Well Water Pressure Tanks

Well Pressure Tank Troubleshooting: Waterlogged, Short Cycling & Low Pressure

If your well pump keeps cycling on and off every few seconds, your water pressure spikes and drops without warning, or your pressure tank feels suspiciously heavy, something is wrong. After 32 years in the water treatment industry, I can tell you that most pressure tank problems trace back to one of five common causes. This guide walks through each one: what you'll notice, how to diagnose it yourself, what you can fix, and when the tank needs to be replaced.

This article is part of our Complete Guide to Well Water Filtration Systems.

Problem 1: Waterlogged Pressure Tank

A waterlogged pressure tank is the single most common pressure tank failure I see. It means the tank is completely (or nearly completely) filled with water, with little to no air cushion remaining. The bladder inside the tank has either ruptured or is leaking, allowing water to fill the air side of the tank.

How a Healthy Pressure Tank Works

Inside every modern pressure tank is a rubber bladder. Water fills the bladder, and compressed air surrounds it. When you open a faucet, the air pressure pushes water out of the bladder and into your pipes without the pump needing to run. The pump only kicks on when the pressure drops to the cut-in point (typically 30 or 40 PSI).

When the bladder fails, water fills the entire tank. There's no air cushion to push water through the pipes. The pump has to turn on every single time you open a faucet, even for a glass of water.

Symptoms of a Waterlogged Tank

• Pump cycles on and off every few seconds when any water is used (this is the classic sign)
• Clicking sounds from the pressure switch near the tank, rapid and repeated
• Tank feels extremely heavy when you try to rock it
• Knocking on the tank produces a solid thud all the way from bottom to top (a healthy tank sounds hollow near the top)
• Water sprays from the Schrader valve (the air valve on top) when you press the core with a tire gauge

How to Check for a Waterlogged Tank

1. Turn off the pump at the breaker or disconnect switch.
2. Open a faucet to relieve pressure and drain the tank.
3. Locate the Schrader valve on the top of the tank. It looks exactly like a tire valve.
4. Press a tire pressure gauge onto the valve.
   • If air comes out and you get a PSI reading: the bladder is intact (it may just need a recharge).
   • If water sprays out: the bladder has ruptured and the tank must be replaced.
   • If you get zero pressure and no water: the bladder may have a slow leak. Try adding air with a compressor and see if it holds.

Why Bladders Fail

• Age: Rubber degrades over time. Most bladders last 10 to 15 years under normal conditions.
• Water quality: Acidic water (low pH), sediment, and chlorine all accelerate bladder deterioration. If you have a pH below 6.5, the rubber breaks down faster. This is one reason we always recommend acid neutralizers before the pressure tank when possible.
• Over-pressurization: If the air pre-charge was set too high or the pressure switch was adjusted beyond the tank's rating, the bladder stretches and wears prematurely.
• Cycling frequency: A tank that's too small for the household forces more cycles, which means more flexing of the bladder.

Can You Repair a Waterlogged Tank?

No. Once the bladder has ruptured, the tank cannot be repaired. The bladder is sealed inside the tank during manufacturing and is not a serviceable part. Replacement is the only option. The bright side: modern bladder tanks are reliable and straightforward to install. Most homeowners with basic plumbing skills can swap one in a couple of hours.

Problem 2: Short Cycling (Rapid On/Off)

Short cycling means the well pump turns on and off far more frequently than it should. A healthy system might cycle a few times per hour during normal usage. A short-cycling pump might turn on and off every 10 to 30 seconds.

Why Short Cycling Destroys Pumps

Every time a well pump starts, it draws a surge of electrical current (called inrush current) that's several times higher than its running amperage. This generates heat in the motor windings. Under normal cycling, the pump has time to cool between starts. With short cycling, the motor never cools down. The windings overheat, insulation breaks down, and the pump eventually burns out.

A submersible pump sitting 200 feet down your well costs $1,000 to $2,000+ to replace, and that's just the pump. Pulling it, replacing it, and lowering it back down can add another $1,000 to $2,000 in labor. A pressure tank that prevents short cycling costs a fraction of that total.

Causes of Short Cycling

Problem 3: Low Water Pressure

Low water pressure from a well system is frustrating, and it can come from several different places. The key is figuring out whether the problem is the tank, the pump, the pressure switch, or the plumbing itself.

Not sure what size you need? Our Pressure Tank Sizing Guide walks you through the formula.

For a full walkthrough on pressure switch diagnosis and adjustment, see our Pressure Switch Guide.

Step-by-Step Diagnosis

Step 1: Read the pressure gauge. Every well system should have a pressure gauge near the tank. With no water running, note the reading. It should be at or near the cut-out pressure (typically 50 or 60 PSI). If it's well below that, the pump or switch isn't doing its job.

Step 2: Check the pressure switch setting. The standard residential setting is 30/50 (pump on at 30, off at 50). Some systems use 40/60 for higher pressure. If someone has adjusted the switch down (intentionally or by accident), your pressure will be lower. The switch has two springs inside: a large one controls both cut-in and cut-out, and a small one controls the differential between them.

Step 3: Check the air pre-charge. Turn off the pump, drain the tank, and use a tire gauge on the Schrader valve. If the pre-charge is significantly off (more than a few PSI from where it should be), it affects how the tank delivers water.

Step 4: Rule out plumbing restrictions. Clogged sediment filters, corroded galvanized pipes, partially closed valves, or undersized piping can all restrict flow and make it feel like low pressure even when the tank and pump are working correctly. Check every valve between the tank and the fixtures.

Step 5: Test the pump output. If everything else checks out, the pump may be weakening. A well technician can measure the pump's flow rate and compare it to its rated capacity. A submersible pump that's losing performance may need to be pulled and replaced.

When Low Pressure Points to the Tank

The pressure tank itself doesn't create pressure. That's the pump's job. But the tank determines how consistently that pressure is delivered. A waterlogged or undersized tank can make pressure drop rapidly when water is used, even if the pump is working fine. If your gauge shows good static pressure but it plummets the moment you turn on a shower, the tank is either waterlogged or too small for your household's demand.

Problem 4: Tank Won't Hold Air Pre-Charge

You've checked the air pressure at the Schrader valve, it was low, you recharged it with a compressor, and a few days or weeks later it's low again. This is a slow bladder failure in progress.

Why It Happens

Unlike a catastrophic rupture (where the bladder tears and the tank floods immediately), a slow leak means the bladder has developed a small perforation. Air gradually migrates through the hole into the water side of the tank. You'll notice the symptoms of a waterlogged tank developing slowly over time: slightly more pump cycling, slightly less consistent pressure.

How to Confirm

1. Recharge the tank to the correct PSI (2 below cut-in pressure).
2. Mark the date and the PSI reading.
3. Check again in 1 week. If the pressure has dropped by more than 1 to 2 PSI, the bladder is leaking.
4. Check the Schrader valve itself. Sometimes the valve core leaks (just like a tire valve). Put some soapy water on it. If it bubbles, replace the valve core (a $2 fix from any auto parts store) before condemning the whole tank.

The Schrader Valve vs. the Bladder

Before replacing the entire tank, always rule out the Schrader valve itself. The valve core (the tiny pin mechanism inside) can fail just like one on a tire. Soapy water on the valve will reveal if air is escaping there. A new valve core costs a couple of dollars and takes 30 seconds to swap. If the valve is fine but air keeps leaking, the bladder is the problem and the tank needs to go.

Problem 5: Fluctuating Water Pressure

You're in the shower and the pressure surges strong, then drops, then surges again. Or you notice the kitchen faucet pulsing. Fluctuating pressure is one of the more confusing symptoms because it can come from several sources.

Common Causes

The Backwash Overlap Problem

This is something I see regularly with customers who have multiple water treatment systems. If your iron filter, acid neutralizer, and water softener are all set to backwash at 2:00 AM, they'll fight each other for water flow. The fix is simple: stagger the backwash times. Set one at 2:00 AM, the next at 4:00 AM, and the third at 6:00 AM. This eliminates the pressure competition entirely.

Constant Pressure Systems

If fluctuating pressure is driving you crazy and your well pump and tank are both due for replacement, consider upgrading to a constant pressure system. These use a variable-frequency drive to adjust pump speed in real time, maintaining consistent pressure regardless of demand. They use a small expansion tank (about the size of a basketball) instead of a large bladder tank. It's a bigger investment upfront, but the pressure consistency is noticeably better.

When to Replace vs. Repair Your Pressure Tank

Here's the honest answer from 32 years in the field: most pressure tank problems end with replacement, not repair. The tank itself has very few serviceable parts. But not every problem means you need a new tank today.

Repair (Don't Replace Yet)

Replace (The Tank Is Done)

Age Guidelines

I regularly tell customers with older systems to replace the pressure tank while they're installing other equipment. One customer I worked with recently had a 10+ year old system, and I recommended replacing the tank along with his other maintenance because older models are prone to waterlogging. It's easier and cheaper to swap the tank proactively than to deal with an emergency failure (and possible pump damage) later.

Choosing a Replacement Tank

If you've determined your tank needs to be replaced, here's what to consider.

Steel vs. Composite (Fiberglass)

Both types work well. The Well-X-Trol is the name most plumbers know and trust. The WellMate is the better choice if your tank sits in a damp basement or crawl space where external corrosion is a concern, or if you need to carry it through tight doorways (it's much lighter).

Our Pressure Tank Lineup

All tanks ship free to the lower 48 states. Not sure which size is right for your house? Call Aidan at 800-460-5810 and I'll help you size it based on your household, plumbing, and water treatment setup.

Frequently Asked Questions

Keep Reading: Pressure Tank Guides