Why Your Well Pressure Drops and What You Can Do

Low water pressure from a well usually comes from one of three places: a problem with the pressure tank, a clogged intake line, or a pump that is wearing out. The good news is that most of these are fixable without replacing the whole system. Before you call a well contractor, you can check several things yourself — starting with the pressure tank, which is often the culprit and the cheapest to fix.

A well system relies on air pressure inside the tank to push water through your pipes. When that air pressure drops below the pump's cut-in point (usually around 30 pounds per square inch), the pump turns on to refill the tank. If the tank loses its air charge, the pump runs constantly and water pressure stays weak. This is the most common reason for sudden pressure loss, and you can test it yourself with a tire pressure gauge.

Key Takeaways

  • Check your pressure tank's air charge first by unscrewing the valve on top and using a tire pressure gauge — it should read 2 pounds per square inch below your pump's cut-in pressure, usually around 28 psi.
  • If the tank air pressure is low, drain the tank completely, refill it with a bicycle pump or air compressor, and monitor whether pressure holds or drops again over a few days.
  • Sediment and mineral buildup in the intake line or pump screen can reduce flow; turning off the pump and opening the lowest faucet in your house for several minutes may clear small blockages.
  • If pressure was normal for years and suddenly drops, the pump impeller may be worn and need replacement, which requires a well contractor.
  • Low pressure that develops slowly over months usually means the well water level is dropping or the pump is aging, both situations where a contractor should measure your static water level.

Test and Recharge Your Pressure Tank

Your pressure tank has a rubber bladder or diaphragm inside that separates air from water. The air side can lose pressure over time through the small valve on top of the tank — the same type of valve on a car tire. To check the air pressure, turn off your pump at the breaker, then use a tire pressure gauge on that valve. The reading should be about 2 psi below your pump's cut-in pressure. If your pump turns on at 30 psi, the tank air should be around 28 psi.

If the air pressure is low or zero, the tank has lost its charge. Drain the tank completely by turning off the pump, opening the lowest faucet in your house, and letting water run until nothing comes out. Once empty, use a bicycle pump or air compressor to refill the air side to the correct pressure. Close the faucet, turn the pump back on, and check your water pressure at a sink. If pressure improves right away, you have solved the problem. If pressure drops again within a few days, the tank bladder is leaking and will need replacement — a job for a well contractor, but cheaper than a new pump.

Clear Sediment From the Intake Line and Pump Screen

Sand, silt, and mineral deposits can build up in the pipe that runs from your well to the pump, or in the pump's intake screen. This blockage reduces the volume of water the pump can pull, which feels like low pressure even if the pump itself is working. You can try a straightforward flush before calling for service.

Turn off the pump at the breaker. Locate the lowest faucet in your house — usually in a basement or on an outside wall — and open it fully. Leave it open for 5 to 10 minutes. This allows air to enter the line and can dislodge loose sediment. Then turn the pump back on and check pressure at a sink. If sediment is the problem, pressure may improve noticeably. If nothing changes, the blockage is deeper in the line or pump, and a contractor will need to pull the pump to clean or replace the intake screen.

Check for Leaks in Your Pressure Tank or Pipes

A slow leak in the pressure tank or in the buried or exposed pipes between the well and your house will cause the pump to run more often and pressure to stay low. You may not see water pooling if the leak is small or underground. To check, turn off all water use in the house and watch your pressure gauge for 15 minutes. If the needle drops while nothing is running, you have a leak.

Leaks in visible pipes are easier to spot — look for wet spots, mineral stains, or dripping around connections. Leaks in buried lines are harder to find and usually require a contractor with leak detection equipment. If you find a leak in an above-ground pipe, you can try tightening the connection with a wrench, but a persistent leak usually means the pipe or fitting needs replacement.

Know When the Pump Itself Is Failing

If your pressure tank air charge is good, the intake line is clear, and you have no leaks, the pump impeller — the spinning part that moves water — may be worn. Pump wear happens gradually over years of use. You will notice pressure dropping slowly over weeks or months, and the pump may run longer or more often than it used to.

A worn pump cannot be fixed by adjusting pressure settings or adding air to the tank. It needs replacement. Before you buy a new pump, have a well contractor measure your static water level — the depth of water in the well when the pump is off. If the water level has dropped significantly since the well was drilled, the well itself may be running dry during heavy use, and a larger pump or a deeper well may be necessary. This measurement takes an hour and costs far less than replacing a pump that will not solve the real problem.

Adjust Pump Pressure Settings (If You Have Access)

Some well pumps have adjustment screws on top that let you raise the cut-in and cut-out pressures — the points where the pump turns on and off. Raising these settings increases the pressure throughout your house. However, this adjustment should only be made if you understand your system and know the pump's rated maximum pressure, which is usually printed on a label on the tank or pump.

If you decide to adjust, turn off the pump, locate the adjustment screws (usually under a plastic cap), and turn them clockwise in small increments — a quarter turn at a time. Turn the pump back on and check pressure at a sink. Make one small change and wait a few minutes before adjusting again. Do not raise pressure above the pump's rated maximum, as this can damage the pump and pipes. If you are unsure about your system's limits, leave the adjustment to a contractor.

When to Call a Well Contractor

Call a contractor if pressure stays low after you have checked the tank air charge and flushed the intake line, or if pressure drops again within days of recharging the tank. Also call if you suspect a leak you cannot locate, if the pump is running constantly, or if pressure has been dropping slowly for months. A contractor can measure your static water level, test the pump's output, and tell you whether the problem is a worn pump, a failing tank, a clogged line, or a dropping water table.

Bring a list of when the problem started, what pressure you used to have, and any changes you noticed — like the pump running longer or more often. If you have records of when the well was drilled and how deep it is, bring those too. This information helps the contractor diagnose the problem faster and recommend the right fix.

Frequently Asked Questions

How do I know what pressure my well pump should have?

Look for a label on the pressure tank or pump that shows the cut-in and cut-out pressures — usually something like 30/50 psi, meaning the pump turns on at 30 psi and off at 50 psi. Your household pressure should be close to the cut-out number. If you cannot find a label, a well contractor can tell you the correct settings for your system.

Can low water pressure mean my well is running dry?

It can, but usually only if the pressure has been dropping slowly over months or years. A sudden pressure drop is more likely a tank, pump, or line problem. A contractor can measure your static water level to tell whether the well itself is the issue. If it is, you may need to drill deeper or install a larger storage tank.

Is it safe to adjust the pressure tank myself?

Checking and recharging the air side of the tank is safe if you follow the steps carefully — it is the same process as filling a car tire. Adjusting pump cut-in and cut-out pressures is riskier because you can damage the pump or pipes if you go too high. If you are not confident, have a contractor do it.

Why does my well pressure drop only when I use a lot of water?

This usually means the pressure tank is too small for your household's peak demand, or the tank air charge is low. When you use water quickly — running a shower and washing machine at the same time, for example — the pump cannot refill the tank fast enough. Recharging the tank air often fixes this. If it does not, you may need a larger tank.

How often should I check my well pressure?

Check it once a year as part of routine maintenance, and right away if you notice pressure dropping. A yearly check takes five minutes and can catch a failing tank before it causes bigger problems. Keep a record of the readings so you can spot trends over time.