Well Pump Runs but No Water? 8 Causes and What to Do
You hear the well pump running, but the taps give you a trickle or nothing at all. It is one of the most common well problems, and the cause is usually one of a short list.
This guide walks through that list in the order a pump contractor would check it. Most of the early checks take minutes and need nothing more than your eyes and the pressure gauge.
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- Stop the pump first if it runs with no water. Running dry can burn out the motor within minutes.
- The top causes are a low water level, a leak in the drop pipe, a stuck check valve and, on jet pumps, lost prime.
- If the gauge reads normal but the taps are dry, look at a clogged sediment filter inside the house before blaming the pump.
Why Is There No Water? Quick Checker
Answer what you can see and hear. The checker ranks the likely causes.
A quick guide to narrow things down, not a diagnosis. Turn off the power before you touch any wiring.
What to Do in the First 5 Minutes
- Turn the pump off at the breaker. A pump that runs without water overheats and can fail.
- Read the pressure gauge on the tank or pipe. Note the number before you do anything else.
- Open a tap near the tank. If it runs well there, the problem is between the tank and the rest of the house, often a filter.
- Think about what changed. Heavy watering, a dry spell, a freeze, a storm or recent work on the well all point to different causes.
- Wait 1 to 2 hours, then switch back on. If water returns and then fades again, the well is likely running low.
The 8 Causes, From Most to Least Common
| Cause | Typical sign | DIY or pro |
|---|---|---|
| Water level below the pump | Water comes back after a rest, then fades | DIY to confirm, pro to fix |
| Clogged sediment filter | Gauge normal, taps weak | DIY |
| Leak or split in the drop pipe | Pump runs long, pressure never builds | Pro (pump pull) |
| Check valve stuck closed | Pump runs, no flow at all | Pro for submersibles |
| Frozen line | After a cold night, pipes in a pit or crawlspace | DIY with care |
| Jet pump lost prime | Pump whines, gauge near zero | DIY |
| Broken coupling or shaft | Motor runs, no water, low amps | Pro |
| Worn pump | Flow drops slowly over months | Pro |
These causes match the standard troubleshooting lists used by pump suppliers, such as “low water level in well”, “leaks in system or drop pipe”, “check valve stuck closed” and “loose coupling or broken motor shaft” (The Driller (submersible motor troubleshooting)).
1. The water level dropped below the pump
Every well can only give so much water an hour. A long lawn soak, filling a pool or a dry season can draw the water below the pump intake, and the pump starts pulling air.
Give it a rest of 1 to 2 hours. If water comes back and then fades again with heavy use, measure your flow with our bucket test and compare it with what the pump delivers.
2. A clogged sediment filter
A filter cartridge packed with sand or iron can cut flow to a trickle while the pump and tank look fine. Turn the filter bypass valve, or remove the cartridge, and see if flow returns.
3. A leak in the drop pipe
In a submersible system, the pipe from the pump to the surface can split or a fitting can loosen. Water goes up and pours back into the well, so the pump runs a long time and pressure barely moves.
4. A check valve stuck closed
Check valves stop water draining back down the well. If one jams shut, nothing gets past it. On submersible pumps the valve sits down the well, so it needs a contractor.
5. A frozen line
In cold weather, pipes in a well pit, crawlspace or the small tube under the pressure switch can freeze. Warm the area with a space heater or hair dryer; never use a torch. Our guide on keeping a well pump from freezing shows how to stop it happening again.
6. Lost prime (jet pumps)
Above ground jet pumps need water in the pump body to work. See the section below.
7. A broken coupling or motor shaft
The motor turns, but the pump end does not. You hear normal running sounds, yet no water moves. A clamp meter shows low amps, and the fix is a pump pull.
8. A worn pump
Sand wears the impellers over years, so the pump delivers less and less. If flow has dropped slowly, read our signs your well pump is going bad.
Jet Pumps: How to Re-Prime
- Switch off the power.
- Open a tap to release pressure.
- Remove the prime plug on top of the pump.
- Fill the pump body and suction pipe with clean water until it overflows.
- Refit the plug, switch on and let it run a few minutes. Repeat if needed.
If the pump loses prime again within days, air is getting in. Check the suction fittings and the foot valve at the bottom of the suction pipe.
Pressure gauge for your tank tee
A working gauge is the single most useful tool for diagnosing a well. If yours is stuck or unreadable, a replacement costs little and threads onto the tank tee.
See options on AmazonWhen to Call a Pump Contractor
- The pump is silent and the breaker, switch and wiring look fine.
- You suspect a drop pipe leak, a stuck check valve or a broken coupling.
- The breaker trips when the pump starts; see well pump keeps tripping breaker.
- The well runs low often. A contractor can lower the pump or fit a smaller one.
A pull costs more than a part, so ask for a diagnosis first. Our well pump replacement cost guide shows typical prices.
Frequently Asked Questions
Why is my well pump running but no water is coming out?
The most common causes are a water level that dropped below the pump, a leak in the drop pipe, a check valve stuck closed, a clogged filter or, on jet pumps, lost prime. Turn the pump off to protect it, then check the pressure gauge and filter.
Can a well pump run dry and get damaged?
Yes. Pumps rely on water to cool them. Running dry for long can overheat the motor and damage the pump, so switch it off if no water is coming.
How long does a well take to recover?
It depends on the well. Many recover within an hour or two after heavy use. A bucket flow test after a rest gives you a better idea of your well’s yield.
Do I need to prime a submersible pump?
No. Submersible pumps sit under the water and do not need priming. Only above ground jet pumps and some shallow well pumps do.
Should I turn off my well pump if there is no water?
Yes. Switch it off at the breaker to stop it running dry while you check the cause.
Sources: The Driller (submersible motor troubleshooting); R.C. Worst.
