Normal well pump pressure ranges from 40 to 60 pounds per square inch (PSI), with most homes set to a 40/60 split

Your well pump maintains pressure in a tank so water flows to your taps without the pump running constantly. The pressure switch turns the pump on when pressure drops to the lower number and off when it reaches the upper number. A 40/60 setting means the pump starts at 40 PSI and stops at 60 PSI. Some systems run 30/50 or 50/70 instead, depending on your home's layout and water demand.

The correct pressure for your system depends on where your well tank sits relative to your fixtures. If the tank is in a basement and your upstairs bathroom is 20 feet higher, you need enough pressure to push water up against gravity. A general rule: add 0.5 PSI for every foot of elevation difference between the tank and your highest fixture. If your highest tap is 30 feet above the tank, you would add roughly 15 PSI to your base pressure.

Check your pump's documentation or the pressure tank label to see what range the manufacturer recommends. Pushing pressure too high wears out seals and fixtures faster. Setting it too low means weak flow, especially at upper-level taps or when multiple fixtures run at once.

Key Takeaways

  • Most well pumps are set to 40/60 PSI, meaning the pump turns on at 40 PSI and shuts off at 60 PSI.
  • The correct pressure depends on elevation: add roughly 0.5 PSI for every foot your highest fixture sits above the pressure tank.
  • You can check your current pressure with an inexpensive PSI gauge screwed onto a hose bib, and adjust it using the pressure switch or air valve on the tank.
  • Pressure that is too high damages seals and fixtures; pressure that is too low causes weak flow and makes the pump cycle too often.

How to check your current pressure

You need a tire pressure gauge or a dedicated water pressure gauge (both cost under $15). Locate a hose bib or outdoor faucet closest to your pressure tank. Turn off all water use in the house, then screw the gauge onto the hose bib. The reading you see is your current system pressure.

Write down the number. If it is consistently below 40 PSI, your pump may not be building pressure properly, or the tank's air charge may be low. If it is above 60 PSI and climbing, the pressure switch may not be shutting the pump off, or the tank air charge is too high. Either way, the system is working harder than it should.

Adjusting pressure on the pressure switch

The pressure switch is a small box bolted to the top or side of your pressure tank, with two wires running to it. Inside are two adjustment nuts that control when the pump starts and stops. Before you touch anything, turn off power to the pump at the breaker.

The larger nut controls the cut-off pressure (when the pump stops). The smaller nut controls the differential—the gap between start and stop. If your system is set to 40/60 and you want to raise it to 50/70, you would turn the larger nut clockwise a quarter turn at a time, check the pressure with your gauge, and repeat until you reach 70 PSI. Then adjust the smaller nut to set the differential to 20 PSI (so the pump starts at 50).

Make small adjustments and test after each one. Turning the nuts too far can cause the pump to cycle rapidly or not start at all. If you are unsure about the switch design on your tank, take a photo and look up your tank model online, or call a well service technician—this is a straightforward job they can do in under an hour.

Adjusting the air charge in the pressure tank

Pressure tanks contain both water and compressed air. Over time, the air charge leaks out or gets absorbed into the water, and the tank loses its cushion. When this happens, the pump cycles on and off more often, even if the pressure switch is set correctly.

You can check and refill the air charge yourself using a bicycle or car air pump. First, turn off the pump and drain the tank by opening the lowest drain valve until water stops flowing. Then locate the air valve on top of the tank (it looks like a tire valve). Use a tire pressure gauge to check the air pressure. It should be about 2 PSI below your pump's cut-in pressure—so for a 40/60 system, aim for roughly 38 PSI of air pressure.

If the air pressure is low, use a bicycle pump or compressor to add air until you reach the target. Do not overfill; too much air reduces the water storage capacity. Once the air charge is correct, close the drain valve, turn the pump back on, and check your water pressure again with the gauge on the hose bib.

Signs your pressure is out of adjustment

Weak flow at taps, especially upstairs or when multiple fixtures run together, usually means pressure is too low or the tank air charge is depleted. You may also hear the pump running more often than normal—a sign it is cycling rapidly because pressure is not building properly.

Pressure that is too high causes a different set of problems: water hammering (loud banging in pipes when you turn off a tap), leaking faucet seals, and premature wear on the pressure tank itself. You may also notice the pump running for only a few seconds before shutting off, then starting again shortly after. This rapid cycling wears out the pump motor faster.

If you adjust the pressure switch and the problem persists, the issue is likely a failing pressure tank or a leak in the system. A well service technician can pressure-test the tank and check for leaks in the plumbing.

When to call a professional

If your pressure gauge shows a reading that does not match your switch settings, or if pressure drops suddenly over a few days, there may be a leak in the tank or plumbing. A professional can locate and repair it.

If the pump will not start even after you have adjusted the pressure switch, or if it runs continuously without building pressure, the switch itself may be faulty or the pump may have an internal problem. These require professional diagnosis and repair.

If you are uncomfortable working with the pressure switch or air valve, or if your tank is very old, it is safer and faster to have a technician handle the adjustment. The cost is usually $100 to $200 for a service call, and they can spot other issues at the same time.

Frequently Asked Questions

Why does my pressure keep dropping even though the pump is running?

A slow leak in the tank, plumbing, or a check valve allows pressure to escape. Turn off the pump, note the pressure on your gauge, wait 30 minutes, and check again. If it has dropped, you have a leak. A professional can pressurize the system with air to locate where water is escaping.

Can I set my pressure higher than 60 PSI to get stronger flow?

You can, but it is not the right fix. High pressure wears out seals, fixtures, and the tank faster. If flow is weak, the real problem is usually a low air charge in the tank, a clogged filter, or a failing pump. Address the root cause instead of raising pressure.

What does it mean if my pressure gauge reads zero?

The gauge may be faulty, or there is no pressure in the system. Try a different gauge. If it also reads zero, the pump is not running or not building pressure. Check that the breaker is on and the pump is receiving power. If power is good and the pump is silent, call a technician.

Is 40/60 the right setting for every house?

No. If your highest fixture is significantly above the tank, you may need 50/70 or higher. If your tank is in an attic or upper floor, you may be able to use 30/50. Check your pump documentation and account for elevation. When in doubt, a well service technician can recommend the best setting for your layout.