A failing pressure tank gives you warning signs before it takes your well pump with it. Here are the 7 signs to watch for — and what each one means.
Your pressure tank protects your well pump by storing pressurized water so the pump doesn't have to run every time you open a faucet. When the tank fails, the pump short cycles — turning on and off every few seconds — which overheats the motor and destroys it within weeks. A $300 tank replacement beats a $1,500 pump replacement every time.
The pump turns on and off every few seconds. This is the most serious sign — the tank has lost its air cushion and can no longer store water pressure. Every rapid start draws 3–5x normal amperage, overheating the pump motor.
Pressure surges and drops rhythmically at faucets. The tank bladder is failing and can no longer deliver a smooth release of stored pressure.
Press the valve on top of the tank (like a tire valve). Air should come out. Water means the bladder has ruptured and the tank is waterlogged — replace it immediately.
A healthy tank shows a gradual pressure rise and fall. A failing tank shows the gauge jumping rapidly from cut-in to cut-out pressure with almost no drawdown in between.
Water hammer — a pressure surge caused by the pump firing directly into the plumbing with no air cushion to absorb it. Almost always a waterlogged tank.
Condensation on a pressure tank can indicate the bladder is failing and the tank is holding more cold water than it should. Combined with other symptoms, this points to bladder failure.
Most pressure tanks last 10–15 years. An older tank showing any of the above signs is near end of life. Replacement is more cost-effective than diagnosis at this stage.
💡 Quick test: Turn off the pump and open a faucet to release system pressure to zero. Press the Schrader valve on the tank. Air = tank may be OK. Water = bladder failed, replace the tank.
Yes. When a tank loses its air charge, the pump short-cycles — turning on and off dozens of times per hour instead of a few times per day. That extra wear on the motor and start capacitor is the single most common cause of early well pump failure, and pump replacement costs far more than a new tank.
Most residential tanks (20–40 gallons) run $200–$600 for the tank itself, plus $150–$400 in labor if you hire a plumber or well contractor. Larger tanks or tight crawlspace access can push total cost higher. DIY installation is possible if you're comfortable with basic plumbing and venting the system.
Sometimes. If the tank has a Schrader valve, draining the tank and recharging the air bladder with a tire pump can restore it temporarily. But if water keeps coming out the air valve, the bladder itself has likely ruptured — that's a sign you need a new tank, not just a recharge.
Watch the pressure gauge while the pump cycles. If pressure swings wildly and the pump cycles every few seconds, suspect the tank. If pressure climbs past the switch's cut-off setting without the pump stopping, or never reaches cut-off, the switch itself may be miscalibrated or failing — check that separately before replacing the tank.
A faint hum during fill is normal. Loud banging (water hammer) when the pump starts or stops, rattling, or a hollow sloshing sound are not — they point to a lost air charge, loose mounting, or a bladder that's failing. Address noise early; it rarely resolves on its own.
An undersized tank causes low pressure, short cycling, and early pump failure. Check yours free in 2 minutes.
Use the Free Calculator →