Check your pressure tank and pressure switch first

Low water pressure from a well pump usually comes from one of three places: the pressure tank has lost its air charge, the pressure switch is set too low, or the pump itself is failing. Start by checking the pressure tank — a metal cylinder usually near your pump or in the basement. This tank stores pressurized water and air. Over time, the air inside leaks out, and the tank fills with water instead. When that happens, the pump runs constantly but pressure stays weak.

You can test the tank by turning off power to the pump, then unscrewing the small air valve on top of the tank (it looks like a tire valve). If water comes out instead of air, the tank has lost its charge. You can refill it yourself with an air compressor, or call a well technician to do it. The correct air pressure is usually 2 pounds per square inch (psi) below your pump's cut-in pressure — so if your pump turns on at 30 psi, the tank should have 28 psi of air.

Next, look at your pressure switch. This device tells the pump when to turn on and off. It has two settings: the cut-in pressure (when the pump starts) and the cut-out pressure (when it stops). If the cut-in is set to 20 psi, your water will never rise above that. Adjusting the switch upward increases pressure throughout your house. The switch is usually a small box mounted on the pipe near the tank, with two nuts on top. Turning the larger nut clockwise raises pressure; counterclockwise lowers it. Most household systems run between 30 and 50 psi. Raise it in small steps — a quarter turn at a time — and check your pressure gauge between adjustments.

Key Takeaways

  • A pressure tank that has lost its air charge is the most common cause of low well water pressure and can often be recharged with an air compressor.
  • The pressure switch controls when your pump turns on and off; raising the cut-in pressure setting will increase water pressure throughout your house.
  • You can adjust the pressure switch yourself by turning the adjustment nut, but make small quarter-turn changes and test between each one.
  • If pressure is still low after the tank and switch are correct, the pump itself may be failing and will need professional inspection or replacement.
  • Most household well systems run between 30 and 50 psi; going above 60 psi can damage fixtures and appliances.

How to read your pressure gauge and know what to adjust

Before you adjust anything, you need to know your current pressure. A pressure gauge is usually mounted on the pipe near the pressure tank or on the tank itself. It has a dial face with numbers in psi. Write down the reading when the pump is running (the highest number it reaches) and when the pump shuts off (the lowest number). The difference between these two is your pressure range.

If your pump runs constantly and pressure never reaches the cut-out point, the tank is likely waterlogged. If pressure climbs normally but stays below what you need (say, 25 psi when you want 40), the switch setting is too low. If pressure jumps to your target but then drops slowly even when you are not using water, you have a leak somewhere in the system — check under the house and around the tank for dripping pipes.

Write down your readings before and after any adjustment. This tells you whether your change actually worked and by how much. Most gauges are accurate enough for household use, but if yours is very old or the needle sticks, replace it before making adjustments — you cannot trust what you cannot read.

Adjusting the pressure switch safely

The pressure switch has two nuts: a larger one that adjusts the cut-in pressure (when the pump starts) and a smaller one that adjusts the range (the gap between cut-in and cut-out). Most people only need to turn the larger nut. Always turn off power to the pump before you open the switch cover.

Turn the larger nut clockwise in quarter-turn increments. After each quarter turn, switch the power back on and let the system run until the pump shuts off. Check the gauge. If you have not reached your target pressure, turn off power again and make another quarter turn. This slow approach prevents you from overshooting — once you go too high, you have to bleed pressure out of the tank, which is messier.

Do not raise pressure above 60 psi. Water heaters, washing machines, and dishwashers are designed for pressures up to 80 psi, but sustained high pressure wears them out faster and can damage seals. If you need more than 60 psi for a specific reason — like filling a pool or running a pressure washer — use a separate booster pump instead of raising your whole system pressure.

Recharging a waterlogged pressure tank

If your tank has lost its air charge, you can refill it without calling a technician. You will need an air compressor (most hardware stores rent them for a few dollars an hour) and a tire pressure gauge. Turn off power to the pump and drain the tank by opening the lowest faucet in your house until water stops flowing.

Unscrew the air valve on top of the tank. It looks like a car tire valve. Use your tire pressure gauge to check the current pressure inside — it should read close to zero if the tank is waterlogged. Attach the air compressor hose to the valve and pump air in until the gauge reads 2 psi below your pump's cut-in pressure. If your pump is set to cut in at 30 psi, pump the tank to 28 psi.

Disconnect the compressor, close the air valve, and turn the pump back on. Let it run until it reaches cut-out pressure, then check your water pressure at a faucet. If pressure is now normal, you are done. If it is still low, the pump itself may be worn and will need professional service.

When the pump itself is the problem

If you have recharged the tank, adjusted the pressure switch, and checked for leaks but pressure is still weak, the pump is likely failing. Well pumps wear out over time — typical lifespan is 8 to 15 years depending on use and water quality. A failing pump may still run, but it cannot build pressure the way it should.

Signs of a failing pump include the motor running constantly without reaching cut-out pressure, pressure that climbs very slowly, or pressure that drops suddenly even when no water is being used. You may also hear grinding or squealing from the pump itself. At this point, you need a well technician to inspect the pump and determine whether it can be repaired or needs replacement.

Pump replacement is not a do-it-yourself job — it involves pulling the pump from the well, which requires special equipment and knowledge of your well's depth and construction. Call a licensed well contractor in your area. They can test the pump, check the well itself for problems, and install a new pump if needed. This typically costs between $1,500 and $3,000 depending on well depth and pump size, but a new pump will restore full pressure for another decade or more.

Checking for leaks that steal pressure

A slow pressure drop after the pump shuts off means water is leaking somewhere in your system. Start by looking for obvious drips under the house, around the pressure tank, and where pipes enter the foundation. Even a small leak can waste hundreds of gallons a month and prevent pressure from building.

If you cannot see a leak, turn off all water use in the house and watch the pressure gauge. If it drops more than a few psi over an hour, you have a leak. Check the toilet tanks — a leaking fill valve is the most common culprit. Flush each toilet and listen for water running into the bowl after the tank refills. If you hear it, the fill valve needs replacement.

For leaks in buried pipes or inside walls, you may need a plumber with leak detection equipment. But most household leaks are in toilets, faucets, or the water heater. Fix those first before assuming the pressure system itself is the problem.

Frequently Asked Questions

Can I adjust the pressure switch myself or do I need a technician?

You can adjust it yourself if you are comfortable working with basic tools and turning off power to the pump. The adjustment nut is usually accessible without special equipment. Make small changes and test between each one. If you are not confident, a well technician can do it in 30 minutes for a service call fee.

What pressure should my well pump be set to?

Most household systems run between 30 and 50 psi. The exact setting depends on your house layout and how many fixtures you use at once. Start at 40 psi if you are unsure. Higher pressure helps if you have a long pipe run from the well to your house or multiple bathrooms in use at the same time, but do not exceed 60 psi.

How often does a pressure tank need to be recharged?

A well-maintained tank should hold its air charge for several years. If you are recharging it more than once a year, the tank itself may be failing and need replacement. A technician can test whether the tank's internal bladder is still good or if a new tank is needed.

Will increasing water pressure damage my appliances?

Pressure above 80 psi can damage water heaters, washing machines, and dishwashers over time. Most household appliances are rated for up to 80 psi, but 60 psi or less is safer for long equipment life. If you need higher pressure for a specific task, use a separate booster pump rather than raising your whole system.

What if pressure is high but water flow is still weak?

High pressure with low flow usually means a clogged filter or screen. Check the sediment filter on your pressure tank or any whole-house filter you have. A clogged filter restricts flow even when pressure is normal. Replace or clean the filter according to the manufacturer's instructions.