What is a tank bladder?

A tank bladder is a rubber membrane sealed inside a well system's pressure tank. It divides the tank into two chambers: one holds compressed air, and the other holds water drawn from the well. As the pump runs, water enters the tank and compresses the air on the other side of the bladder. When you open a tap, this pressurized air pushes water out without the pump cycling on immediately, reducing run frequency and wear.

The bladder itself is typically made of flexible elastomer material, often EPDM rubber, that can expand and contract thousands of times over its service life. It remains sealed by a valve, so air and water never mix. When the bladder fails or ruptures, air bleeds into the water side or escapes entirely, causing pressure loss, constant pump cycling, and reduced water pressure at your fixtures.

In Bonner County's rural and residential wells, a working bladder keeps your pressure tank efficient and your system stable. Signs of a failing bladder include the pump running too frequently, weak water pressure, or air sputtering from your taps. If you suspect bladder failure, pressure tank and system repair specialists can test the tank's air charge and replace the bladder without replacing the entire tank, which is often the more cost-effective repair.