Signs Your Well Pressure Tank Is Bad

1. Why Is the Well Pump Short-Cycling?

Short cycling means the pump starts and stops repeatedly during ordinary water use. A pressure tank normally supplies drawdown water between pump cycles. When the tank loses its air cushion, even a small demand can trigger another start.

Short cycling can also result from an undersized tank, low air charge, incorrect pressure-switch settings, a leak, or increased demand. Amtrol lists these as common causes, so pump cycling alone should not be treated as a final diagnosis.

2. Does the Pump Start After Very Little Water Use?

Open one faucet and watch how much water flows before the pump starts. If washing your hands or filling a small container triggers the pump immediately, the tank may have very little usable drawdown left. Incorrect tank sizing can cause the same behaviour.

3. Does Water Pressure Rise and Fall Rapidly?

A failing or waterlogged tank may cause pressure to fall quickly to the switch cut-in setting and rise again as soon as the pump starts. Sustained low pressure is less specific and may come from the pump, a clogged filter, a plumbing restriction, a leak, or a low-yield well.

4. Does the Pressure Gauge Move Too Quickly?

While a faucet is open, the gauge should move through the system's normal cut-in and cut-out range. Rapid movement between those settings suggests reduced drawdown. A damaged or blocked gauge can give misleading readings, so confirm that the gauge itself works before replacing the tank.

5. Will the Tank Hold Its Correct Air Charge?

Low pre-charge does not automatically mean the internal separator has ruptured. Drain the tank, adjust it to the model's required setting, and retest. If the tank quickly loses air again, inspect the Schrader valve and internal air cell or diaphragm.

6. Is the Tank Leaking or Structurally Damaged?

Water around the base, an active shell leak, severe rust, a cracked composite body, or a damaged system connection requires prompt attention. Do not cut, drill, weld, or disassemble any tank while it is pressurized. Shut off the pump and release all water pressure first.

How Can You Test a Pressure Tank Safely?

The air-pressure test is more dependable than tapping the tank. If you are not comfortable working around electrical equipment and pressurized plumbing, contact a licensed well or pump contractor.

1.  Note the pressure switch settings. Common residential ranges include 30/50 PSI and 40/60 PSI.

2.  Turn off electrical power to the well pump at the breaker or disconnect.

3.  Open a faucet or drain valve and empty the water side until the system gauge reads 0 PSI.

4.  Use an accurate tire-pressure gauge on the tank's air valve.

5.  Compare the reading with the instructions for the exact tank model.

6.  If the separator appears intact, correct the air charge, restart the system, and observe the drawdown and cycling.

7.  If the tank cannot hold air, water exits the air valve, or the body leaks, move to repair or replacement.

For Flexcon tanks, the manufacturer commonly specifies a pre-charge 2 PSI below the pressure-switch cut-in setting. Flexcon gives 28 PSI for a 30/50 system and 38 PSI for a 40/60 system. Pentair's current WellMate FAQ specifies 4 PSI below cut-in. Always follow the tank label and current model instructions.

Is the Knock Test Reliable?

Tapping the upper and lower portions of a tank may provide a rough clue about its water level, but it cannot confirm a ruptured bladder or air cell. The sound changes with tank material, size, fill level, and construction. Use the drained pre-charge test as the main diagnostic method.

Does Water From the Air Valve Mean Failure?

Water coming from the Schrader air valve strongly indicates that the internal air-water separator has failed. On many steel diaphragm tanks, that means replacing the complete tank. On a compatible WellMate composite tank, the failed air cell may be replaceable if the tank body and connections remain sound.

Is the Problem the Tank, Pump, or Well?

What Causes a Pressure Tank to Fail?

• Loss of pre-charge through the air valve or another air-side leak

• Normal fatigue of the diaphragm, bladder, or WellMate air cell

• Incorrect pressure settings that overstretch the internal separator

• An undersized tank that creates excessive cycling

• Physical damage, freezing, excessive temperature, or pressure above the tank rating

• Corrosion of exposed steel, connections, or nearby fittings

Low-pH water can increase corrosion risk in exposed metal components, but pH alone does not predict tank life. Alkalinity, chloride, sulphate, oxygen, temperature, material type, cycling, and installation conditions also matter.

Flexcon's CAD-2 design uses a butyl diaphragm and polypropylene water chamber that keep system water from touching the internal steel wall when the assembly is intact. See Flexcon's explanation of the design. For that reason, avoid claiming that raw water directly attacks every steel tank shell from the inside.

Can a Waterlogged Pressure Tank Be Repaired?

Can You Replace the Air Cell in a WellMate Tank?

Yes. Pentair confirms that a WellMate air cell can be replaced, but the tank must be removed from the system and disassembled. Pentair's WellMate FAQ says the replacement kit includes instructions. Cleanflow's genuine kits include the air cell, O-rings, washers, and installation instructions.

Use the full model number printed on the tank label. Cleanflow identifies these kits for compatible newer gray WellMate tanks and says they are not intended for older yellow models. 

If the colour, model, connector, or production generation is uncertain, contact Cleanflow before ordering.

Shop WellMate replacement air-cell kits or call Cleanflow with the model number for compatibility help.

When Should You Buy a New Pressure Tank?

Buy a complete replacement when the tank body or connection leaks, the internal separator is not serviceable, no compatible repair kit exists, or the current tank is incorrectly sized. Age alone does not prove failure, and no universal lifespan applies to every water system.

Which Replacement Tank Should You Choose?

When Does a WellMate Composite Tank Make Sense?

A WellMate composite tank body cannot rust like a steel shell. It is lightweight and uses a replaceable air cell on compatible models. The air cell, seals, connector, and surrounding system fittings can still require service.

Browse WellMate composite pressure tanks including the compact WM-6 and larger residential models.

When Does a Flexcon Well-Rite Tank Make Sense?

Flexcon Well-Rite tanks use a durable steel shell with the CAD-2 diaphragm and polypropylene water chamber. The design provides strong air-water separation and keeps system water away from the internal steel wall while the assembly remains intact.

Browse Flexcon Well-Rite pressure tanks in sizes for residential, irrigation, agricultural, and light-commercial systems.

How Do You Size a New Pressure Tank?

Do not choose a replacement by nominal gallons alone. Confirm the pump flow rate, required minimum runtime, pressure-switch settings, tank drawdown, connection size, available space, and maximum working pressure. A larger tank generally provides more drawdown and fewer pump starts, but the correct size depends on the complete system.

Contact Cleanflow for sizing assistance.

Where Can You Buy a Replacement Tank or Air Cell?

Cleanflow Utility Supply Company supplies replacement pressure tanks, WellMate air-cell kits, and complete installation components. Browse all pressure tanks for well-water systems, compare WellMate composite tanks with Flexcon Well-Rite tanks, or pair the replacement with a 304 stainless steel pressure-tank installation kit when the connection size and pressure components match the system.

For model matching and tank sizing, call Cleanflow Utility Supply Company at 1-866-335-1078. Have the existing tank model, pump flow rate, pressure-switch range, and connection size ready.

What Are the Most Common Pressure-Tank Questions?

Can a Bad Pressure Tank Damage the Well Pump?

Yes. Repeated short cycling creates additional starts and heat, which can shorten pump and motor life. Correct the cause promptly, but test the tank, switch, sizing, and plumbing before assuming the tank alone is responsible.

Can You Add Air Instead of Replacing the Tank?

Yes, when the tank only has a low pre-charge and the internal separator still holds air. Adjust the charge with the pump off and the water side fully drained. If it loses air again, further repair or replacement is needed.

Should Air Come From the Faucets?

Air at several faucets can accompany an internal separator problem, but it can also come from a low well level, suction leak, check valve, recent service, or air-injection treatment. Treat it as a clue, not proof of tank failure.

Can a WellMate Air Cell Be Replaced Without Removing the Tank?

No. Pentair says the tank must be removed from the system and disassembled. Use the instructions supplied with the exact replacement kit, and hire a qualified contractor if you are unfamiliar with pressurized well systems.