Quick answer
A residential well pump is the electric pump that lifts groundwater from a private well and pushes it into the home’s pressure tank and pipes, either from inside the well below the water level (a submersible pump) or from the surface by suction (a jet pump).
Well depth mostly decides the type. EPA calls jet pumps the most common choice for shallow wells of 25 feet or less and submersible pumps the most common for deep wells.
Quick facts
The key facts about Residential Well Pump, with sources:
Key takeaways
- Deep drilled wells almost always use a submersible pump; shallow wells often use a jet pump at the surface.
- The pump does not run each time you open a tap; the pressure tank and switch decide when it starts.
- No water, constant running and rapid on-off cycling each point to different problems.
- Pump work involves live wiring and pulling pipe from the well, so it is licensed-contractor work.
- Disinfect the well after any repair, and never restart a pump that may have been flooded.
What a residential well pump does in a private water system
Homes on public water get pressure from the utility. Homes on a private well make their own.
Nebraska Extension describes the usual setup as a drilled well with a submersible pump and a pressure tank, controlled by a pressure switch 2.
The pump lifts water; the tank stores it under pressure; the switch tells the pump when to run.
A well professional picks the pump from the depth to groundwater, the pressure needed, and the number and flow of fixtures in the house 1. Most pumps run on utility power; remote ones may use wind, solar or a generator 1.
The pump is only half of the system. The pressure tank is the other half, and many “pump problems” turn out to start there.
The pump is not the pressure
Low or uneven pressure at the taps is often a pressure tank or switch problem, not a weak pump. Nebraska Extension notes that a pump that runs only a few seconds and shuts off means there is not enough air in the pressure tank 2.
How water moves from the aquifer to your faucet
- Pressure drops: You use water and the pressure switch senses the drop to its cut-in point, for example 30 psi 5.
- Pump starts: The switch sends power to the pump motor.
- Water lifts: A submersible pushes water up the drop pipe; a jet pump uses a venturi to create a partial vacuum that draws water up 1.
- Through the pitless adapter: On most newer wells, water leaves the casing below the frost line through a pitless adapter and travels to the house 1.
- Tank fills: The pump refills the pressure tank until the cut-out point, for example 50 psi, then stops 5.
Which well pump types exist and where each fits
| Type | Where it sits | Best fit | Trade-off |
|---|---|---|---|
| Submersible | Inside the well, below water level | Drilled wells; the most common pump for deep private wells 31 | Must be pulled from the well for repairs 1 |
| Shallow-well jet | Above ground, on or near the well | Water less than 25 feet down 1 | Needs frost protection and priming 1 |
| Deep-well jet | Pump on top; jet in the well below water | Water 25 to 250 feet down; wells 3 inches or smaller 1 | Lower pressure and yield than a submersible 1 |
| Centrifugal | Above ground | Shallow sources and booster use; up to 25 feet suction lift 1 | Loses prime if the intake leaks 1 |
| Variable-speed (VFD) submersible | Inside the well | Constant-pressure systems 1 | Sensitive electronics need trained service 2 |
Example: how water depth narrows the choice
Nebraska Extension gives depth limits for each above-ground pump type 1. Apply them to three hypothetical wells:
| Well | Water level | Pump types that fit | Why |
|---|---|---|---|
| Driven well near a lake | 15 feet down | Shallow-well jet, centrifugal or submersible | Within the 25-foot suction limit 1 |
| Older small-diameter drilled well | 120 feet down, 3-inch casing | Deep-well jet | Deep jets serve 25–250 feet in wells 3 inches or less 1 |
| Modern drilled well | 200 feet down, 6-inch casing | Submersible | Casing of at least 4 inches fits a submersible 1 |
Depth is not the only input. The pro also weighs the pressure needed and the household’s fixture flow 1, and the water level that matters is the level while pumping, which can be lower than the resting level 2.
Where the pump and its controls are
A submersible pump is out of sight, hanging in the well on drop pipe and wire. The visible clues are the wellhead and cap in the yard and, inside, the pressure tank, pressure switch and gauge.
Nebraska Extension notes that the pump and motor are one unit about 3½ inches across and 2 to 3 feet long, needing a casing at least 4 inches wide, with some models for 3-inch wells 1.
A jet pump sits on top of the well or in a pump house or basement, connected by pipe 1. Because it is above ground, it is easier to reach but needs protection from freezing 1.
Find your pump’s breaker too: Nebraska Extension says shutting it off is how you stop the pump in a leak emergency, then close the valve after the tank 2.
The sizes below explain why a submersible needs a drilled well and why old pits are gone from new installs.
- 3½ inTypical submersible pump-and-motor diameterUnit is 2 to 3 feet long
- 4 inMinimum casing for most submersiblesSome models fit 3-inch wells
- 3 in or lessWell size a deep-well jet can serveWater 25 to 250 feet down
- 10 ftMinimum distance of a pit from the wellPits directly over wells are no longer legal there
Source: [1]
Where submersible and jet pumps each come out ahead
Submersible strengths
What a pump cannot do
A pump cannot make a well yield more than the aquifer gives. Nebraska Extension explains that heavy use or drought can drop the water level until the pump is no longer submerged, and the fix may be setting the pump at a different depth based on the static and pumping water levels 2.
Jet pumps cannot pull water from more than about 25 feet by suction alone, and any air leak in the suction pipe makes them lose prime 1. And no pump runs without power: during an outage, a private well delivers only what is left in the pressure tank.
What makes well pump work cost more or less
We do not print prices, because fair numbers need dated local quotes.
For a submersible, the biggest driver is depth: the crew must pull the pump, drop pipe and wire out of the well, which Nebraska Extension notes is part of any repair or maintenance check 12.
Pump horsepower, wire length, pipe replacement, a new pressure tank or switch, and a VFD controller add to it.
For a jet pump, access is easier, but priming problems, suction leaks and freeze damage add labor. After any repair, plan for disinfection and a water test 6. Our plumbing cost guide covers other price drivers.
We found no independent lifespan figure for well pumps we could verify; cycling frequency, sand and power quality all affect it. Check the pump maker’s warranty.
How a well pump is replaced
Licensed well-contractor work. EPA advises hiring contractors who are bonded, insured and licensed where your state requires it 3.
- Diagnose first: check the breaker, the pressure switch and the tank before blaming the pump 25.
- Shut off power at the breaker and confirm it is dead.
- Pull the pump, drop pipe and wire (submersible), or disconnect the above-ground unit (jet) 1.
- Inspect the pipe, wire and check valve for corrosion or damage 2.
- Set the new pump at a depth based on static and pumping water levels 2.
- Shock chlorinate the well and plumbing, then test for bacteria 6.
Keeping a well pump healthy
- Watch for short cycling and have the pressure tank air charge checked when it starts 2.
- Check the wellhead: sealed cap, insulated wires, ground sloping away, trees at least 10 feet off 5.
- Test the water every year for total coliform bacteria, nitrates, total dissolved solids and pH 4.
- Keep a log of service, depth settings and repairs.
- Keep jet pumps and their pipes protected from freezing 1.
Warning signs and what they usually mean
- No water at all: check that the house has power, then the pump breaker or fuse 2. A sticking pressure switch, sometimes from ants, is another cause 5.
- Little water, especially in heavy use or drought: pump may be set too high in the well 2.
- Pump runs nonstop: a stuck check valve or a broken line 2.
- Pump runs seconds, stops, repeats: not enough air in the pressure tank 2.
- Sputtering air or sand: water level or pump problem; call a pro.
Electricity, floods and wells
Well pumps run on high-voltage circuits. Nebraska Extension says homeowners should not adjust the pressure switch because it is connected to power and could cause serious injury 2.
After a flood, Tennessee’s health department says do not turn on the pump, because of shock danger and possible damage, and to have a licensed well contractor inspect it first 7.
For no water in an emergency, see plumbing emergencies.
Who regulates well pumps
Testing is the owner’s job: EPA advises yearly testing for total coliform bacteria, nitrates, total dissolved solids and pH, and using certified labs 4.
Contractors: EPA notes some states license and certify well drillers and pump installers, and some use the National Ground Water Association’s exams for licensing 3. In Nebraska, pump service is done by state-licensed professionals 2.
Construction rules: Nebraska Extension notes a well pit directly over a well is no longer legal there; pits must be at least 10 feet away, and pitless adapters are now used on most new wells 1.
Disinfection: Kansas State Extension lists shock chlorination after any repair of the water system 6. Rules checked 2026-10-13.
How a well pump differs from sump, grinder and recirculation pumps
| Pump | Moves | Key difference |
|---|---|---|
| Residential well pump | Groundwater to the house | Supplies all drinking water; pressure-switch controlled 1 |
| Sump pump | Groundwater out of a basement pit | Removes water; does not supply it |
| Grinder pump | Sewage to a pressure sewer | Wastewater side |
| Recirculation pump | Hot water around a loop | Inside the house plumbing |
Well pump myths about pressure, depth and repairs
- Myth The pump runs every time a tap opens.
- Reality The pressure tank supplies water until the switch calls the pump 1.
- Myth A jet pump can work in any well.
- Reality Shallow jets lift from less than 25 feet 1.
- Myth After a repair the water is ready to drink.
- Reality Shock chlorination is advised after any repair 6.
- Myth A flooded pump just needs to dry out.
- Reality Do not turn it on until a licensed contractor inspects it 7.
Frost, drought and flooding by region
Climate shapes how a well pump is set up. In cold regions, pitless adapters keep the line below the frost line and above-ground jet pumps need frost protection 1. In drought, falling groundwater can leave a pump above the water 2.
In flood-prone areas, Tennessee’s post-flood guidance says to inspect wiring, well caps and seals, test the water, and not restart the pump until it is checked 7. Your state well program and local health department have region-specific rules.
When to repair, replace or rethink a well pump system
Rule out the cheap causes first: breaker, pressure switch and tank air. If the pump itself has failed, ask the contractor to check its depth setting against the pumping water level before buying the same pump again. If pressure swings bother you, ask whether a constant-pressure VFD system fits your well.
Next step: find and label the pump breaker and the main valve after the pressure tank today, before you need them.
Ask for the pump setting depth in writing
Nebraska Extension notes the right pump height depends on the static and pumping water levels 2. Ask the contractor to write both levels and the pump depth on the invoice; it saves time on every future service call.
Questions about Residential Well Pump
Why is my well water pressure low?
Start with the tank and switch, not the pump. Nebraska Extension notes that a pump cycling every few seconds means the pressure tank has lost its air, and Clemson lists a sticking pressure switch as a common fault.
Low pressure that appears only during heavy use or drought can mean the pump is set too high in the well. If those check out, a worn pump or a leak in the line is next.
How do I know if my well pump is going bad?
Signs include no water, very low flow, a pump that runs without stopping, and sputtering or sand in the water. A pump that starts and stops every few seconds usually points to the pressure tank instead. Check the breaker and pressure switch before assuming the pump failed.
What is the difference between a submersible and a jet pump?
A submersible pump sits in the well under the water and pushes water up. A jet pump sits above ground and uses a venturi to create suction. Submersibles give higher pressure and yield and do not need frost protection; jet pumps are easier to reach for repairs.
Why does my well pump keep running?
Nebraska Extension lists two common causes: a check valve in the pump or riser pipe stuck open, or a break in the water line between the well and the house or inside the house. A soggy area in the yard can point to a broken line.
What should I do if my well has no water?
First make sure the house has power. Then check the breaker or fuse for the well pump. If that does not fix it, call a licensed well contractor. The pressure switch can also stick, and in drought the water level may drop below the pump.
Do I need to disinfect my well after the pump is replaced?
Yes. Kansas State Extension lists shock chlorination following any repair of the water system, because tools and parts lowered into the well can carry bacteria. Test the water for bacteria afterward and repeat if the test is positive.
Can I replace a well pump myself?
It is not a typical homeowner job. It involves high-voltage wiring and, for submersibles, pulling pipe and wire from the well. Many states license pump installers, and Nebraska Extension recommends a state-licensed professional for pump and pressure switch work.
What happens to my well during a power outage?
The pump stops, so you only have the water stored in the pressure tank. After a flood, do not turn the pump back on until a licensed contractor has inspected it, because of shock risk and possible damage, as Tennessee’s health department advises.
How deep should a well pump be set?
It depends on the well. Nebraska Extension says a professional should measure the static water level and the level while pumping, then set the pump at an appropriate height so it stays submerged during heavy use and dry seasons.
Sources
- Nebraska Extension, Private Drinking Water Wells: Water Distribution System Components (G2152), retrieved .
- Nebraska Extension, Private Drinking Water Wells: Operation and Maintenance of Mechanical Components (G2153), retrieved .
- U.S. EPA, Learn About Private Water Wells, retrieved .
- U.S. EPA, Protect Your Home’s Water (private wells), retrieved .
- Clemson Cooperative Extension, Residential Drinking Water Well: Well Components (1st in Series), retrieved .
- Kansas State University Research and Extension, Shock Chlorination for Private Water Systems (MF911), retrieved .
- Tennessee Department of Health, Protecting Your Well After a Flood (Helene 2024 guidance), retrieved .
Expert review
Written by the HyrePlumber Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Pump types, depth limits, dimensions, priming, frost protection, pitless adapters and well-pit rule from Nebraska Extension G2152; troubleshooting, depth setting, VFD service and switch safety from G2153.
Most-common pump by well depth and contractor licensing from EPA. Switch settings and wellhead checks from Clemson Extension. Shock chlorination after repair from Kansas State (MF911); post-flood steps from the Tennessee Department of Health.
Example wells are hypothetical and apply the cited limits. Yearly testing advice from EPA’s Protect Your Home’s Water page. No prices or lifespans.
Suggest a correction. We fix errors and say what changed.