What an above-ground pool actually costs to run for a year

Why this page exists

We read the pages currently ranking for above-ground pool buying advice, and the split was consistent: the pages that help you choose a pool never price the season, and the pages that teach you to look after a pool never help you choose one. One of them — a well-regarded pool review site — lists “no annual cost breakdown” as a gap in its own content.

That leaves the actual question unanswered. A family at a kitchen table is not asking which pool is best. They are asking what this costs, all in, and whether they can keep up with it. This page answers that, and it does it by showing the arithmetic rather than asserting a total.

The worked example

Everything below prices one specific, common setup so the numbers are concrete: a 15-foot round frame pool holding 3,955 gallons (the published capacity of the Bestway Steel Pro MAX 15′ × 42″), run for a 120-day season at 8 hours of filtration a day. If your pool is bigger, scale the water and chemical lines directly; if your season is longer, scale the electricity line.

Line 1 — electricity, the biggest and most computable

This is the one line you can calculate exactly, because every input is either on your pump’s label or on your power bill. The formula is simply:

Which raises the obvious problem: what does your pump draw?

Here is what a season costs across the plausible range, so you can find your own row once you have read your label:

A cross-check, and an honest discrepancy

ENERGY STAR publishes two figures for pool pumps that let us derive a third. It states that an ENERGY STAR certified above-ground pool pump “use[s] 11% less energy than standard pool pumps and can save $20 a year in energy costs.” If a saving of 11% is worth $20, then the baseline is $20 ÷ 0.11.

Now notice the tension, because it is instructive. 992 kWh across our 120-day, 8-hour season would mean a pump drawing over 1,000 watts — far more than a cartridge pump on a domestic frame pool. Spread across a year-round season instead (365 days × 8 hours = 2,920 hours), the same 992 kWh implies about 340 watts, which is entirely plausible.

The most likely reading is that ENERGY STAR’s figure assumes a warm-climate pool running most of the year, not a northern pool that comes down in October. We are flagging that rather than quietly picking whichever interpretation flattered the page, because the difference between those two readings is the difference between $60 and $182 a year. If your pool is seasonal, use the table above with your own wattage. If you swim year-round, ENERGY STAR’s $182 is the better anchor.

Line 2 — water

The EPA’s WaterSense calculator uses a national average of $6.06 per 1,000 gallons. That makes the fill arithmetic trivial:

Then there is top-up. Evaporation and splash-out mean you are adding water all summer, and every gallon added is also a gallon that has to be re-balanced. We are not going to publish a national evaporation average, because the honest position is that it depends on your climate, wind exposure, sun hours and whether the pool is covered — and we could not find a figure for domestic above-ground pools we would stand behind. What we can tell you is how to measure it: mark your water line, note the date, and read it again in two weeks without topping up. That is your rate, and it is the only one that matters.

Line 3 — chemicals

Chemical spend scales with gallons and with sun. The standing cost is chlorine; shock, algaecide and pH adjusters are occasional. And unlike wattage, dosing is published: Clorox Pool&Spa’s guidance for its 3-inch chlorinating tablets is two tablets weekly per 10,000 gallons.

Scale that straight up: the 6,981-gallon Ultra XTR needs about 24 tablets over the same season — roughly 75% more, forever, for the same 17 weeks of swimming. That is the recurring price tag attached to “go one size bigger”, and it is the part of the decision that gets made at the store without anyone mentioning it.

On top of tablets, budget for: pH adjuster (trichlor tablets push pH down all season, so you will be pushing it back up), an alkalinity increaser, one or two shock treatments, and a bottle of algaecide at closing. Individually small, collectively real. The first-time owner guide is the complete shopping list.

Line 4 — consumables and the occasional big one

Filter cartridges are the recurring cost nobody includes in the purchase price. Intex’s own guidance is replacement roughly every two weeks in heavy use, with rinsing between. On a 17-week season that is a meaningful number of cartridges — and it is the strongest argument for a sand filter on a pool you intend to keep for several years, because sand lasts years and cartridges do not.

Then the occasional one: liner replacement. Rare, largely preventable, and expensive enough that it dominates any year it happens in. A ground cloth, a level base and a properly executed winter close are what decide whether you ever pay it.

Putting it together

For the worked example — 3,955 gallons, 120 days, 8 hours a day — here is the shape of a year. Two lines are computed from sourced inputs, and two are worksheet rows you complete with your own prices, because publishing a national average for them would be inventing a number.

The three things that actually move the number

1. Gallons. Everything except the pump scales with volume. The choice between a 12-foot and an 18-foot pool is a permanent decision about your annual bill, not a one-time decision about a purchase price. Our sizing guide puts that side by side.

2. Pump hours. Not pump power — hours. Compute your turnover time, run enough for two turnovers, and stop. A timer turns that from an intention into a schedule.

3. A cover. Three cost lines, one accessory. If you buy nothing else from this site, buy that.

And if this page has made the whole thing look more expensive than you expected, that is a legitimate outcome. Read are backyard pools worth it next — it argues the case against as carefully as the case for.