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Fix a pressure tank that waterlogs

We'll confirm the tank is waterlogged, check the bladder and air pressure, then add air or replace the tank—or tell you when to call a pro.

Troubleshooting · Home maintenance
15–45 min
What you'll need
  • Tire pressure gauge
  • Tire pump or compressor (for adding air)
  • Replacement pressure tank (if bladder has failed)
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Steps

Goal: Confirm the tank is waterlogged, check the bladder and air pressure, then add air or replace the tank.

  • Listen at the pressure tank when you use water. If the pump turns on and off rapidly (short cycling), the tank may be waterlogged.
  • Tap the tank with your knuckle. A good tank sounds hollow at the top; a waterlogged tank sounds full or dull.
  • Good: Pump short cycles or tank sounds full—proceed to Check air pressure.
  • Bad: Pump runs normally and tank sounds hollow—different issue.

Tap the tank

Goal: Quickly check if the tank sounds waterlogged.

  • Tap the pressure tank with your knuckle. A properly charged tank sounds hollow when you tap the top half.
  • A waterlogged tank sounds full, dull, or solid—no hollow sound.
  • Good: Tank sounds full—waterlogged. Proceed to Check air pressure.
  • Bad: Tank sounds hollow—check the pressure switch or other causes.

Check air pressure

Goal: Check and restore air pressure. If the bladder has failed, the tank will not hold air.

  • Shut off the pump at the circuit breaker. Open a hose bib to drain the tank.
  • Press a tire gauge onto the Schrader valve. The air pressure should match cut-in minus 2 psi (e.g. 28 psi for 30/50 switch).
  • If pressure is low, add air with a tire pump or compressor. Restore power and run water.
  • Good: Tank holds air and pump cycles normally. Fix complete.
  • Bad: Tank will not hold air—bladder failed. Replace the tank or call a pro.

When to get help

Call a well professional if:

  • The tank will not hold air after adding it.
  • The tank is leaking.
  • You need to replace the tank and are not comfortable with plumbing.
  • The pump still short cycles after your fix.

Verification

  • The pump runs for a minute or more before cutting off when you use water.
  • The tank sounds hollow when you tap the top half.
  • Air pressure at the Schrader valve matches cut-in minus 2 psi.
  • No pressure surges at fixtures.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm symptom Verify short cycling or pressure fluctuation.
  2. Tap the tank Tap the tank—hollow means good; dull or full means waterlogged.
  3. Check and add air Drain, check pressure, add air to cut-in minus 2 psi.
  4. Replace tank If the tank will not hold air, replace it.
  5. Call a pro Tank replacement or pump still short cycles—call a well professional.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Pressure switch settings (cut-in/cut-out)
  • Tank sound when tapped (hollow or full)
  • Air pressure reading at Schrader valve
  • Whether the tank holds air after adding
  • Steps already tried

Is the pump short cycling or does the tank sound full when tapped?

Short cycling means the pump turns on and off rapidly. Tap the tank—a waterlogged tank sounds dull or full.

Listen at the tank when you use water. Tap the tank with your knuckle. Good: pump cycles too often or tank sounds full—waterlogged. Bad: pump runs normally and tank sounds hollow—different issue.

Yes No

You can change your answer later.

Does the tank hold air after draining and adding it?

Drain the tank, add air to cut-in minus 2 psi, restore power. If the tank holds air and cycles normally, the fix worked.

Shut off the pump and drain the tank. Add air at the Schrader valve to cut-in minus 2 psi. Restore power and run water. Holds air: fix worked. Does not hold: bladder failed—replace the tank.

Yes No

You can change your answer later.

Fix complete

The tank holds air and the pump cycles normally. Monitor for a few days to confirm the fix holds.

Done

Replace the pressure tank

The bladder has failed. Replace the tank with one of the same or larger size. Pre-charge to cut-in minus 2 psi. Call a well pro if you are not comfortable with plumbing.

Done

Call a well professional

Call a well professional if the tank will not hold air, the tank is leaking, you need to replace the tank, or the pump still short cycles after your fix.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a pressure tank waterlog?
The bladder or diaphragm inside the tank can fail, allowing water to fill the air side. Once waterlogged, the tank cannot absorb pressure changes—the pump cycles on and off rapidly (short cycling) and pressure fluctuates.
Can I fix a waterlogged pressure tank myself?
You can check the tank by tapping it and testing air pressure. You can try adding air—if it holds, the tank may recover. If the bladder has failed, the tank must be replaced. Replacement requires plumbing—call a well pro if you are not comfortable.
When should I call a well professional for a pressure tank?
Call a well pro if the tank will not hold air, the tank is leaking, you need to replace the tank, or you are not comfortable with plumbing. Tank replacement requires shutting off the pump and draining the system.

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