How Much Does a Pond Pump Cost to Run? (2026 Data)

A 100-watt pond pump running 24 hours a day uses about 72 kWh a month. At the US average rate of 18.05 cents per kWh from the EIA Electric Power Monthly, that is about $13 a month and just under $156 a year. A modern refrigerator costs roughly $5 to $8 a month to run. A microwave used daily costs around 50 cents. The pump out-spends both, on a fraction of their peak wattage.

The reason is runtime, not power. A microwave pulls more than ten times the watts of this pump, but it runs five minutes a day. The pump runs every minute of every day. Cost is watts multiplied by hours, and the pump wins the hours by a mile. Once a device is on around the clock, even a small wattage turns into a real line on the bill.

That also makes the pond pump one of the few household loads where the exact wattage matters less than how long and how hard you run it. For a pump that never cycles off, the monthly figure usually lands above the fridge, which surprises most owners the first time they work it out.

Pond pumps span a wide wattage range, and the monthly cost scales straight with it. The figures below assume continuous running at the US average rate.

Small decorative or fountain pump (40 to 100 watts): $5 to $13 a month. This covers tabletop fountains and small water features. Medium koi or garden pond pump (200 to 400 watts): $26 to $52 a month. The typical fish-pond workhorse. Large pond or waterfall pump (600 to 1,500 watts): $78 to $195 a month. Big waterfalls and stream features that move thousands of gallons an hour.

At the top of that range a pond pump rivals or beats a pool pump, which runs $40 to $80 a month on a typical seasonal schedule. The difference is that a pool pump usually runs 8 to 12 hours a day in summer and shuts off in winter. A fish-pond pump runs every hour of the year. Over twelve months, a 600-watt waterfall pump can cost more to run than the pool it sits next to.

Pond pumps are sold by flow, in gallons per hour, not by power. The GPH number on the box is not the wattage and does not belong in the cost math. The figure you want is on the pump's nameplate or in the manual, listed in watts. If only amps are printed, multiply amps by 120 to get watts on a standard US outlet.

As a rough guide when the label is gone, mag-drive pond pumps draw somewhere around 0.05 to 0.08 watts per gallon-per-hour at low lift. A 1,000 GPH pump lands near 60 to 100 watts, a 3,000 GPH pump near 200 to 350. Lift height changes this, since pushing water up a tall waterfall pulls more power than circulating it flat. The nameplate is always the better number when you have it.

The biggest lever is pump speed. Pumps follow the affinity laws: cut the speed in half and the power drops to about an eighth, because power rises with the cube of speed. A variable-speed pump dialed back to half throttle draws a small fraction of what it does wide open. You usually run it longer to turn the water over the same number of times, so real savings land around 50 to 70 percent rather than the full seven-eighths. On a 300-watt pond that is the difference between $39 a month and roughly $12 to $20.

Season is the second lever. A purely decorative fountain can be shut off entirely for the four or five coldest months, which trims annual cost by 33 to 40 percent. Fish ponds are different. Koi and goldfish need water movement, or at least a de-icer, through winter, so the move there is to drop to a smaller circulation pump or a lower setting rather than going dark. Even halving winter flow takes a meaningful slice off the yearly total.

Pump type matters too. Energy-efficient asynchronous or hybrid-drive pumps use 30 to 50 percent less than older mag-drive motors for the same flow. On an always-on pond, that gap is 200 to 400 kWh a year, or $35 to $70 at the average rate. The pump that costs more up front is often the cheaper one to own by the second summer.

Wattage and runtime set the kilowatt-hours. Your state rate sets the dollars. A 300-watt pond pump running 24/7 uses about 216 kWh a month everywhere. Only the local rate changes the cost:

Louisiana (12.44¢/kWh): $27. Texas (14.80¢/kWh): $32. US average (18.05¢/kWh): $39. New York (24.40¢/kWh): $53. California (31.01¢/kWh): $67. Hawaii (39.79¢/kWh): $86.

The same pump costs a Hawaii owner more than three times what it costs in Louisiana, for identical water movement. If your rate sits on the high end, the speed and season levers are worth more to you than to someone paying twelve cents. Every state's 2026 figure is in the state rates guide.

For a small fountain, the answer is simple. Five to thirteen dollars a month is real money across a year, but it will not be the reason a bill spikes. A tabletop fountain as your only water feature is not worth a second thought.

A large koi pond with a waterfall is a different story. At $80 to $195 a month in season, a big pump can be the second or third largest single load in the house, behind cooling and the heavy appliances on the most expensive appliances list. If your summer bill climbed and you added a pond this year, the pump is a prime suspect. Move it to a variable-speed model on a lower setting and the savings show up on the next cycle.

To put a number to your own setup, the pond pump calculator takes your pump's wattage off the nameplate, your run hours, and your local rate, and returns the monthly and yearly cost. For a pump that runs all year, that figure is worth knowing before the bill arrives.