How to replace a well pressure tank: $400–$750 DIY

Replacing a pressure tank yourself costs $400–$750 with a box-store tank, against $800–$1,800 for a plumber to supply and install one, per supplier Mid Atlantic Water. The job is cut the power, drain and disconnect the old tank, set the new tank's air charge about 2 psi below the switch cut-in, then reconnect and test.

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Key figures

Item	Figure
Owner-installed box-store tank	$400–$750¹
Owner-installed Well-X-Trol package	$1,095–$2,195¹
Plumber labor for a straightforward swap (1 to 3 hours)	$200–$500¹
Air charge (At least; about 6 psi below on a 40/60 switch)	2 psi below cut-in^2,3

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The step that matters most

New tanks ship with a factory air charge that may not match your switch. Amtrol lists its current factory charge at 25 psi, and Pentair's Wellmate inline tanks ship at 20 psi. The Driller says the charge should be about 2 psi below the cut-in, set with the water side completely empty. Boshart, a supplier, says 2 psi is the minimum on a 20/40 switch and a 40/60 switch needs about 6 psi below, and suggests a target nearer 15 percent below cut-in to allow for gauge error and seasonal temperature change.

Sources^4,5,2,3

What a DIY swap costs

Pressure tank replacement, owner versus plumber
Route	Cost	Notes
Owner installs a box-store tank	$400–$750	Steel tanks, 20 to 44 gal
Owner installs a Well-X-Trol package	$1,095–$2,195	20 to 44 gal kits
Plumber supplies and installs	$800–$1,800	All-in
Plumber labor only	$200–$500	Plus a $75–$200 trip charge

All four rows are from Mid Atlantic Water, which sells tanks. Haul-away of the old tank runs $0–$75.

Sources¹

When to hand it off

Hire it out if the new tank needs new piping or the tank sits somewhere hard to reach. Water Well Drilling Weatherford in Texas puts difficult installs at up to about $3,500. Also call a pro if the problem is not the tank: a pump that runs and builds no pressure, or a switch that chatters with a correctly charged tank, points elsewhere. If you are buying the tank anyway, check its size against the pump first.

Sources⁶

Common questions

How long does it take?

Mid Atlantic Water puts a straightforward plumber swap at one to three hours. Expect longer on a first attempt.

Do I need to change the pressure switch too?

Not always. If the old switch has burned contacts, it is cheap to replace while the system is drained. Weatherford prices a new switch at $150–$300 installed.

For the cost of a finished well in your state, see the national well cost figures.

Sources

How Much Does a Well Pressure Tank Cost? , Mid Atlantic Water LLC (water-system supplier, nationwide). Accessed November 8, 2026. Updated 2026-10-14; prices live as of 2026-09. Tank replaced by plumber $800-$1,800 all-in (20-44 gal); labor $200-$500; submersible pump job $1,000-$2,500; tank plus pump $2,500-$5,000+. Supplier, not an installer.
Pressure Tanks , The Driller (Bob Pelikan). Accessed November 9, 2026. January 3, 2006
What PSI should a tank's pre-charge pressure be set to? , Boshart Industries (supplier knowledge base). Accessed November 9, 2026. April 1, 2024
Well-X-Trol Pressure Tanks (product page) , Amtrol (Worthington Enterprises). Accessed November 9, 2026. footer (c) 2026 Worthington Enterprises
WELLMATE WM01, WM02 In-Line Pressure Tanks datasheet , Pentair (Wellmate). Accessed November 9, 2026. PDF metadata 2012-12-06 (file revision mr14)
Well Pressure Tank Replacement Cost , Water Well Drilling Weatherford (Weatherford, TX). Accessed November 8, 2026. Published 2026-09-29, updated 2026-11-05. Pressure tank replacement $800-$1,800 installed in 2026; pressure switch $150-$300; difficult installs to about $3,500.

How these figures are built: methodology. Updated November 2026.