Why is my well pump losing pressure?

The most common causes of low water pressure from a private well are a waterlogged pressure tank (the rubber bladder has failed), a failing well pump, or a drop in the water table level. Start by checking the pressure tank — it accounts for the majority of pressure problems and is the least expensive fix.

How do I know if my pressure tank is waterlogged?

Tap the side of the pressure tank from bottom to top. A healthy tank produces a hollow 'thud' on the upper portion where the air bladder is. A waterlogged tank sounds completely solid throughout. You can also check the air valve stem (like a tire valve) at the top — if water comes out instead of air, the bladder has failed.

How much does it cost to replace a well pump?

Well pump replacement typically costs $1,200–$2,500 installed, including the new pump, wiring, drop pipe, and labor. Deep submersible pump replacement (100+ feet) tends to cost more than shallow jet pump replacement due to the equipment needed to pull and reset the pump.

How do I check my well water pressure?

Check the pressure gauge on your pressure tank. Standard residential systems operate between 30–60 PSI (a 30/50 system) or 40–80 PSI (a 40/60 system). If pressure stays below 20 PSI consistently, the pump runs constantly without building pressure, or pressure drops immediately when a faucet opens, there is a problem that requires diagnosis.

Can I replace a pressure tank myself?

Replacing a pressure tank is DIY-possible for someone comfortable with plumbing. Steps: shut off power to the pump at the breaker, open a faucet to release system pressure, close the valve between the tank and the house, drain the tank, disconnect the old tank, and connect the new one pre-charged to 2 PSI below your pump's cut-in pressure. Turn power back on and check for leaks.

Private Wells

Well Pump Losing Pressure: Causes, Diagnosis, and Fixes

Step-by-step diagnosis for low or lost water pressure from a private well — covering pressure tank problems, pump failure signs, and what each fix costs.

TL;DR

Low water pressure from a private well is almost always caused by one of three things: a waterlogged pressure tank, a failing well pump, or a drop in the water level in the well itself. Start with the pressure tank — it's the cheapest and most common fix. If the tank checks out, move to the pump. A waterlogged tank can be fixed for $150–$300. A failed pump typically runs $1,200–$2,500 installed. Don't let low pressure go undiagnosed — it often signals a problem that gets worse and more expensive over time.

How Your Pressure System Works

Before you can diagnose the problem, you need to understand what's supposed to happen.

Your well pump (usually submerged deep in the well) pushes water up into a pressure tank inside your home or pump house. The pressure tank has a rubber bladder or diaphragm inside. One side holds pressurized air (pre-charged to a set PSI), and the other side fills with water. As water fills the tank, air pressure builds. When you open a faucet, that air pressure pushes water out without the pump running constantly.

The pump kicks on at a low-pressure cutoff (typically 30 or 40 PSI) and shuts off at the high-pressure cutoff (typically 50 or 60 PSI). A standard setup is called 30/50 or 40/60.

When this system works correctly, you have steady pressure and your pump cycles on and off normally. When something fails, you get weak pressure, no pressure, pressure that drops suddenly, or a pump that runs constantly without building pressure.

For a broader overview of how private well systems work, see private well 101.

Step 1: Check Your Pressure Gauge

Start with the basics before you call anyone.

Find your pressure tank — it's usually in a basement, utility room, pump house, or crawl space. There should be a pressure gauge mounted on or near the tank. Note the reading:

Below 30 PSI or zero: Low pressure at the tank level — could be waterlogged tank, pump issue, or low well level.
Normal range (40–60 PSI) but still low at fixtures: Could be a pipe issue, a failing pressure gauge, or a partially closed valve.
Pressure that drops quickly when you run water: Classic waterlogged pressure tank sign.
Pressure that never builds above 30 PSI even with pump running: Pump or well output issue.

Also check whether the pump is running. You'll hear it hum or cycle. If the pump is running constantly and pressure still won't build — that's a serious sign.

Step 2: Diagnose the Pressure Tank

A waterlogged pressure tank is the most common cause of erratic or low pressure, and it's one of the cheaper fixes.

What Is a Waterlogged Tank?

The bladder or diaphragm inside the tank fails — either it tears, separates, or loses its seal. When this happens, air and water mix directly instead of being separated by the bladder. The tank fills with water and loses its air charge. Without the air cushion, the pump has to kick on every time you open a faucet (even briefly), and pressure fluctuates wildly.

How to Check for a Waterlogged Tank

Turn off the power to the pump at the breaker.
Open a nearby faucet to bleed off pressure.
Find the Schrader valve (like a tire valve) on top of the pressure tank.
Using a tire pressure gauge, check the air pressure at the Schrader valve.

What the reading tells you:

No air, water comes out of the valve: The bladder is failed. Tank needs replacement.
Low air pressure (below the pump's cut-in PSI minus 2 PSI): Tank may just need air added — this is a quick fix with a bicycle pump or compressor.
Air pressure reads fine: The tank may not be the problem. Move to Step 3.

Recommended Pre-Charge Pressure

The air pre-charge in the tank should be 2 PSI below your pump's cut-in pressure. If your pump is set to 30/50, pre-charge to 28 PSI. For 40/60, pre-charge to 38 PSI.

If you're not sure of your pump settings, the pressure switch (a small box near the tank with a cover you can pop off) usually has the settings printed inside.

Step 3: Look for Pump Failure Signs

If the pressure tank checks out, the pump is the next suspect.

Signs Your Well Pump May Be Failing

Pump runs constantly without building pressure
Pump clicks on and off rapidly (short-cycling) — this can also be a waterlogged tank
You hear the pump humming but water pressure is weak or absent
Complete loss of water with no pressure at all
Pump trips the circuit breaker repeatedly

A pump that runs constantly is working against itself and will burn out faster. If you hear it running nonstop, turn it off at the breaker and call a well professional the same day.

What Causes Pump Failure

Age: Submersible pumps typically last 10–15 years with normal use.
Running dry: If the well water level drops below the pump intake, the pump runs without water — which causes rapid overheating and motor failure.
Sediment: Abrasive sand or sediment wears down pump components over time.
Electrical issues: Power surges, improper voltage, or faulty wiring can damage the motor.
Low well yield: If your well isn't producing enough water to keep up with demand, the pump works harder and wears out faster.

What You Can Check Yourself

Check the breaker for the well pump. A tripped breaker may just need to be reset — though figure out why it tripped.
Check the pressure switch contacts. With power off, pop the cover and look for burned or corroded contacts. This is a component that sometimes fails independently of the pump.
Check for loose electrical connections at the pressure switch or control box.

Most pump diagnosis beyond this requires pulling the pump from the well — a job that needs specialized equipment and a licensed well contractor.

Step 4: Consider Low Well Level

If your pump and tank both check out, the problem may be the well itself.

Low Static Water Level

Drought, seasonal variation, or neighboring well usage can drop the water table below your pump intake. When this happens, the pump runs but can't draw water.

Signs include:

Pressure drops dramatically after running water for a few minutes, then recovers after the pump has a chance to run
Problem is worse in late summer or during dry periods
Water has increased sediment or discoloration (you may be pumping from near the bottom of the water column)

Aging or Underperforming Well

Older wells can experience reduced yield as the surrounding aquifer changes or the well casing deteriorates. A well that worked fine for 20 years may start struggling.

A well professional can perform a yield test to measure how fast your well recovers and how much water it can reliably deliver per hour.

DIY Fixes vs. When to Call a Pro

You Can DIY:

Re-pressurizing the tank air charge (if bladder is intact)
Resetting a tripped breaker
Replacing a pressure switch (about $30–$60 in parts, straightforward for anyone comfortable with basic electrical work)
Adding a tank tee or replacing a corroded valve fitting

Call a Pro For:

Replacing the pressure tank
Any diagnosis or repair involving the pump itself
Pulling the pump from the well (requires a pump puller and proper technique)
Electrical work at the control box
Low well level or yield issues

Don't pull a submersible pump yourself unless you have specific experience. The wiring, safety connections, and the physical process of lowering the pump back down the casing correctly are not beginner work.

Cost Ranges

| Repair | Typical Cost | |---|---| | Re-pressurize tank air charge | $0 (DIY) or $75–$150 service call | | Pressure switch replacement | $30–$60 parts + labor if hired | | Pressure tank replacement (DIY-friendly) | $150–$400 in parts | | Pressure tank replacement (installed by pro) | $400–$900 | | Well pump replacement (labor + parts) | $1,200–$2,500 | | Deep well pump (large capacity or deep well) | $2,000–$4,000+ | | Pressure switch + wiring repair | $150–$400 | | Well yield test | $200–$500 |

Labor rates vary significantly by region. Rural areas often have fewer well contractors, which can mean higher prices and longer wait times — especially in peak summer months when well calls spike.

Maintenance That Prevents Pressure Problems

Most pump and pressure tank problems are predictable. A few habits keep the system healthy:

Test your tank pressure annually. With pump off and pressure bled, check the Schrader valve. Add air if needed. This takes 5 minutes once a year.
Know your pump's age. If it's over 12 years old, budget for replacement and don't be shocked when it happens.
Install a pressure gauge where you can see it. Watching pressure behavior over time lets you catch problems early.
Keep a surge protector or whole-house surge protection in place. Power surges kill pump motors.
Don't ignore short-cycling. A pump clicking on and off every few seconds is not normal and causes rapid wear.

Add a pressure tank check to your rural home annual maintenance checklist so it doesn't get skipped.

When to Call a Pro

Call a licensed well contractor immediately if:

You have no water at all and resetting the breaker doesn't restore it
The pump runs constantly and pressure never builds
The pump is tripping the breaker repeatedly
You see sediment or discoloration in your water suddenly
Pressure drops mid-use and takes a long time to recover
Your well is over 15 years old and showing any of the above signs

Well systems are not difficult to understand, but pulling and replacing a submersible pump is not a DIY project for most homeowners. The pump is typically 100–400 feet underground, connected by electrical conduit and safety cables, and requires a truck-mounted hoist to retrieve safely.

Get two or three quotes for pump replacement. Prices vary, and a legitimate contractor will give you a written estimate and explain what they found.