A typical household well pump uses between 0.5 and 2 kilowatts when running, and costs roughly $10 to $30 per month to operate

The actual power draw depends on three things: the pump's horsepower rating, how deep your well is, and how often the pump cycles on and off. A shallow well with a 0.75 horsepower pump might use 500 to 750 watts. A deep well with a 2 horsepower pump could draw 1,500 to 2,000 watts. The pump doesn't run constantly—it cycles on when water pressure in your tank drops and shuts off once pressure builds back up. How often that happens depends on your household's water use and the size of your pressure tank.

To estimate your monthly cost, multiply your pump's wattage by the hours it runs per month, divide by 1,000, then multiply by your local electricity rate. If your pump draws 1,000 watts and runs 8 hours per day, that's 240 kilowatt-hours per month. At an average U.S. rate of $0.13 per kilowatt-hour, that's about $31 per month. Rates vary significantly by region and utility company, so check your electric bill for your actual rate.

Key Takeaways

  • Most household well pumps draw between 500 and 2,000 watts depending on depth and horsepower rating.
  • Monthly operating cost typically falls between $10 and $30, but varies based on local electricity rates and how often your pump cycles.
  • A pressure tank reduces how often your pump runs by storing water, which lowers your power bill.
  • You can find your pump's wattage on the nameplate attached to the motor or in your well system documentation.

Finding your pump's actual power rating

The most reliable way to know how much power your pump uses is to look at the nameplate—a metal or plastic label bolted to the motor itself. It lists the horsepower, voltage, and amperage. If you have a 1 horsepower pump at 240 volts, multiply the amps listed on the nameplate by the voltage to get watts. A 1 HP pump typically draws 8 to 10 amps, so 10 amps × 240 volts = 2,400 watts at startup (though it settles to lower wattage once running).

If you can't find the nameplate or it's worn away, check your well system paperwork or the invoice from when the pump was installed. The contractor or well company should have documented the pump model and horsepower. You can also call a local well service company with your pump model number and they can tell you the typical power draw.

Don't rely on horsepower alone to calculate watts. A 1 HP pump doesn't always equal 746 watts—efficiency varies by pump type and age. A submersible pump (the most common type in residential wells) is usually more efficient than a jet pump, so two 1 HP pumps may use different amounts of power.

How pump cycles affect your monthly bill

Your pump doesn't run all day. It cycles on when water pressure in your pressure tank drops below a set point (usually around 40 pounds per square inch) and shuts off once pressure reaches the upper limit (usually around 60 PSI). The time between cycles depends on how much water your household uses and the size of your tank.

A household that uses 50 gallons per day might have the pump run for 2 to 4 hours total per day, spread across multiple short cycles. A household using 150 gallons per day might run the pump 6 to 10 hours per day. If your pump draws 1,000 watts and runs 5 hours per day, that's 5 kilowatt-hours per day, or about 150 kilowatt-hours per month.

A larger pressure tank reduces cycling frequency because it stores more water between pump starts. If you're concerned about high power bills, a well service technician can check your tank size and pressure settings to see if adjustments would help. Sometimes a tank is undersized or the pressure switch is set too tight, causing unnecessary cycling.

Comparing submersible and jet pump power use

Submersible pumps (which sit inside the well) are the standard in most new residential wells and typically use less power than jet pumps for the same depth. A 1 HP submersible pump usually draws 750 to 1,000 watts. They're more efficient because they don't have to lift water as far through the discharge line.

Jet pumps (which sit above ground) are common in older wells and shallow wells. A 1 HP jet pump typically draws 1,200 to 1,500 watts because it has to create more pressure to pull water up from depth. If you have a jet pump and your electric bill seems high, a submersible pump might reduce power use by 20 to 30 percent, though the upfront cost of replacement is significant.

The depth of your well also matters. A submersible pump pulling water from 100 feet down uses less power than one pulling from 300 feet. If you know your well depth, a well contractor can estimate the power draw more accurately than a general rule of thumb.

Seasonal variation in pump runtime

Well pump power use often changes with the seasons. In summer, when outdoor watering and higher household water use peak, your pump runs more frequently and your bill climbs. In winter, when water use typically drops, the pump cycles less often and power consumption falls.

If you water a lawn or garden from your well, that adds significant runtime. A typical lawn irrigation system can use 1,000 to 2,000 gallons per day during the growing season. If your pump draws 1,500 watts and runs an extra 4 hours per day for irrigation, that's 6 kilowatt-hours per day just for watering—roughly $25 per month in added electricity cost during summer months.

Tracking your electric bill month to month will show you this pattern. If your bill spikes in June and July but drops in November and December, seasonal water use is the likely cause. This is normal and expected for well owners.

When high power use signals a problem

If your electric bill jumps suddenly without a change in household water use, your pump may have a problem. A worn pump or a leak in the pressure tank can cause the pump to cycle constantly, running far more than normal. If the pump is running almost continuously, stop using water and call a well service technician—the system needs inspection.

A failing check valve (which prevents water from flowing backward into the well) can also cause constant cycling. The pump pressurizes the tank, shuts off, but then water leaks back through the check valve, dropping pressure and triggering the pump to start again when ready. This creates a cycle every few minutes instead of every few hours.

Air leaks in the pressure tank or discharge line can also cause problems. If air escapes from the tank, water fills the space, pressure drops faster, and the pump cycles more frequently. A well service technician can pressurize the tank with an air compressor to restore the air charge, which usually costs $100 to $200 and can noticeably lower your power bill.

Estimating your annual well pump cost

To project your yearly power bill for the well pump, take your average monthly cost and multiply by 12. If your pump costs $20 per month to run, that's $240 per year. Over a 20-year pump lifespan, that's $4,800 in electricity—a real cost to factor in if you're comparing well water to municipal water or considering a pump upgrade.

If you're building a new well or replacing a pump, ask the contractor for an estimated power draw and runtime. A 1 HP submersible pump in a 150-foot well serving a family of four typically costs $15 to $25 per month to operate. A 2 HP pump serving a larger household or deeper well might cost $30 to $50 per month. These are rough ranges—your actual cost depends on your utility rate and water use.

Keeping your well system maintained—having the pressure tank inspected every few years, checking the pressure switch setting, and replacing a worn pump before it fails—helps keep power use in the normal range. A pump that's struggling to push water uses more electricity than one in good condition.

Frequently Asked Questions

Can I run my well pump on solar power?

Yes. A submersible pump drawing 1,000 watts for 5 hours per day needs about 5 kilowatt-hours of solar generation. A typical residential solar system sized for this would cost $8,000 to $15,000 before incentives. Some well owners install a smaller solar array to offset part of the pump's power use rather than cover it entirely. A well service company can help size a solar system for your specific pump and water use.

Why does my pump use more power in winter?

Cold water is denser and requires slightly more energy to pump, but the difference is small. If your winter bill is noticeably higher, the cause is usually increased indoor water use (longer showers, more laundry) rather than the pump itself. Check your household water use patterns to confirm.

How much does it cost to replace a well pump?

A submersible pump replacement typically costs $1,500 to $3,500 installed, depending on well depth and pump size. A jet pump replacement costs $800 to $2,000. Labor makes up most of the cost. If your pump is more than 15 years old and your power bill has risen, replacement might pay for itself in lower electricity costs over time, though this depends on your specific situation.

Should I turn off my well pump when I'm away?

No. Turning off the pump and then restarting it can damage the motor and pressure tank. If you're away for an extended period and want to save power, have a well service technician adjust the pressure switch to a lower setting temporarily, or straightforward accept the small cost of the pump maintaining pressure in an empty house.

What's the difference between kilowatts and kilowatt-hours on my electric bill?

Kilowatts (kW) is power—how much electricity the pump uses at any moment. Kilowatt-hours (kWh) is energy—kilowatts multiplied by hours of use. Your electric bill charges you for kilowatt-hours, not kilowatts. A 1,000-watt pump running for 5 hours uses 5 kilowatt-hours.