Most household well pumps draw between 750 and 2,200 watts while running
The wattage your well pump uses depends on the pump type, how deep your well is, and how much water pressure your home needs. A shallow-well jet pump typically uses 750 to 1,500 watts. A submersible pump in a deep well usually draws 1,000 to 2,200 watts. The pump does not run constantly—it cycles on when water pressure drops and off when the pressure tank fills—so your actual daily energy cost is much lower than the peak wattage suggests.
Knowing your pump's wattage matters for two practical reasons: sizing a backup generator if the power goes out, and understanding whether your electrical service can handle it without upgrades. A 200-amp household service can almost always run a well pump, but a smaller or older panel might need an electrician's assessment.
Key Takeaways
- Shallow-well jet pumps typically use 750 to 1,500 watts; deep-well submersible pumps use 1,000 to 2,200 watts.
- Your pump's nameplate or manual lists the exact wattage—multiply horsepower by 746 if only horsepower is given.
- The pump cycles on and off rather than running all day, so peak wattage is not the same as average daily use.
- A generator for backup power should be sized to at least 1.5 times the pump's running wattage to handle the startup surge.
- If your home's electrical panel is older than 40 years or has less than 100 amps, have an electrician check whether the pump needs a dedicated circuit upgrade.
Finding your pump's exact wattage rating
The most reliable source is the pump's nameplate—a metal or plastic label attached to the motor housing. It lists the horsepower (HP) and voltage. If wattage is not printed directly, you can calculate it: multiply the horsepower by 746. A 1 HP pump uses roughly 746 watts; a 1.5 HP pump uses roughly 1,119 watts. This is the theoretical maximum; actual running wattage is usually 10 to 20 percent lower.
If you cannot find the nameplate, check your well pump manual or the paperwork from installation. If neither is available, contact the pump manufacturer with your pump model number, or ask your well contractor what they installed. Do not guess—an undersized generator or electrical upgrade will fail when you need it most.
Why shallow and deep well pumps differ
A shallow-well jet pump sits above ground and pulls water up from wells 25 feet deep or less. It is smaller and lighter, so it uses less power—typically 0.75 to 2 HP (560 to 1,500 watts). Jet pumps are cheaper upfront but less efficient over time and noisier.
A deep-well submersible pump hangs inside the well casing and pushes water up from depths of 25 feet to over 300 feet. Because it works against greater depth and pressure, it needs more power—usually 1 to 3 HP (746 to 2,238 watts). Submersible pumps are quieter, more efficient, and last longer, but cost more to install and replace.
If your well is deeper than 25 feet, you have a submersible pump. If it is shallower and the pump sits in a shed or basement, you have a jet pump. The depth is printed on your well completion report, which your county health department or well contractor can provide.
How pump cycles affect your actual power bill
Your well pump does not run 24 hours a day. It cycles on when the pressure in your storage tank drops below a set threshold (usually 30 to 40 PSI) and shuts off when pressure reaches the upper limit (usually 50 to 60 PSI). A typical household uses enough water that the pump runs 2 to 4 hours per day in total, spread across many short cycles.
This means a 1,500-watt pump running 3 hours daily uses 4.5 kilowatt-hours (kWh) per day, or about 135 kWh per month. At an average U.S. electricity rate of 14 cents per kWh, that is roughly $19 per month. Actual usage varies with household size, water habits, and seasonal demand—summer lawn watering increases cycle time significantly.
If your pump runs constantly or cycles on and off every few minutes, the pressure tank may be waterlogged or the pump may be failing. Have a well contractor inspect it; a failing pump wastes electricity and will need replacement soon anyway.
Sizing a backup generator for power outages
A generator must handle the pump's starting surge, which is 2 to 3 times the running wattage. A 1,500-watt pump needs a generator rated for at least 3,000 to 4,500 watts to start reliably. Many homeowners buy a generator sized only for running wattage and find it shuts down the moment the pump starts.
For a typical household well pump, a 5,000 to 7,500-watt portable generator is a safe choice. Permanently installed standby generators (which run on natural gas or propane) are more expensive but start automatically and run indefinitely. They are sized by an electrician based on your pump wattage and other essential loads you want to power during an outage.
Test your generator under load before you need it. Run the pump for 10 to 15 minutes to confirm it does not stall. Generators lose power over time if stored unused, so run them monthly for 15 minutes to keep the carburetor clean.
Electrical panel and circuit requirements
Most well pumps are wired to a dedicated 240-volt circuit with a breaker sized to the pump's full-load amperage. A 1.5 HP submersible pump drawing about 10 amps typically uses a 15-amp breaker and 12-gauge wire. Larger pumps (2 to 3 HP) may need 20 or 30-amp breakers and thicker wire.
If your home's electrical panel is less than 100 amps total, or if the panel is more than 40 years old, an electrician should inspect it before you replace a pump or add a new one. Older panels sometimes cannot safely accommodate a new dedicated circuit, and upgrading the main service is expensive but necessary. A 200-amp panel, standard in homes built after 1980, has no trouble with any residential well pump.
Never run a well pump on an extension cord or a shared circuit with other appliances. The voltage drop over a long cord will damage the motor, and shared circuits create fire risk. If the pump is far from the house, the electrician will run buried conduit with proper gauge wire—this is not a DIY job.
What affects pump wattage over time
A new pump uses its rated wattage. As the pump ages, internal wear and mineral buildup can make it work harder and draw more current. If your electric bill for the well jumps suddenly, the pump may be losing efficiency. A well contractor can measure the amp draw with a clamp meter and compare it to the nameplate rating.
Sediment in the well, a failing check valve, or a waterlogged pressure tank also forces the pump to cycle more often, raising total energy use. These problems are cheaper to fix than replacing the pump—a pressure tank replacement costs $300 to $800, while a new submersible pump costs $1,500 to $3,000 installed.
Hard water does not directly increase wattage, but mineral scale inside pipes and the pump can reduce flow and pressure, causing longer cycle times. Flushing the system or installing a water softener helps, but neither is urgent unless you notice low water pressure or discolored water.
Frequently Asked Questions
Can I run my well pump on a standard household outlet?
No. Most well pumps require 240 volts and draw too much current for a standard 120-volt outlet. Even a small jet pump needs a dedicated 240-volt circuit. Running it on an extension cord or undersized wire will overheat the motor and create a fire hazard.
How do I know if my pump is using too much electricity?
Compare your electric bill to previous months at the same time of year. If it jumps 20 percent or more without a change in water use, the pump may be losing efficiency. A well contractor can measure the amp draw and tell you whether the pump is failing or whether the problem is sediment, a bad check valve, or a waterlogged tank.
What size generator do I need for my well pump?
Size the generator to at least 1.5 times the pump's running wattage to handle the startup surge. A 1,500-watt pump needs a 2,250-watt minimum; a 2,000-watt pump needs 3,000 watts. For safety, round up to the next standard generator size—5,000 to 7,500 watts covers most household pumps.
Does a pressure tank reduce how often the pump runs?
Yes. The tank stores pressurized water so the pump does not start every time you turn on a faucet. A larger tank (typically 40 to 80 gallons for a household) means fewer cycles per day and lower total energy use. If your tank is undersized or waterlogged, the pump cycles constantly and wastes electricity.
Will upgrading to a more efficient pump save me money?
Modern pumps are 10 to 15 percent more efficient than pumps installed 20 or more years ago, but the savings are modest—usually $10 to $20 per month. Replacement is worth considering if your pump is over 15 years old and failing, but not as an energy-saving measure alone. Fix sediment, check valves, and tank problems first; they often restore efficiency at lower cost.