source of continuous water loss on a private well system.
A toilet fill valve that fails to seat completely can silently drain a large volume of water straight into your septic tank or sewer connection, day after day. Because the water dumps silently down the overflow tube, you may notice only the background hum of the pump motor. Reverse osmosis water filters with stuck auto-shutoff valves and stuck bypass valves on water softeners can create the exact same continuous demand.
Outdoor fixtures present similar hidden risks. A cracked underground pipe between the wellhead and the house foundation allows water to escape directly into the soil. Because water can seep away underground without surfacing immediately, system pressure remains depressed below the 50 to 70 psi cut-out threshold. Walking the path of the buried water line to check for spongy soil, standing water, or localized patches of unusually green grass can help identify an underground supply line break.
Fixture Checks Before Calling a Professional
Homeowners can safely gather diagnostic information by inspecting visible plumbing fixtures and observing system gauges.
Begin by inspecting every toilet in the house. Remove the tank lids and confirm that water is not spilling into the overflow tubes or leaking past the bottom flappers. Check all interior sinks, tub spigots, laundry supply hoses, and basement floor drains for active dripping or running water.
Next, verify that all outdoor hose bibs, spigots, and irrigation backflow preventers are turned off completely. A hose nozzle left under pressure with a slight drip can keep a well pump running constantly.
If every fixture is closed and the pump continues running, locate the main shutoff valve on the household side of the pressure tank. Temporarily close this valve to isolate the home plumbing from the well equipment. If closing this valve causes the pressure gauge to climb and the pump shuts off, the water loss is occurring inside the house plumbing. If the pump continues running without building pressure even when the house is fully isolated, the failure sits between the pressure tank, the pressure switch, and the well casing.
Record the reading on the tank pressure gauge and note whether the needle moves at all during pump operation. This specific reading helps the contractor diagnose whether the pump is mechanically worn, whether the water table has fallen, or whether the pressure switch is stuck.
Do not remove the pressure switch cover or adjust the internal calibration springs. Pressure switches carry line-voltage electrical service to the pump circuit. The Water Systems Council explicitly states that switch adjustments should be performed only by a licensed well contractor.
Risks of Unchecked Continuous Pump Operation
Allowing a well pump to run without stopping creates severe mechanical strain and dramatically shortens equipment life.
According to the Water Systems Council info sheet on well pumps, most normal wear and tear on a pump occurs during start and stop cycles. However, continuous operation introduces thermal hazards. Submersible pumps down in a well depend on water flowing continuously across the motor housing for cooling. Jet pumps located in basements or pump houses generate high internal friction. Without water movement to dissipate heat, internal impellers and diffusers can warp or melt.
Running continuously also risks burning out motor windings, tripping electrical breakers, and wasting substantial electrical power. If an underground pipe failure is the underlying cause, pumping a large volume of water into the soil around your foundation can lead to ground settling and structural water intrusion.
When to Call a Licensed Well Contractor
Mechanical repairs on well tanks, electrical pressure switches, and well pumps require the specialized equipment of a licensed professional.
The Water Systems Council explicitly instructs well owners to contact a licensed well contractor whenever a pressure switch chatters, continually trips the low-pressure cutoff, or will not maintain pressure. Adjusting the small and large spring nuts inside a switch alters the cut-in threshold and differential pressure. Incorrect adjustments can prevent the switch from ever opening, burning out the motor. If your switch includes a low-pressure cutoff designed to shut off the pump when pressure drops 10 psig below cut-in, tripping this control indicates a loss of prime or a low water level that requires professional evaluation.
To find a qualified contractor, the Water Systems Council provides the free wellcare® Hotline at 1-888-395-1033 to connect well owners with licensed professionals in their area.
This diagnostic guide is not intended for properties on municipal water systems, nor does it apply to high-volume commercial irrigation systems. What would change our diagnostic approach is a low-yield well equipped with an atmospheric storage tank and a separate booster pump, where continuous run times are regulated by specialized liquid-level float sensors rather than a standard pressure switch. For standard residential pressure systems, if basic fixture checks show no open valves while your well pump won't shut off, switch off the pump circuit breaker and contact a licensed well contractor to test the switch and tank.
Shut off the dedicated pump circuit breaker if the pump runs continuously without producing water. Running a well pump dry will destroy the pump motor and mechanical seals in minutes.
Common questions
Why is my well pump running constantly?
A well pump runs constantly when an undetected plumbing leak draws water continuously, the pressure tank loses its air charge, or the pressure switch contacts fail to open. Check your toilets and outdoor faucets first, then contact a licensed well contractor if the fixtures are dry.
Is it bad for a well pump to run all the time?
Yes. Constant running causes the pump motor to overheat, rapidly wears down internal impellers, and can burn out motor windings. Continuous running also risks pumping your well dry if the water table is low.
What causes a well pump to run constantly when no water is being used?
When no indoor faucets are open, a constantly running pump points to a leaking toilet flapper, an underground supply pipe leak, a waterlogged pressure tank, or a clogged pressure switch sensor. Isolate the main house valve to determine whether the leak is indoors or underground.
What does it mean if my well pump is running but no water comes out?
A well pump running but no water arriving at taps indicates a broken down-hole pipe, a lost pump prime, or a dropped well water level. Turn off the pump circuit breaker immediately to prevent running the motor dry, and call a licensed well contractor.
How do I know if the problem is my pressure switch or a water leak?
Shut the main water valve between the pressure tank and your house. If the pump builds pressure and shuts off normally, the issue is an interior plumbing leak. If the pump continues running with the house supply isolated, the fault lies in the pressure switch, tank, or well supply piping.
Can I adjust the pressure switch nuts myself to make the pump shut off?
No. The Water Systems Council advises that pressure switch adjustments should be handled only by a licensed well contractor. The switch contains live electrical contacts, and incorrect spring tension can prevent the switch from shutting off, causing motor burnout.