Ownership costs

What Pool Maintenance Really Costs Per Year

Electricity, chemicals, openings and closings, service plans, and the repair reserve nobody budgets for — a realistic annual picture.

Robotic pool cleaner at the edge of a pool
Stock photography for illustration. A robotic cleaner is a one-time purchase that trades money for weekends — one of several honest tradeoffs in this budget.

The short answer

For a self-maintained inground pool in the St. Louis area, a realistic planning budget is the low thousands of dollars per year — most owners land somewhere around $1,750 to $4,800 across all categories before optional cleaning service. Add weekly professional service during the season and the total commonly moves into the $3,500 to $8,000 range. Here is where it goes, line by line, using the same ranges as our cost guide.

Electricity: the quiet big one

Your pump runs the pool. A modern variable-speed pump, run longer at low speed, filters better for a fraction of the electricity of an old single-speed pump run at full blast — this is the single largest controllable cost difference between two otherwise identical pools. Heating is the wildcard: a heat pump stretching the season in spring and fall adds moderately; a gas heater cranked for a warm pool in April adds enthusiastically. Budget roughly $600–$1,800 a year for pump and heating electricity/fuel combined, with unheated, variable-speed pools at the bottom.

Chemicals and sanitation: $250–$700 a year

Chlorine, pH adjustment, alkalinity, stabilizer, algaecide, and test supplies. Salt-system owners spend less on purchased chlorine but should reserve for a replacement salt cell every several years — it averages out to a similar place with less hauling and handling. The most expensive chemical program is the neglected one: recovering a swamp costs more in chemicals, time, and filter media than a season of staying ahead of it.

Water: $100–$400 a year

Evaporation in a St. Louis summer, splash-out, backwashing, and the occasional partial refill. An automatic cover is the biggest reducer here — it also cuts heating and debris, which is why its five-figure price sometimes pencils out over a long ownership. Leak ignored, this line quietly becomes the biggest one; a pool losing water faster than evaporation explains is telling you something.

Opening and closing: $500–$900 a year

Professional spring opening and fall winterization, bought as a pair. In Missouri this is not a cosmetic service: closing is freeze protection (see the winterizing guide). Owners who DIY save this money and take the freeze risk personally — a fair trade only if you genuinely know the sequence.

The repair reserve: $300–$1,000 a year

Seals, o-rings, gauges, cleaner parts, a valve here, a sensor there. Pumps, heaters, and salt cells also have finite lives measured in years, and the owners who are never surprised by a four-figure equipment year are the ones who reserved for it annually. Treat this line as rent you pay your future self.

Optional: professional service at $1,800–$3,600 a season

Weekly or biweekly cleaning, brushing, chemistry, and equipment checks during the swim season. What you are buying is weekends and consistency — pools on service tend to have steadier chemistry and earlier-caught problems. What you are not buying is immunity from the other lines: electricity, water, opening/closing, and repairs still apply.

Costs that are real but not annual

Spread across the years between events, these add a few hundred dollars a year to true ownership cost. Honest budgeting includes them; sales brochures rarely do.

Budgeting the whole picture?

Build cost plus ownership cost is the real number. Run the calculator for the build, then come back to this page for the years after.

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