Well Pump Running Constantly and Won't Shut Off? Why
Quick Answer: A well pump that runs constantly and won't shut off means the system can't reach the pressure that tells the pump to stop. Common causes are a leak in the system that keeps bleeding off pressure, a worn or failing pump that can't build enough pressure to reach the cut-off point, a pressure switch problem (stuck or misadjusted), a waterlogged pressure tank, a clogged screen, or a dropping water level in the well. Running constantly overheats and wears the pump and can burn it out, and it wastes water and energy, so it shouldn't be left running. Turning the pump off and having the cause diagnosed protects it from damage.
A well pump is supposed to run to build pressure, then shut off and rest. When it runs constantly and never shuts off, something is preventing the system from reaching the pressure that signals the pump to stop — and that continuous running can quickly damage the pump. Understanding the common causes helps you understand why it's happening and why it's worth acting on it quickly.
Why a Pump Won't Shut Off
A well pump turns off when the system pressure reaches the cut-off point set on the pressure switch. So when the pump runs constantly and won't shut off, the system isn't reaching that pressure — either because pressure is being lost as fast as the pump builds it, the pump can't build enough pressure, or the switch isn't signaling the pump to stop. The pump keeps running in a futile effort to reach a pressure it can't achieve. Identifying which of these is happening is the key to the cause, and it usually points to a leak, a pump problem, a switch issue, or the well itself.
Cause One: A Leak in the System
A leak is a leading cause of a constantly running pump. If there's a significant leak in the well piping, the line from the well to the house, the pressure tank, or the home plumbing — pressure escapes as fast as the pump builds it, so the system never reaches the cut-off point and the pump keeps running. Even a running toilet or a stuck-open fixture can cause continuous water use, keeping the pump running. So a constantly running pump often means water is being lost somewhere. Signs of a leak — wet areas, the sound of running water, or unexplained water use — support this cause. Finding and fixing the leak lets the system reach pressure, and the pump shuts off.
| Cause | Why the pump won't shut off |
|---|---|
| Leak in the system | Pressure lost as fast as it's built |
| Worn or failing pump | Can't build enough pressure to cut off |
| Pressure switch stuck/misadjusted | Pump not signaled to stop |
| Waterlogged pressure tank | System can't reach proper pressure |
| Clogged screen/intake | Pump can't maintain flow and pressure |
| Dropping well water level | Pump struggling to draw water |
Cause Two: A Worn or Failing Pump
If the pump itself is wearing out or failing, it may not be able to build enough pressure to reach the cut-off point, so it runs continuously without ever satisfying the switch. A pump that's lost performance — from age, wear, or damage — struggles to reach normal pressure, which keeps it running. This is a more involved cause, but a common one for a pump that won't shut off, especially on an older pump. Related, a clogged pump screen or intake can keep the pump from maintaining the flow and pressure needed to cut off.
Cause Three: The Pressure Switch or Tank
The pressure switch controls when the pump stops, so a switch that's stuck, misadjusted, or faulty can fail to signal the pump to shut off even when pressure is adequate, leaving it running. And a waterlogged pressure tank, which can't store pressure properly, can contribute to the system not reaching or holding the cut-off pressure. These control components directly govern the pump's on/off behavior, so a problem with them can manifest as the pump not stopping. Checking the switch and tank is part of diagnosing constant running.
Cause Four: The Well Itself
Sometimes the issue is the water supply. If the water level in the well drops — due to a falling water table, drought, or drawing water faster than the well can recover — the pump may struggle to draw water and build pressure, running constantly as it tries to keep up with limited water. A dropping well level is a possible cause, particularly in dry conditions or with a well that's at the edge of its capacity. This points to the well and water supply rather than just the equipment.
Don't let a well pump run constantly without addressing it. Continuous running overheats and wears the pump motor and can burn out the pump, turning a fixable problem like a leak or switch into a costly pump replacement. If your pump won't shut off, it's best to turn it off to protect it and have the cause diagnosed, rather than letting it run. Avoid working on the electrical pump system yourself.
Why You Shouldn't Let It Run
A pump running constantly is a problem on multiple fronts. It overheats and wears out the pump motor, which can burn out the pump, and replacing a well pump is a significant job. It wastes water and energy, especially if a leak is involved. And if the cause is a dropping well level, running the pump dry can damage it. For all these reasons, a pump that won't shut off shouldn't simply be left running. The safer course is to turn the pump off to protect it and have the cause diagnosed and repaired. Because a well system involves electrical components, a pump, and pressure controls, a well professional can identify whether it's a leak, the pump, the switch, the tank, or the well, and fix it before the pump is damaged.
Frequently Asked Questions
Because the system isn't reaching the pressure that tells the pump to stop. Common causes are a leak bleeding off pressure as fast as the pump builds it, a worn or failing pump that can't reach cut-off pressure, a stuck or misadjusted pressure switch, a waterlogged pressure tank, a clogged screen, or a dropping well water level. The pump keeps running, trying to reach a pressure it can't achieve.
Yes, it's a leading cause. A significant leak in the well piping, the line to the house, the tank, or the home plumbing lets pressure escape as fast as the pump builds it, so the system never reaches the cut-off point and the pump keeps running. Even a running toilet can do it. Signs of a leak alongside constant running point to this cause; fixing the leak lets the pump shut off.
Yes. Continuous running overheats and wears the pump motor and can burn out the pump. Replacing a well pump is a significant job. It also wastes water and energy, and if the cause is a dropping well level, it can run the pump dry and damage it. For these reasons, a pump that won't shut off shouldn't be left running — it's best turned off and the cause diagnosed.
It's possible. If the water level in the well drops — from a falling water table, drought, or drawing water faster than the well recovers — the pump may struggle to draw water and build pressure, running constantly as it tries to keep up. A dropping well level is a possible cause, especially in dry conditions. This points to the water supply rather than the equipment, and running the pump dry can damage it.
Yes. The pressure switch controls when the pump stops, so a switch that's stuck, misadjusted, or faulty can fail to signal the pump to shut off even when pressure is adequate, leaving it running. A waterlogged pressure tank can also contribute by preventing the system from reaching or holding the cut-off pressure. Checking the switch and tank is part of diagnosing a pump that won't shut off.
Turn the pump off to protect it from the damage continuous running causes, then have the cause diagnosed. Because the system involves electrical components, a pump, and pressure controls, and the cause could be a leak, the pump, the switch, the tank, or the well, a well professional should identify and fix it. Acting promptly prevents the constant running from burning out the pump.
Don't Let It Run Itself to Failure
A well pump running constantly and won't shut off means the system can't reach the pressure that stops the pump — usually a leak, a worn pump, a switch or tank problem, or a dropping well level. Because continuous running overheats and can burn out the pump, it's worth acting fast: turn the pump off to protect it and have the cause diagnosed. Fixing the real problem stops the constant running before it turns into a costly pump replacement.
Well pump running nonstop and won't shut off? — Turn it off and get the cause diagnosed before it burns out the pump. Fussell Well Drilling serves Polk County and Central Florida. Call (863) 984-3144.
