Well pressure tank problems and replacement

The pressure tank is the gray or blue tank near where the water line enters your house. It stores a small amount of water under pressure so the pump does not have to start every time you open a tap. When it fails, the pump works far harder than it should, and that is what eventually burns pumps out.

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How the tank does its job

Inside most modern tanks is a rubber bladder or diaphragm with air on one side and water on the other. As the pump fills the tank, the air squeezes, building pressure. When you run water, that squeezed air pushes water out to the house until pressure drops to the cut-in point, typically around 30 or 40 psi, and the pump turns back on.

A healthy tank lets the pump run in longer, steadier cycles. That is easier on the motor, the pressure switch and your electric bill.

Signs the tank is failing

The classic sign is short cycling: the pump clicks on, runs a few seconds, clicks off, and repeats while a faucet is open. You may also notice pressure that surges and drops in the shower, a gauge needle that swings quickly, or water spitting from the taps.

With the power off and the water drained, a pro checks the air charge at the valve on top of the tank. If water comes out of the air valve, the bladder has torn and the tank is waterlogged. A tank that is rusting through at the seams or sweating badly is also near the end.

Repair or replace

If the bladder is intact and the tank has simply lost its air charge, a pro can recharge it to the right pressure, usually a couple of psi below the pump cut-in setting. That is a quick visit.

If the bladder is torn or the shell is rusting, replacement is the fix. A new tank, fittings and labor often land somewhere around $600 to $1,500 depending on the size of the tank and how tight the space is. Larger tanks cost more up front but mean fewer pump starts each day.

Why it matters for the pump

A waterlogged tank can make a pump start hundreds of extra times a day. Every start heats the motor and wears the switch contacts. Fixing a failing tank early is one of the cheapest ways to protect a pump that may cost several thousand dollars to replace.

If your pump has already been replaced recently and is short cycling, the tank is the first thing to check.

Getting it looked at

Call or use the form and a local well pump pro serving Cartersville and Bartow County will call you back. A photo of the tank label and the pressure gauge helps them bring the right parts.

Common questions

What size pressure tank do I need?

It depends on the pump flow rate and how much water the household uses at once. A well pro sizes it so the pump runs at least a minute or two each cycle.

Can I check the air pressure myself?

With the pump power off and the tank drained, a tire gauge on the air valve gives a reading. If water comes out of that valve, the bladder has failed.

How long do pressure tanks last?

Many last 10 to 15 years. Tanks that have been short cycling or sitting in damp crawl spaces may go sooner.

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