How do I know if my well pump is going bad?

Rule out the cheap parts first: the breaker, the pressure switch, the pressure tank, and on a three-wire submersible the control box. Short cycling, no water, and low pressure often trace to one of those. The pump itself is the problem when it runs and will not shut off with no leak in the line, when pressure and flow keep dropping with the parts above ground testing good, when it trips the breaker after the wiring and control box check out, or when sand comes through with falling output.

Should I repair or replace a well pump?

Repair when the fault is a single part on a pump a few years old, or when it is above ground: the switch, the tank, or the control box. Replace when the pump itself cannot keep up. If a submersible has to come out of the well and it is ten years old or more, replace it on the same visit, because most of the cost is the pull and you pay for it again when the old pump fails.

What does well pump replacement cost in 2026?

A service call and diagnosis is $150–$400. A pressure switch is $100–$300 installed, a control box or capacitor $150–$500, and a pressure tank $500–$2,000. A jet pump replacement runs $800–$2,500 installed and a submersible $1,500–$4,000, with deep wells and larger pumps past $4,000.

When should you replace a well pump?

Q: How long does a well pump last?

Most well pumps, submersible or jet, last 8–15 years. Hard water, sediment, an undersized pressure tank, and short cycling push toward the low end. Bladder pressure tanks commonly last 10–20 years, and the pressure switch is a wear part you should expect to replace at least once.

Q: Should I test my well water after replacing the pump?

Yes. The CDC recommends testing a private well at least once a year for total coliform bacteria, nitrates, total dissolved solids, and pH, and testing again whenever you replace or repair any part of the well system. Opening the well to pull a pump is a chance for bacteria to get in.

A well pump is out of sight in the most literal way: a submersible sits tens or hundreds of feet down the casing, and you only think about it when the faucet sputters. Many "the pump is dead" calls turn out not to be the pump. They are a pressure switch, a pressure tank, a control box, or a breaker, all of which live above ground and cost a fraction of a pump. So the decision runs in two steps: rule out the cheap parts first, then decide whether the pump that is left is worth keeping.

Rule out the cheap parts first

A well system is a pump, a pressure tank, a pressure switch, and on many submersibles a control box. Each fails in its own way, and several of them look like a dead pump:

No water at all. Check the breaker before anything else. Then the pressure switch, whose contacts pit and burn with every cycle until they stop closing. A switch is $100–$300 installed.
The pump clicks on and off every few seconds while a tap runs. That is short cycling, and the usual cause is a waterlogged pressure tank or one that has lost its air charge, not the pump. Fix it quickly anyway: every start is wear on the motor, and short cycling is how a tank problem becomes a pump problem.
The pump will not start, or hums and trips. On a three-wire submersible, the starting capacitor or relay in the control box is a common culprit, $150–$500 to replace.
Low pressure throughout the house. A clogged sediment filter or a pressure switch set too low can look exactly like a tired pump.

A well contractor's service call, $150–$400, should test these in order before anyone proposes pulling the pump. If the first quote is for a new pump and nobody has checked the switch, the tank charge, or the control box, get a second one.

When the pump itself is the problem

Replace the pump when the fault is down the well and the parts above ground test good:

It runs and will not shut off, because it can no longer build enough pressure to reach the switch's cut-out setting, and there is no leak in the line to explain it.
Pressure and flow keep dropping with a clean filter, a correct tank charge, and a good switch.
It trips the breaker or overheats after the wiring and control box have been checked.
Sand or grit in the water along with falling output. Worn impellers pass sediment, and sediment wears impellers faster.
The electric bill has climbed with no other explanation. A worn pump runs longer to move the same water.

If it comes up, decide on its age

Most of the cost of working on a submersible is getting it out: the crew, the pump hoist, and the hours to pull and reset the pipe and wire. That changes the arithmetic. Once a pump is out of the well, putting the same old pump back down saves only the price of a new pump, and you pay for the pull again when it fails. If a submersible is coming up and it is ten years old or more, replace it on the same visit. If it is a few years old and the fault is a single part, repair it.

A jet pump sits above ground, in a basement or a well house, so there is no pull. Repairs on a jet pump are easier to justify at any age, and replacement is cheaper when it comes.

When it is the well, not the pump

Some symptoms point past the pump. Sputtering faucets and air in the lines, especially in late summer or after heavy use, can mean the water level is dropping toward the pump intake. Sediment that keeps coming back after a new pump can mean a failing screen or casing. A new pump does not fix either. Ask the contractor to measure the static water level and the well's yield before you buy one, and if the yield has fallen, the conversation is about the well, which is a bigger and different decision.

How long does a well pump last?

Well pumps, submersible or jet: most last 8–15 years. Hard water, sediment, an undersized tank, and short cycling push toward the low end.
Bladder pressure tanks: commonly 10–20 years. A tank that is waterlogged or loses its charge repeatedly is done.
Pressure switches: a wear part. Expect to replace one at least once over a pump's life.

A pump in the second half of that range is not broken. It is due, and a dry week is a better time to replace it than the morning there is no water.

What it costs in 2026

Service call and diagnosis: $150–$400.
Pressure switch, installed: $100–$300.
Control box or capacitor, installed: $150–$500.
Pressure tank, installed: $500–$2,000.
Jet pump replacement, installed: $800–$2,500.
Submersible pump replacement, installed: $1,500–$4,000. Deep wells and larger pumps run past $4,000.

See our methodology for how we build these bands. Depth is the biggest driver on a submersible: more pipe and wire to pull and replace, and a larger pump to lift the water.

Test the water after any work on the well

Opening a well to pull a pump or change a part is a chance for bacteria to get in. The CDC recommends testing a private well at least once a year for total coliform bacteria, nitrates, total dissolved solids, and pH, and testing again whenever you replace or repair any part of the well system. Your county health department can point you to a certified lab.

The bottom line

Rule out the breaker, the pressure switch, the pressure tank, and the control box before you replace a well pump; they cause many of the same symptoms and cost $100–$2,000. Replace the pump when it cannot build pressure or keep up and the parts above it test good. If a submersible has to come up and it is ten years old or more, put a new one down on the same visit. A jet pump replacement is $800–$2,500 and a submersible $1,500–$4,000. Test the water afterward. If this is one item on a longer list, our home maintenance budget guide shows where it fits, and the same replace-before-it-fails logic applies to a sump pump.