Does a Pool Pump Use a Lot of Electricity? What It Adds to a California Bill

Yes. ENERGY STAR says a pool pump could be your home's second-largest energy user. In California it costs more than most places, because the residential price here is almost twice the U.S. average. How much it adds depends on three things you can control: the pump's speed, how many hours it runs and which hours those are.

Pumps differ too much to quote one wattage for all of them, so this page shows the cost per kilowatt of pump power on each large California utility's 2026 prices. Find the input watts on your pump's label or in its manual, or ask your pool service, and multiply. Every price is from the utility's own rate table, checked on September 23, 2026.

Why a pool pump uses so much

A pump runs for hours every day, often all year. The waste comes from speed. A conventional single-speed pump runs at the high flow needed for pool cleaning, but filtration, a pump's main job, needs only about half that flow. ENERGY STAR explains the physics: cutting pump speed in half cuts its power to about one-eighth. So a single-speed pump spends most of its hours using far more power than the task needs.

ENERGY STAR-certified in-ground pumps use 18% less energy than standard ones by its 2022 fact sheet, and a variable-speed model saves more the lower its filtering speed is set, because of that one-eighth rule. Pool cleaners matter as well. ENERGY STAR cites a PG&E study in which a cleaner powered by a booster pump used 2,989 kWh a year and one powered by the filter pump 1,675 kWh, against 197 kWh for a robotic cleaner. At PG&E's 39.94-cent summer off-peak price, 2,989 kWh is about $1,194 a year and 197 kWh about $79.

What each kilowatt costs per month in California

The table prices 240 kWh, which is 1 kW of pump power running 8 hours a day for 30 days, at each utility's cheapest summer hour and its summer peak. Scale it to your pump: a 1.5 kW pump is 1.5 times these figures, and 12 hours a day is 1.5 times again.

The gap between the two columns is the cost of running the pump at the wrong time. On SDG&E it is $76.08 a month for each kilowatt, simply from the clock. On a tiered plan such as PG&E's E-1 or LADWP's R-1A, the hour does not change the price, but a pump's kWh can push the rest of the home's use into the higher tier.

When to run a pool pump in California

Pick hours outside your plan's peak window. On PG&E's E-TOU-C, SCE's TOU-D-4-9PM and SDG&E's TOU-DR1, that means anything but 4 to 9 p.m. SDG&E's cheapest super off-peak hours are midnight to 6 a.m. and 10 a.m. to 2 p.m. on weekdays, and midnight to 2 p.m. on weekends and holidays. SMUD's peak is 5 to 8 p.m. on weekdays; on summer weekdays its off-peak price runs from midnight to noon, and weekends are off-peak all day. LADWP names a filtered swimming pool as one of the loads to move to 8 p.m. to 10 a.m. on weekdays, or any time on weekends, if you are on its time-of-use plan. Our peak hours by utility guide has every window in one place.

If you have rooftop solar, the midday hours when the panels produce most are usually the best time to filter, since the pump then uses your own power rather than power bought at evening prices.

Run it fewer hours, and slower

ENERGY STAR points out that running the filter 6 hours a day instead of 24 cuts its energy use by 75%, and that a timer running several short cycles can keep the pool clean all day. Its installation guidance sets a pump's minimum speed at one that still turns over the pool's full volume in 12 hours. Ask your pool service to set the lowest speed and fewest hours that keep the water clear, then check the bill after a month.

Replacement pumps have to be efficient. A federal standard covers dedicated-purpose pool pumps manufactured from July 19, 2021, with minimum efficiency ratings for filter pumps in 10 CFR 431.465. The same rule makes a pump with freeze protection ship with conservative defaults: it switches on at no more than 40°F, runs no more than an hour before rechecking, and at no more than half its maximum speed. Check those settings if a winter bill looks high.

Where a pool fits in a high bill

If your bill jumped the month the pool opened, the pump is a likely cause. Divide the bill's kWh by the days in the period and compare with the same month last year, as our high-bill checklist explains. Heating the water is a separate and often larger cost; our solar pool heating guide covers that. And if you are comparing plans, the rate lookup by address shows your utility's standard prices.