If you run a private well in or around Washington, the pressure tank is the part of the system most homeowners never think about until the water starts acting strangely. Inside the tank, a rubber bladder or diaphragm separates the water from a cushion of air. That air pushes water into the house between pump runs. When the air cushion shrinks or disappears, the tank fills with water instead, and the pump begins to behave differently. This guide covers the signs to watch for, the checks to make first, and when to stop and call for help.
What a waterlogged tank looks like
- The pump switches on and off in short, rapid bursts even when only one faucet is running.
- Pressure at the tap rises and falls, or the flow sputters during a shower.
- The pressure gauge needle moves between the cut-in and cut-out points faster than it used to.
- Air comes out of the faucets for a short time after the pump has run. This can also point to air entering the line somewhere else, so treat it as a clue rather than proof.
Why the air cushion fails
The air charge can be lost in a few ordinary ways. The bladder can develop a tear, the air valve on the tank can leak, or a fitting near the tank can let air escape. A pressure switch set incorrectly can also make a healthy tank seem waterlogged. Because several causes look alike from the faucet, it helps to check the tank itself before replacing parts.
Checks to make first
- Watch the pump for several cycles while one faucet runs slowly. Note how long the pump runs and how long it rests.
- Find the tank and its air valve. The valve is usually on the top or upper side and looks like a tire valve.
- Before touching anything, turn off power to the pump at the breaker. Pump motors and their wiring carry live current even when the water is off.
- Open a faucet at a lower level in the house and let it run until water stops. This relieves the pressure in the tank so the air reading is accurate.
- With the water side empty, press a tire-style gauge onto the air valve and read the air pressure. Compare the reading to the pump cut-in setting printed on the tank label or the pressure switch.
Reading the results
- If the air is low and the tank otherwise looks sound, adding air may restore normal cycling for a while. Check again after a few days, because a steady loss of air means something is still leaking.
- If the air drops again quickly, or water comes out of the air valve when you press on it, the bladder has likely failed. In that case the tank usually needs replacing.
- If the air holds and the pump still short cycles, the problem may be the pressure switch, a check valve, or a leak in the line between the pump and the house.
Safety and when to call
A pressure tank holds water and air under pressure, so keep your hands and tools clear of the pressure switch and the tank fittings while you work. Do not adjust switch screws if you are unsure what they control, and do not work on wiring with wet hands or standing water nearby. If the tank is heavy, leaking, or the wiring looks damaged, bring in a licensed well contractor or electrician for the work.
A tank problem is not a water test
A waterlogged tank is a pressure issue, not a water quality result. Clear water at the tap does not show what is in the well. Private wells in Washington and the wider Franklin County river-bottom area are not routinely tested by anyone other than the owner, so the owner carries that job. Bacteria, nitrate, iron, hardness, and radium are separate questions with their own tests. Fixing the tank will not answer them, so plan a water test on its own schedule, especially after flooding or any change in taste, color, or smell.