Pressure Tank Problems: 8 Signs Something Is Wrong and What to Do

How a Pressure Tank Works (The Short Version)

A modern pressure tank contains a rubber bladder or diaphragm that separates two chambers: one filled with compressed air (pre-charged at the factory to about 28 PSI for a 30/50 pressure switch setting) and one that fills with water from the well pump. When the pump runs and fills the water side, it compresses the air side. When you open a faucet, the compressed air pushes water out of the tank without the pump running — until pressure drops to the cut-in point and the pump starts again.

This design gives you smooth, consistent pressure and limits how often the pump has to start. A healthy pressure tank might allow the pump to run for 2–5 minutes per cycle and start only 10–20 times per day. When the bladder fails, water contacts the air chamber and the air dissolves into the water — this is called waterlogging. A waterlogged tank provides no pressure storage at all, and the pump has to run almost continuously to maintain any pressure. Learn more about how a pressure tank works.

The 8 Warning Signs of a Pressure Tank Problem

Sign 1: Pump Short-Cycling

This is the most definitive sign of a waterlogged pressure tank. If you can hear your pump turning on and off every 30–60 seconds while water is running — or even when no water is running — the tank has lost its air charge. The pump is working overtime to maintain pressure because there's no air cushion to do the job between cycles.

Short cycling is not just annoying — it's actively destroying your pump. Every motor start draws 3–5 times the normal running amperage. A pump that starts 200 times a day instead of 15 times a day is aging at roughly 13 times the normal rate. Read our full guide to well pump short cycling to understand the full scope of the damage.

Sign 2: Pressure Gauge Swings Wildly

Watch your pressure gauge while someone runs water in the house. In a healthy system, the gauge should drop slowly and smoothly from the cut-out pressure (50 or 60 PSI) down to the cut-in pressure (30 or 40 PSI) over the course of a minute or more. If the gauge swings rapidly — jumping from 50 PSI to 20 PSI in seconds — the tank has little or no water storage capacity. The pressure is coming directly from the pump with no buffer.

Sign 3: Water Spurts from Faucets

If water comes out of your faucets in spurts — a burst of water, then a pause, then another burst — there's air in the water lines. This happens when a waterlogged tank allows air pockets to enter the system, or when the pump is drawing air because the well level is low. Either way, it's a sign that something is wrong with the pressure system. Don't ignore spurting water — it's your system telling you it's struggling.

Sign 4: Pump Runs Constantly

A pump that never shuts off is a pump that's failing to build pressure. This can happen when the tank is completely waterlogged (no storage capacity at all), when the pump itself is failing and can't generate adequate pressure, or when there's a significant leak in the system. If your pump has been running for more than 10–15 minutes continuously without anyone using water, shut it off at the breaker and call a plumber. Continuous operation overheats the motor.

Sign 5: No Water Pressure at All

Complete loss of pressure can indicate a completely waterlogged tank with a failed pump, a tripped breaker, a failed pressure switch, or a broken pipe. Check the breaker first. If the breaker is fine and the pump is running but there's no pressure, the tank may be so waterlogged that it's providing zero storage and the pump can't overcome the demand. This is an emergency — call (443) 440-0632.

Sign 6: Rust or Corrosion on the Tank Exterior

Surface rust on a pressure tank is a warning sign that internal corrosion is occurring. Pressure tanks are steel vessels — when the interior coating fails (often accelerated by acidic water or high iron content), rust works from the inside out. By the time you see significant rust on the exterior, the interior may be severely compromised. A tank with visible rust should be inspected and likely replaced before it fails catastrophically. A pinhole leak in a pressurized tank is a serious safety hazard.

Sign 7: Tank Feels Completely Full and Heavy

Here's a simple test: knock on your pressure tank with your knuckles while the system is pressurized. A healthy tank should sound hollow in the upper portion (the air side) and solid in the lower portion (the water side). If the entire tank sounds solid — like knocking on a full water bottle — the tank is waterlogged. You can also check by lifting one side of the tank slightly. A properly functioning tank should feel noticeably lighter than a tank full of water.

For a more definitive test, check the Schrader valve (the tire-valve-style fitting on the tank). With the pump off and system pressure bled down to zero, press the valve pin. You should get a burst of air. If you get water, the bladder has failed and the tank is waterlogged. See our detailed guide to signs of a waterlogged pressure tank.

Sign 8: Pressure Switch Burns Out Repeatedly

Pressure switches are designed to last many years under normal cycling conditions. If you've replaced your pressure switch more than once in a few years, the switch isn't the problem — the short cycling is. Every rapid on/off cycle causes the switch contacts to arc and wear. A switch that's cycling 200 times a day instead of 15 times a day will fail in months. Replacing the switch without fixing the underlying tank problem is an endless cycle of repairs.

Why Waterlogging Destroys Pumps: The Math

Let's put some numbers to the damage. A submersible pump motor draws roughly 3–5 times its running amperage at startup (locked rotor current). For a 1 HP pump drawing 8 amps at running speed, that's 24–40 amps at startup — for a fraction of a second, but that fraction generates significant heat in the motor windings.

Under normal operation with a healthy pressure tank, a pump might start 15 times per day. That's 15 high-current startup events per day, or about 5,500 per year. A pump rated for 100,000 starts would theoretically last 18 years at this rate.

With a waterlogged tank, that same pump might start 200 times per day — 73,000 times per year. The same pump now reaches its theoretical start limit in less than 18 months. In practice, the heat buildup from continuous short cycling degrades the motor windings and capacitor much faster than the start count alone suggests.

A contact us for a free estimate pressure tank replacement prevents a contact us for a free estimate pump replacement. That math is not complicated — but only if you catch the waterlogged tank before it destroys the pump.

How to Check Your Pressure Tank Yourself

Before calling a plumber, you can do a basic pressure tank assessment in about 10 minutes:

• The tap test: Knock on the tank from bottom to top. You should hear a transition from solid (water) to hollow (air) somewhere in the middle to upper portion. All solid = waterlogged.
• The Schrader valve test: Turn off the pump at the breaker. Open a faucet and let pressure bleed down to zero. Press the Schrader valve pin. Air = tank has an air charge. Water = waterlogged.
• Pre-charge pressure check: With the pump off and system pressure at zero, use a tire pressure gauge on the Schrader valve. The reading should be 2 PSI below your cut-in pressure (28 PSI for a 30/50 switch, 38 PSI for a 40/60 switch). If it's significantly lower, the tank has lost its pre-charge — you can add air with a bicycle pump or compressor, but if the bladder is compromised, it won't hold.
• The short-cycle test: Turn the pump on and watch how long it runs before shutting off, then how quickly it turns back on when you run water. Less than 30 seconds between cycles = short cycling = waterlogged tank.

Pressure Tank Sizing: Why It Matters

An undersized pressure tank causes more frequent cycling even when it's perfectly healthy. Proper sizing is based on the pump's flow rate (GPM) and the pressure switch settings. For a typical residential well pump running at 10 GPM with a 30/50 pressure switch, the minimum recommended tank size is about 20 gallons of drawdown capacity — which typically means a 44-gallon tank (tanks are rated by total volume, not drawdown volume).

Many older homes have tanks that were undersized when installed, or that were replaced with a smaller tank to save money. If your pump cycles every 2–3 minutes even with a healthy tank, the tank may simply be too small. Upgrading to a properly sized tank reduces pump starts, extends pump life, and improves pressure consistency.

Constant pressure systems (variable speed pumps) eliminate the tank sizing problem entirely — the pump modulates its speed to maintain steady pressure regardless of demand, and the tank is only needed as a small buffer. See our guide to water pressure issues in Maryland homes for more on constant pressure systems.

Pressure Tank Replacement Cost in Maryland

In Calvert County and Anne Arundel County, pressure tank replacement typically costs:

• Standard residential tank (20–44 gallon): contact us for a free estimate installed
• Oversized tank (80+ gallon) or difficult access: contact us for a free estimate installed
• Tank recharge only (if bladder is intact, just lost pre-charge): contact us for a free estimate

For a complete breakdown of what affects the cost, see our dedicated guide to pressure tank replacement costs.

How Long Do Pressure Tanks Last?

A quality pressure tank in normal conditions lasts 10–15 years. Factors that shorten tank life in Maryland:

• High iron water: Iron deposits on the interior of the tank and accelerates corrosion of the steel shell
• Low pH (acidic water): Corrodes the tank interior and degrades the bladder material faster
• Oversized pump: High-pressure spikes from an oversized pump stress the bladder and tank shell
• Water hammer: Pressure surges from rapid valve closures stress the bladder repeatedly

If your tank is over 10 years old and you're seeing any of the 8 warning signs above, don't wait for a complete failure. A proactive replacement is far less disruptive than an emergency call with no water. Contact Deep Dive Plumbing Maryland at (443) 440-0632 to schedule a pressure tank inspection and replacement. We serve Calvert County and Anne Arundel County, Maryland.