A healthy well system is almost silent. You might hear a click at the pressure switch, a quiet hum from a jet pump or the tank filling, and then nothing. Anything beyond that is worth a moment’s attention — and knowing where the sound comes from narrows the cause straight away.

Find where the sound is coming from

Before anything else, stand near each part of the system while someone runs a tap.

• At the pressure switch — the small grey box on the pipe near the tank.
• At the control box — a separate box on the wall, if you have a three-wire submersible.
• At the pump itself — only possible with a jet pump, which sits above ground.
• In the pipes — walls, crawlspace, or at the wellhead outside.

What each sound means

Humming, no water	Power reaches the motor but it cannot turn. A failed start capacitor or relay, or a seized motor. Power off. See control box symptoms.
A click every few seconds	The pump starting and stopping repeatedly: short cycling. Almost always a waterlogged tank. See pump turning on and off.
Rapid chattering at the switch	The switch contacts fluttering at cut-in or cut-out. Pitted contacts, a blocked sensing port, or pressure bouncing because the tank has no cushion.
Buzzing at the control box	A relay chattering or a component failing. Often after a thunderstorm.
A bang when the pump stops	Water hammer. The column of water slamming back onto a check valve, or a check valve missing or failing entirely.
A thud or knock as the pump starts	A submersible twisting on startup and the pipe striking the casing. Usually a missing or worn torque arrestor.
Grinding, screeching, rattling jet pumps	Motor bearings wearing out, or debris in the impeller. Bearings rarely improve on their own.
Gurgling or sputtering in pipes	Air in the lines. See air in well water lines.
Whistling or high-pitched whine	Water squeezing through a restriction: a partly closed valve, a clogged filter, or a failing pressure-reducing valve.
Running sound that never stops	The pump is not shutting off. See well pump won’t shut off.

The sounds people ignore that they should not

Clicking

Short cycling is the most commonly ignored noise on any well system, because the water still works. But every click is a motor start, and a pump starting hundreds of times a day is wearing out many times faster than it should. It is also usually a cheap fix: recharging or replacing a waterlogged tank.

Banging

Water hammer is not only a noise. The pressure spike behind each bang stresses fittings, joints and the tank. A check valve that has started slamming is often on its way to failing open, at which point the symptom changes to water draining back down the well.

Grinding

On a jet pump, worn bearings get louder and then fail. If a jet pump has become noticeably noisier over a few weeks, having it looked at before it seizes is almost always cheaper than waiting. More on this on our jet pump repair page.

What you can safely do

1. Note which sound, where, and when. During use, at start, at stop, or constantly.
2. Record a short video with sound. It is genuinely useful to whoever comes out.
3. Watch the pressure gauge while it happens. Numbers at the moment of the noise narrow things down further.
4. Check the tank. Knock on it top to bottom. Solid all the way up means waterlogged.
5. Leave the switch and control box closed. Both carry 240 volts.

What to remember

1	Humming without water: power off. The motor is stalled and heating.
2	Clicking is not harmless. Every click is a start, and starts wear the pump out.
3	A bang at stop is a check valve. Deal with it before it fails open.
4	Record it. A thirty-second video tells a technician a great deal.
5	Burning smell: power off, no exceptions.

Frequently asked questions

Why is my well pump humming but not pumping water?

The motor is receiving power but cannot start turning. The usual cause on a three-wire submersible is a failed start capacitor or relay in the control box. It can also be a seized motor. Turn the power off to prevent overheating.

Why does my well pump click on and off?

That is short cycling, most often caused by a pressure tank that has lost its air charge. It wears the pump out quickly and is usually inexpensive to fix.

What causes banging in pipes when the well pump shuts off?

Water hammer, where the moving column of water stops suddenly against a check valve. A worn or slamming check valve is the most common cause.

Is it normal for a well pump to make noise?

A soft click at the pressure switch and a quiet running hum from a jet pump are normal. Submersibles are usually almost silent from inside the house. Clicking, banging, grinding or humming without flow are not normal.

Why is my jet pump so loud?

Worn motor bearings, debris in the impeller, or a pump struggling to lift water because of a suction leak or a falling water level. Increasing noise over weeks usually means bearings.

Why does my pressure switch buzz or chatter?

Pitted contacts, a partially blocked sensing port, or pressure fluctuating rapidly because the tank has lost its air cushion. Replacing the switch without checking the tank often leads to the same problem again.

Can I hear a submersible pump from the house?

Not usually. If you are hearing noise from the well, it is more often the pipe knocking against the casing on startup, which points to a missing or worn torque arrestor.

See our well pump repair page for what a full diagnosis covers, or the early signs of a failing pump.