A typical household well pump uses 300 to 2,000 kilowatt-hours per month

The actual amount depends on three things: how deep your well is, how much water your household uses, and what kind of pump you have. A shallow well with a small submersible pump serving two people might use 300 to 500 kWh monthly. A deep well serving a family of six could easily reach 1,500 to 2,000 kWh. The only way to know your own pump's consumption is to check your electric meter before and after a full month of normal use, or to look at your utility bill if the pump is on a separate circuit.

Most well pumps run on either 120 volts or 240 volts. A 240-volt pump is more efficient and more common in homes with deeper wells. The pump itself might be rated anywhere from 0.5 horsepower to 2 horsepower or higher. A larger motor does not automatically mean higher monthly bills—a 1.5 HP pump that runs for short bursts uses less power than a 0.75 HP pump that runs constantly because the pressure tank is too small.

Key Takeaways

  • Monthly electricity use for a well pump typically falls between 300 and 2,000 kilowatt-hours, depending on well depth, household size, and pump size.
  • A pressure tank that is properly sized and maintained reduces how often the pump cycles on and off, which directly lowers your monthly power bill.
  • You can estimate your pump's monthly cost by multiplying its horsepower by 750 watts, then dividing by your local electricity rate per kilowatt-hour.
  • Submersible pumps (inside the well) are more efficient than jet pumps (above ground), so they typically cost less to run each month.
  • A failing pressure tank or a slow leak in your plumbing will cause the pump to run more often, raising your electric bill noticeably.

How pump size and well depth affect monthly usage

A horsepower rating tells you the motor's power output, but not how long it runs. A 1 HP pump uses roughly 750 watts when it is actively pumping. If that pump runs for 8 hours in a month, it consumes about 6 kilowatt-hours. If it runs for 40 hours, it consumes 30 kilowatt-hours. The depth of your well determines how hard the pump must work to lift water to your house, which affects both how long each pumping cycle lasts and how often the pump turns on.

A shallow well (under 25 feet) with a jet pump or small submersible might cycle on for 2 to 5 minutes every few hours. A deep well (over 100 feet) with a larger submersible pump might cycle on for 10 to 20 minutes each time because it takes longer to refill the pressure tank. Over a month, those longer cycles add up. A household using 100 gallons per day from a 50-foot well will see higher monthly consumption than a household using the same 100 gallons from a 25-foot well, all else equal.

Why your pressure tank matters more than you think

The pressure tank is the metal cylinder that stores water under pressure so the pump does not have to run every time you turn on a faucet. A tank that is properly sized and properly pressurized might allow the pump to run only 4 to 6 times per day. A tank that is too small, or one that has lost its air charge, might force the pump to run 10 to 15 times per day for the same household water use.

Each time the pump cycles on, it draws a surge of current and runs until the tank pressure reaches its cut-off point. A waterlogged tank (one that has lost its air cushion and filled with water) means the pump runs longer and more often. You can check your tank by tapping it with your knuckles—the top half should sound hollow and the bottom half should sound solid. If the whole tank sounds solid, or if water sprays out when you open the drain valve at the bottom, the tank needs to be serviced or replaced. Fixing a failed tank can cut your monthly electric bill by 20 to 30 percent.

Calculating your pump's monthly cost

To estimate what your pump costs to run each month, you need three numbers: the pump's horsepower, the number of hours it runs per month, and your local electricity rate. Start by finding your pump's horsepower on the motor nameplate (usually on a sticker attached to the pump or pressure tank). Multiply that by 750 to get watts. Then multiply watts by the hours the pump runs per month, and divide by 1,000 to get kilowatt-hours.

For example: a 1.5 HP pump running 30 hours per month in a home where electricity costs $0.14 per kilowatt-hour would cost about $4.73 per month. The math is (1.5 × 750 × 30 ÷ 1,000) × $0.14 = $4.73. Your actual bill will vary because the pump does not run at exactly 750 watts per horsepower—efficiency losses mean real consumption is often 10 to 20 percent higher. The best way to know your true consumption is to read your electric meter at the same time each month, or to ask your utility company whether they can isolate the well pump on a separate meter.

Signs your pump is using more power than it should

If your electric bill spiked suddenly and nothing else in your home changed, your well pump is likely running more often than before. The most common cause is a slow leak in your plumbing—a dripping toilet, a leaking outdoor faucet, or a crack in a buried water line. Even a leak that loses only 5 gallons per day will force the pump to cycle on an extra 2 to 4 times per day, which adds 20 to 40 kWh per month to your bill.

A second common cause is a failing pressure tank. As described above, a tank that has lost its air charge will cycle the pump much more frequently. A third cause is a pump that is starting to fail—worn impellers or a failing check valve can make the pump less efficient, so it runs longer to deliver the same amount of water. If you suspect any of these problems, turn off the pump and check for leaks by looking at your water meter. If the meter is moving when no water is running in the house, you have a leak. Call a well service company to inspect the tank and pump.

Submersible versus jet pumps and their power use

A submersible pump sits inside the well, submerged in water. It pushes water up through a single pipe to the house. A jet pump sits above ground, usually in a basement or pump house, and uses suction to draw water up from the well. Submersible pumps are more efficient because they do not have to fight gravity as hard—the water is already around them. Jet pumps have to work harder, especially if the well is deep, so they typically consume 15 to 25 percent more electricity per gallon of water delivered.

If you have an older jet pump and are considering replacement, switching to a submersible pump could lower your monthly electric bill noticeably. A new submersible pump also tends to be quieter and requires less maintenance. The upfront cost is higher, but the energy savings and longer lifespan often pay back the investment within 5 to 10 years, depending on your local electricity rates and how much water your household uses.

Seasonal changes in well pump electricity use

Most households see higher well pump electricity use in summer than in winter. Outdoor watering, filling pools, and washing vehicles all increase water demand. If you water a lawn or garden, that alone can add 500 to 1,000 gallons per week during dry months, which translates to 50 to 100 extra kWh per month. Winter use is typically lower because there is no outdoor watering and household water use often drops slightly.

If you notice your electric bill is much higher in one month than others, check whether you had unusual water use—a house guest, a leak, or outdoor watering. Comparing your bills month to month will show you the normal range for your pump and help you spot problems early. Most utilities provide a 12-month history on their website or app, so you can see your pattern over a full year.

Frequently Asked Questions

How many hours per day does a well pump typically run?

Most household well pumps run between 2 and 8 hours per day, depending on household size, water use, and well depth. A family of four with a properly functioning pressure tank might see 4 to 6 hours of pump runtime daily. A smaller household or one with a larger tank might see only 2 to 3 hours. If your pump is running more than 10 hours per day, you likely have a leak or a failing pressure tank.

Can I reduce my well pump's monthly electricity use?

Yes. Fix any leaks in your plumbing, have your pressure tank serviced to restore its air charge, and consider upgrading to a variable-speed submersible pump if your current pump is old. Variable-speed pumps adjust their motor speed to match demand, using 30 to 50 percent less energy than fixed-speed pumps. You can also reduce water use by fixing leaky toilets and faucets, which lowers how often the pump cycles on.

What does it cost to run a well pump for a year?

A typical household well pump costs between $36 and $240 per year to operate, depending on pump size, well depth, water use, and local electricity rates. A small pump in a shallow well might cost $30 to $50 annually. A large pump in a deep well serving a big household might cost $150 to $300 annually. Multiply your monthly kilowatt-hour estimate by 12 and by your local rate per kilowatt-hour to find your own annual cost.

Is a submersible pump worth the cost to install?

If you currently have a jet pump and your electric bills are high, a submersible pump can pay for itself in 5 to 10 years through lower energy use. Submersible pumps are also more reliable and quieter. The installation cost varies widely by region and well depth, so get quotes from local well service companies before deciding. If your current pump is new and working well, replacement is not necessary.

Why did my well pump electric bill double suddenly?

A sudden spike almost always means a leak in your plumbing or a failing pressure tank. Check your water meter to see if it moves when no water is running in the house. If it does, you have a leak. If the meter is still, have a well service company inspect your pressure tank and pump. Both problems are fixable and will bring your bill back down once repaired.