Cost guide
Well Pressure Tank Replacement Cost: Prices by Size, Labor and What to Ask
Most replacements land between $800 and $1,500. The size you need — and therefore the price — depends on your pump, not on how many people live in the house.
On this page
HomeGuide puts the average cost to replace a well pressure tank at $800 to $1,500, tank and professional labor included, with a national average of $1,000 and a full range from $450 to more than $3,000.[1] Tank size is the biggest factor: a 20-gallon tank costs $450 to $1,000 installed, an 80-gallon tank $850 to $2,300. Labor alone runs $250 to $500 or more.
How to read these numbers
These are national ranges published by a cost-guide company on July 25, 2025. They are not quotes and not our own survey. Use them to sanity-check a quote, not to predict it to the dollar.
Cost by tank size — and what each size delivers
The first three columns are HomeGuide's.[1] The last two are ours: the usable water between pump starts on a 40/60 switch, calculated with the Boyle's-law method published in The Driller with a precharge of 38 psi,[2] and the pump flow that amount of water supports for a one-minute run.
| Total volume | Tank only | Installed | Usable water at 40/60 | Supports a pump up to |
|---|---|---|---|---|
| 20–29 gal | $200–$500 | $450–$1,000 | 5–7 gal | 5–7 GPM |
| 30–39 gal | $300–$850 | $550–$1,350 | 8–10 gal | 8–10 GPM |
| 40–59 gal | $350–$1,100 | $600–$1,600 | 10–15 gal | 10–15 GPM |
| 60–79 gal | $500–$1,300 | $750–$1,800 | 15–20 gal | 15–20 GPM |
| 80–99 gal | $600–$1,800 | $850–$2,300 | 21–26 gal | 21–26 GPM |
| 100–119 gal | $850–$2,000 | $1,100–$2,500 | 26–31 gal | 26–31 GPM |
| 120–139 gal | $900–$2,500+ | $1,150–$3,000+ | 31–36 gal | 31–36 GPM |
The last column uses the one-minute minimum run time that Franklin Electric gives for its submersible motors and that Water Well Journal uses for pumps under 2 HP; pumps of 2 HP and above are sized for two minutes, which halves the figure.[3][4] At a 30/50 setting the same tank delivers about 14% more water.
The practical point: a "40-gallon" tank gives you about 10 gallons, not 40. If your pump delivers 12 GPM, the cheapest tank on the list is the wrong tank at any price. Work out your size with the tank size calculator before comparing quotes.
What moves the price
- Tank size
- HomeGuide calls it the biggest factor.[1] Larger tanks cost more to buy and to handle, but they cut the number of pump starts.
- Tank type
- Diaphragm and bladder tanks keep air and water apart. Air-over-water tanks are the most basic and cheapest, but HomeGuide notes they need more maintenance because the air gradually dissolves into the water.[1] More in types of well tanks.
- Labor
- $250 to $500 or more for the tank swap; plumbers charge $75 to $150 an hour on average, more for emergency calls.[1] Rerouting pipe or replacing other components adds time.
- Access
- A tank in an open basement or utility room is cheaper to replace than one in a cramped crawl space. Buried tanks cost more again, since they may need digging.[1]
- What else is replaced
- A new pressure switch or gauge adds $150 to $200 each as a stand-alone job, usually less when done with the tank.[5]
Tank price vs. installed price
Comparing HomeGuide's two columns, installation adds roughly $250 at the low end of each size and $500 at the high end — the same as its labor range.[1] That tells you two things. A quote far above "tank price + $500" should come with an explanation: a new tank tee, a switch, pipe changes, difficult access. And the tank itself is most of the bill on larger sizes, so the brand and model on the quote are worth checking against retail prices.
Before deciding to save the labor, read the warranty. Amtrol's manual says its tanks must be installed by a licensed professional and that not following the instructions voids the warranty.[6]
First, make sure you need a new tank
A tank that has only lost some air can often be reset for the price of a service call; a tank with water at its air valve or rust on its shell cannot. The five tank checks tell them apart, and several other faults — a leaking check valve, a clogged switch port — mimic a bad tank. If the diagnosis was "your pump is short cycling, you need a tank," ask which of those checks was done.
What a tank quote should say
Quote checklist
- Brand, model and total volume of the tank, and its drawdown at your switch setting.
- How the size was chosen — from the pump's flow, or just matched to the old tank?
- The precharge that will be set and the pressure switch setting.
- Whether the tank tee, pressure switch, gauge and relief valve are included.
- Removal and disposal of the old tank.
- Warranty on the tank and on the labor, in writing.
HomeGuide's general advice applies here as anywhere: get at least three quotes and confirm the company is licensed and insured.[1]
How long the new tank should last
HomeGuide reports 10 to 15 years on average, depending on water quality, use and maintenance.[1] Tank makers we've read don't publish a service life; Amtrol's WX models carry a seven-year limited warranty, and its manual notes that water quality can significantly influence a tank's life.[6] Spread over a dozen years, a $1,000 replacement is around $80 a year — small next to the cost of a pump worn out by a tank that was too small or left waterlogged.
Sources
- HomeGuide. How Much Does It Cost to Replace a Well Pressure Tank? (article dated July 25, 2025). Accessed Oct. 8, 2026.
- The Driller. How to Calculate and Control Pressure Tank Drawdown — Bob Pelikan (Feb. 1, 2006). Accessed Sept. 28, 2026.
- Franklin Electric. Submersible Motors: Application, Installation & Maintenance (AIM) Manual, 60 Hz. Accessed Sept. 28, 2026.
- Water Well Journal. Tank Selection by the Numbers — David L. Kill, PE (April 19, 2022). Accessed Sept. 28, 2026.
- HomeGuide. How Much Does Well Pump Repair Cost? (article dated Aug. 6, 2025). Accessed Oct. 8, 2026.
- Amtrol. Well-X-Trol Residential Pre-Pressurized Well Tanks — Installation & Operation Instructions (WX-101 through WX-350). Accessed Sept. 28, 2026.
We cite manufacturer documentation and public agencies first. Read how we choose and check sources.