Pressure Tank Maintenance

What does a pressure tank do?

A pressure tank stores water under pressure so that small uses of water do not make the pump start every time. Inside most tanks there is a flexible barrier between the water and a cushion of compressed air. As the tank fills, the air is squeezed, and that squeezed air pushes water out to your taps when you open them.

The pump turns on when pressure falls to a set point and turns off when it reaches a higher set point. The space between those two points is what gives you a reserve of water between pump starts.

Why does it matter for the pump?

Every time a pump starts, its motor takes a heavy surge of electricity and heat builds up. A healthy tank keeps the number of starts low. A tank that has lost its air charge or whose barrier has failed can make the pump cycle quickly, which wears out the motor and the pressure switch far sooner than normal.

That is why the pressure tank is part of pump care. A cheap fix on the tank can protect an expensive pump.

If you hear a click, a thump or a hum from the pump room that sounds new, note when it happens. A short written log of the date, the sound and the pressure reading gives a technician something concrete to work with, and it often shortens the visit.

What are the warning signs of a tank problem?

Look for a pump that clicks on and off in short bursts, water pressure that surges or sputters, a tank that feels heavy and waterlogged, or visible rust and leaks on the shell and fittings. Pressure that swings sharply when only one tap is running is also worth noticing.

A pressure gauge near the tank shows the working range. Write down what normal looks like on your system so you can tell when it changes. Do not adjust switch settings or fittings unless you are trained, since the equipment is under stored pressure and connected to electricity.

• Short, rapid pump cycles
• Pressure that jumps or sputters
• Rust or leaks around the tank
• Gauge readings that look different from usual

What can I safely do myself?

Observation is safe. Look at the tank, listen to the pump, watch the gauge, check for puddles and note any changes. Keep the area around the tank clear and dry, and keep children and animals away from it.

Anything beyond looking should be done by a licensed pump or plumbing professional. Do not drill, cut, weld or open a pressure tank, and do not try to release air or water from it unless a professional has shown you how. Tanks hold stored energy, and injuries from tank failures are real.

Turn off power at the breaker only if you know which breaker serves the pump and you can do so safely. If you are not sure, call a professional.

What does a professional check?

A technician can measure the air charge and the pressure settings, inspect the shell and connections and test whether the pump and switch are behaving. They can tell you whether the tank can be recharged, needs replacement or points to a different problem such as a leak elsewhere.

Ask for the findings in writing. Note the size and model so you can compare options later. A larger tank gives longer pump rest periods in some systems, but the right size depends on the pump and your water use, so ask the contractor to explain the choice.

If you are buying a house with an unknown tank, ask the seller for its age and any receipts, and add a tank check to your inspection list. Tanks past their useful life often give little warning.

How long do tanks last, and how can I extend that?

Tank life varies with quality, water conditions and how the system is used. Corrosive or mineral heavy water, poor drainage under the tank and constant cycling all shorten it. Keeping the tank dry, keeping the pump from short cycling and fixing leaks quickly help.

Keep a record of when the tank was installed and serviced. Replacement does not have to be an emergency when you know the age and condition ahead of time.

What should I do in an emergency?

If a tank is leaking heavily, bulging or making unusual noises, turn off power to the pump if you can do so safely, shut off water at the main if it is reachable and call a licensed professional right away. Keep people away from the tank.

Keep emergency numbers and a backup supply of drinking water. After repair, ask whether the water needs testing.

Last reviewed: November 12, 2026. Written by the Rural Farm Life Editorial Team. See our editorial policy.