The most direct fix: install or repair your pressure tank

Low well water pressure usually comes from a failed or undersized pressure tank, a waterlogged tank, or a clogged intake line. A pressure tank stores water under air pressure so your pump does not run every time you turn on a tap. When the tank fails or loses its air charge, pressure drops even though the pump works fine.

If you have a pressure tank already, the first step is to check the air pressure inside it with a tire gauge at the valve on top. The air pressure should be about 2 pounds per square inch (psi) below your system's cut-in pressure — typically 28 psi if your system cuts in at 30 psi. If the gauge reads zero or very low, the tank has lost its air charge and needs to be recharged or replaced. A plumber or well contractor can recharge it in an hour for under $200, or you can buy a new tank for $300 to $800 depending on size.

If you do not have a pressure tank at all, installing one is the single most effective way to raise pressure. A tank sized for your household — usually 20 to 80 gallons — will store enough water that your pump does not cycle constantly and your pressure stays steady between the cut-in and cut-out points (usually 30 to 50 psi).

Key Takeaways

  • A pressure tank that has lost its air charge is the most common cause of low well pressure and can be recharged or replaced for $200 to $800.
  • Installing a pressure tank if you do not have one will raise pressure more reliably than any other single fix.
  • A clogged well intake line, sediment in the well, or a failing pump can also cause low pressure and require inspection by a well contractor.
  • Adjusting the pressure switch on your pump changes when the pump turns on and off, but does not increase the pressure the pump itself can deliver.
  • A larger or higher-horsepower pump may be needed if your current pump cannot deliver enough flow at adequate pressure for your household.

Check and clear the intake line and well screen

If your pressure tank is in good condition but pressure is still low, the problem is often a clogged intake line or a well screen blocked by sediment. The intake line runs from the well down into the water and back up to your pump. Over years, mineral deposits, rust, or sediment can narrow or block it.

A well contractor can pull the intake line and inspect it. If it is clogged, they can clean it or replace it — a job that usually costs $300 to $600. If the well screen itself (the filter at the bottom of the intake line) is clogged, it may need to be cleaned or replaced, which requires pulling the entire pump assembly.

Sediment in the well itself can also reduce pressure. If your water looks cloudy or sandy, the well may need to be developed — a process where a contractor flushes the well to clear sediment from around the screen. This typically costs $200 to $400 and can restore pressure significantly.

Inspect and test your pump

A pump that is failing or undersized for your household will not deliver adequate pressure no matter what else you fix. If your pressure tank is charged, the intake line is clear, and pressure is still below 30 psi, the pump itself may be the problem.

A well contractor can test your pump's output — how many gallons per minute it delivers at a given pressure. If the pump is old (15 years or more) or has been running constantly, it may have worn impellers or internal seals and will need replacement. A new pump costs $800 to $2,000 installed, depending on depth and horsepower.

If your pump is new but your household has grown or you have added fixtures (a second bathroom, an outdoor spigot), your original pump may straightforward be too small. A contractor can recommend a larger pump or a higher horsepower model that will deliver more flow at better pressure.

Adjust the pressure switch if the tank is working

Your pump has a pressure switch that tells it when to turn on and off. The switch typically cuts in at 30 psi and cuts out at 50 psi. If you want higher pressure throughout your house, you can adjust the switch to cut in and cut out at higher pressures — for example, 40 psi cut-in and 60 psi cut-out.

This adjustment does not make the pump more powerful; it only changes when the pump runs. If your pump cannot deliver 60 psi, raising the switch will just make the pump run longer without reaching the target pressure. Adjusting the switch makes sense only if your pump is capable of delivering the pressure you want but your tank is too small or your switch is set too low.

To adjust the switch, you will need a wrench and a pressure gauge. The switch has two nuts on top — one controls cut-in pressure, the other controls cut-out pressure. Tighten the nuts slightly to raise pressure, loosen them to lower it. Make small adjustments (1 to 2 psi at a time) and test the pressure at a faucet after each change. If you are not comfortable doing this, a plumber can do it in 30 minutes for $75 to $150.

Install a booster pump if your well pump is adequate

If your well pump delivers enough water but at low pressure, a booster pump can raise pressure without replacing the main pump. A booster pump sits between your pressure tank and your house and compresses the water further.

Booster pumps cost $400 to $1,200 installed and work well if your main pump is sound but undersized for pressure. They are less common than pressure tank repairs or pump replacement because they add another piece of equipment to maintain, but they are useful when the main pump is new and you do not want to replace it.

A booster pump requires its own pressure tank and switch, so installation is more involved than a straightforward tank repair. A well contractor can determine whether a booster pump makes sense for your situation or whether replacing the main pump is more cost-effective.

Have the well itself inspected if pressure remains low

If you have repaired or replaced the tank, cleared the intake line, tested the pump, and pressure is still inadequate, the well itself may be failing. A well can lose production over decades as the aquifer level drops or the well screen becomes encrusted with mineral deposits.

A well contractor can perform a flow test to measure how much water your well actually produces. If the well produces less than your household needs, you may need to deepen the well (if the aquifer allows), drill a new well, or install a storage tank that fills slowly over time and supplies your house from storage rather than directly from the pump.

Well deepening costs $1,500 to $3,000 depending on depth and geology. Drilling a new well costs $3,000 to $8,000 or more. These are significant expenses, so a contractor should confirm the well is the problem before you commit to either option.

Frequently Asked Questions

Can I increase water pressure by tightening the pressure switch myself?

Yes, but only if your pump can actually deliver the higher pressure. Tightening the switch tells the pump to run longer, but if the pump is already at its limit, it will just cycle constantly without reaching the target pressure. A well contractor can test your pump's maximum pressure before you adjust anything.

How do I know if my pressure tank is waterlogged?

Tap the tank with a wrench — a hollow sound means it still has air, a dull thud means it is full of water. You can also check with a tire gauge on the air valve at the top. If the gauge reads zero or very low, the tank has lost its air charge and needs to be recharged or replaced.

What is the difference between a pressure tank and a booster pump?

A pressure tank stores water under air pressure so your pump does not run constantly. A booster pump compresses water that is already in your system to raise pressure further. Most homes need a pressure tank; a booster pump is added only if the main pump cannot deliver enough pressure on its own.

How much does it cost to replace a well pump?

A new pump and installation typically cost $800 to $2,000, depending on the depth of your well, the horsepower needed, and your region. A pressure tank repair or recharge costs much less — usually $200 to $400 — so always have the tank checked before replacing the pump.

Can low water pressure be caused by something other than the well?

Yes. Clogged fixtures, a failing water heater, or a problem with your house plumbing can lower pressure at specific faucets or throughout the house. If pressure is low everywhere, the problem is almost always the well system. If it is low in one area, check that fixture or the supply line to it first.