What happens when you replace a submersible well pump

Replacing a submersible well pump means pulling the old pump out of the well, disconnecting it from the power and water lines, lowering a new pump down into the well on a new drop pipe, and reconnecting everything. The pump sits at the bottom of the well inside a casing (the metal or plastic tube that lines the hole), so the entire assembly has to come up before you can swap it out. Most homeowners hire a well contractor for this job because it requires a winch or pulley system, knowledge of electrical connections, and the ability to work safely at depth.

The job typically takes four to eight hours depending on how deep your well is and whether complications arise. You will be without water during the work, so plan accordingly. If you have a storage tank, you may have water for a few hours after the pump stops. If you do not, you will lose water pressure when ready.

Key Takeaways

  • Submersible well pumps sit at the bottom of the well and must be pulled out completely before replacement, which requires equipment most homeowners do not own.
  • The pump connects to a drop pipe that carries water up, a power cable that runs to a control box, and sometimes a pressure tank — all three must be disconnected and reconnected correctly.
  • Most homeowners hire a licensed well contractor because the work involves electrical connections, heavy lifting, and risk of damaging the well casing if done incorrectly.
  • You will lose water pressure during the replacement, so arrange to have water stored or plan the work for a time when you can be without it.
  • A new pump typically costs $800 to $2,500 depending on depth and flow rate, plus labor that ranges widely by region and contractor.

Signs your submersible pump needs replacement

A submersible pump that is failing will show one or more of these signs: the pressure tank cycles on and off more frequently than it used to, water pressure drops suddenly and does not recover, the pump runs but no water comes out, or the pump makes grinding or squealing noises. You may also notice sand or sediment in your water, which suggests the pump is breaking down internally.

If the pump straightforward stops working and the circuit breaker has not tripped, the pump itself has likely failed. If the breaker trips when you try to restart it, there is an electrical fault — either in the pump, the power cable, or the control box. A well contractor can test the pump and cable to determine what failed, but in most cases a pump that has stopped working is at the end of its life. Submersible pumps typically last 8 to 15 years depending on water quality and how hard the pump works.

What you need to know before calling a contractor

Before you contact a well contractor, gather information about your well so they can give you an accurate estimate and bring the right equipment. You need to know the depth of your well (measured in feet from the surface to the water table), the flow rate of your current pump if you have that information, and whether you have a pressure tank. The depth is the most important number because it determines the length of drop pipe and power cable needed, and it affects how long the job takes.

You can find the well depth on your well completion report, which was filed with your county when the well was drilled. Contact your county health department or building department and ask for the well record by address. If you cannot locate the report, a well contractor can measure the depth by lowering a weighted line down the casing, though they may charge a small fee for this service.

Write down the brand and model of your current pump if you can see it (usually stamped on the motor housing), and note any recent changes in water pressure or quality. Tell the contractor if you have had the well serviced recently or if you know of any problems with the casing. This information helps them anticipate complications.

How the replacement process works

The contractor will arrive with a winch or tripod pulley system, a new pump sized to match your well depth and household water needs, a new drop pipe, and electrical cable. They will turn off power to the well at the breaker box and then begin pulling up the old assembly — the pump, drop pipe, and power cable all come up as one unit. This can take an hour or more if the well is deep or if the pipe is stuck.

Once the old pump is out, they will inspect the inside of the casing for damage, sediment buildup, or corrosion. If the casing is damaged, they will tell you before proceeding because a damaged casing can affect the new pump's performance. They will then lower the new pump down on the new drop pipe, making sure it sits at the correct depth and does not rest on the bottom of the well (which can damage the pump). The drop pipe is connected to the pump at the top, and the power cable is attached to a control box above ground.

The final step is testing: they will turn the power back on, check water pressure at the tank, and run water through the system to make sure everything works. They will also check that the pressure tank is charged correctly (if you have one) and that the pump shuts off when pressure reaches the set point.

Choosing between repair and replacement

If your pump is less than 8 years old and has stopped working, a contractor may be able to repair it by replacing the motor or internal seals without pulling the entire pump out. This is cheaper than full replacement and takes less time. However, if the pump is more than 10 years old, repair is usually not worth the cost because the pump will likely fail again soon.

Ask the contractor whether they recommend repair or replacement. A reputable contractor will be honest about whether a repair will extend the pump's life meaningfully or whether you are better off replacing it. If they recommend replacement but you want a second opinion, you can call another contractor — most will give you a phone estimate based on your well depth and current symptoms.

What to expect for cost and timing

The cost of a new submersible pump varies by region, well depth, and pump capacity. A pump itself typically costs $800 to $2,500. Labor costs vary widely — some contractors charge a flat rate for the job, others charge hourly, and rates differ significantly between rural and urban areas. Call three contractors in your area and ask for a written estimate that includes the pump cost, labor, and any additional charges (such as a site visit fee or a charge for testing the old pump).

The job usually takes one day, but you should plan for the contractor to arrive in the morning and finish by late afternoon. If complications arise — such as a stuck pipe or a damaged casing — the job may take longer or require a return visit. Ask the contractor how long they expect the work to take and whether they charge extra if the job runs over.

Most contractors offer a warranty on the new pump (typically one to five years) and on their labor (typically one year). Ask what the warranty covers and what you need to do to keep it valid — some warranties require annual maintenance or water testing.

Maintaining your new pump to extend its life

A new submersible pump will last longer if you maintain the system around it. Have your water tested annually to check for sediment, iron, or other minerals that can damage the pump. If sediment is present, ask about installing a sediment filter or having the well cleaned. Keep the pressure tank in good condition by checking the air charge annually (a contractor can do this in a few minutes). Make sure the breaker box is dry and the electrical connections are tight.

If you notice water pressure dropping gradually over months, or if you see sediment in the water again, call a contractor sooner rather than later. Catching problems early can prevent pump failure and save you money on repairs.

When to call a professional instead of attempting it yourself

Do not attempt to replace a submersible pump yourself. The work requires specialized equipment (a winch or pulley system rated for the weight of a wet pipe and pump), knowledge of electrical safety (the power cable carries 240 volts), and understanding of how to position the pump correctly in the well. If the pump is not seated at the right depth, it can fail quickly or damage the casing. If the electrical connections are wrong, you risk electrocution or fire.

A licensed well contractor carries insurance, knows local codes, and can troubleshoot problems that arise during the work. They also have the right tools to pull a stuck pipe safely without damaging the casing. The cost of hiring a professional is far less than the cost of repairing a damaged well or replacing a pump that was installed incorrectly.

Frequently Asked Questions

How long does it take to replace a submersible well pump?

Most replacements take four to eight hours depending on well depth and whether the old pipe comes up easily. A shallow well (under 100 feet) may take four hours; a deep well (over 300 feet) may take eight hours or more. The contractor should give you a time estimate when they arrive.

Can I use the same drop pipe and power cable with a new pump?

No. The drop pipe and power cable should be replaced at the same time as the pump because they degrade over time and can fail shortly after a new pump is installed. Using old pipe or cable is a false economy — you will likely need another service call within a year.

What happens if the old pump is stuck and will not come up?

A stuck pipe usually means mineral buildup or corrosion has bonded the pipe to the casing. The contractor may explore penetrating oil and wait, or use a mechanical puller to work the pipe up gradually. In rare cases, the pipe cannot be removed without damaging the casing, and the contractor will discuss options with you — this is why you should get a written estimate that accounts for complications.

Do I need to drain the well before the pump is replaced?

No. The contractor will turn off the pump and let the water level drop naturally as they pull the assembly up. The well does not need to be drained completely, and draining it is not necessary for the replacement.

How do I know if my new pump is the right size for my well?

The contractor will size the pump based on your well depth, the flow rate you need (how many gallons per minute), and the water level in your well. They will ask how many bathrooms you have and whether you have high water use (irrigation, livestock, etc.). A pump that is too small will not meet your household demand; one that is too large will cycle on and off too frequently and wear out faster. The contractor's recommendation should match your needs.