How do you maintain a well pressure tank?
Updated August 2026
The whole job on a well pressure tank is one air-charge check a year: drain the tank, then confirm the air pre-charge reads 2 psi below the pump's cut-in pressure, roughly 38 psi on a standard 40/60 switch. A tank that loses its charge goes waterlogged, and a waterlogged tank makes the pump snap on and off every few seconds, which is exactly what burns pumps out early. Keep the charge right and a bladder tank reaches its full 5 to 10 years at $200 to $500 to replace.
| Task | Interval | Effort |
|---|---|---|
| Glance at the gauge and listen as the pump cycles | Monthly | 1 min · DIY |
| Task | Interval | Effort |
|---|---|---|
| Cut power, drain the tank, read the air valve with a tire gauge | Yearly | 20 min · DIY |
| Add air to 2 psi below cut-in if it reads low | Yearly | 10 min · DIY |
| Tap the tank: hollow up top, solid at the bottom is healthy | Yearly | 2 min · DIY |
| Task | Interval | Effort |
|---|---|---|
| Replace the tank once the bladder fails | 5–10 years | $200–500 |
What neglect costs
When the bladder inside the tank fails or the air charge bleeds off, the tank can no longer hold a cushion of pressurized air, so it fills almost entirely with water. Now the pump has almost no reserve to draw from and kicks on the instant you open a tap, then off a second later, over and over. That rapid short-cycling can run a pump through a normal year of starts in a single week and cook the motor. A waterlogged pressure tank is a $300 fix that, ignored, becomes a $1,000-plus well pump. Weighing the two is covered in repair or replace.
Leave these to a pro
Checking and topping the air charge is squarely DIY: a bike pump or small compressor and a tire gauge are all it takes. Call a well pro when the tank still short-cycles after you have set the charge correctly, which points to a bad pressure switch, a failed bladder, or a pump problem, or when you would rather not pull power and drain the system yourself. A service visit runs about $100 to $250, and the tank itself lands at $200 to $500 plus an hour of labor. See the expected tank lifespan before you sink money into an old one.
This whole checklist ships as reminders in OnOtto: every task above, on the right schedule for your home, snooze-proof.
Load this checklist as remindersFrequently asked questions
How do I know if my pressure tank is waterlogged?
Two tells. Rap your knuckles up and down the tank: a healthy one sounds hollow in the top third where the air sits and dull below, while a waterlogged tank sounds solid all the way up. The louder sign is the pump cycling on and off rapidly during a steady draw like a running shower. Confirm it by checking the air charge with the tank drained. The waterlogged tank page covers the diagnosis step by step.
What pressure should my well pressure tank be set to?
Set the air pre-charge 2 psi below the pump's cut-in pressure, measured with the tank empty and the pump off. On the common 40/60 switch, cut-in is 40, so pre-charge to 38 psi. On a 30/50 system, set it to 28. Always drain the tank first or you will read water pressure, not air. The air-charge interval page has the exact procedure.
How long does a well pressure tank last?
A modern bladder or diaphragm tank lasts 5 to 10 years, sometimes 15 with a stable air charge and clean water. Old-style air-over-water galvanized tanks last longer mechanically but waterlog constantly. Sediment and frequent cycling shorten life, and a tank that has already failed once at year six tends to keep failing. See how long a pressure tank lasts for the full picture.