Why Your Well Pressure Drops and What You Can Do About It
Low water pressure from a well usually comes from one of three sources: a failing pressure tank, a clogged intake line, or a pump that is losing power. You can often fix it yourself by checking the air charge in your pressure tank, clearing sediment from your pipes, or adjusting the pressure switch. If those steps do not work, the pump itself may need service or replacement—a job for a licensed well contractor.
The good news is that most pressure problems show up gradually, giving you time to diagnose before the system fails completely. Start with the simplest checks first: the pressure tank and the visible pipes. If those are sound, move to the pressure switch and pump settings.
Key Takeaways
- A pressure tank loses its air charge over time and must be re-pressurized with a bicycle pump or compressor to restore normal flow.
- Sediment buildup in your well intake or pipes can block water; flushing the system or replacing the intake screen often restores pressure.
- The pressure switch controls when the pump turns on and off; adjusting it upward (usually a small nut on top) can increase the pressure the system holds.
- If pressure drops suddenly rather than gradually, check for leaks in visible pipes and fittings before assuming the pump has failed.
- A licensed well contractor can test pump output and water depth to confirm whether the pump itself needs repair or replacement.
Check and Recharge Your Pressure Tank
The pressure tank is a metal cylinder, usually near your pump, that stores pressurized water and keeps pressure steady between pump cycles. Over months or years, the air inside the tank leaks out through the rubber bladder or diaphragm, and the tank fills with water instead. When this happens, the pump runs constantly and pressure stays low.
To check the tank, turn off the pump and open a faucet to release all pressure. Feel the top of the tank with your hand—the upper half should sound hollow and feel lighter than the lower half. If the whole tank feels heavy and full, the air charge is gone.
Recharge the tank by connecting a bicycle pump or air compressor to the air valve (a small stem on top, similar to a car tire valve). Pump air in until a pressure gauge reads 2 pounds per square inch (psi) below your system's cut-in pressure—usually around 28 to 30 psi for a system set to 40 psi. Turn the pump back on and check your faucet pressure. If pressure improves noticeably, the tank was the problem.
If pressure does not improve after recharging, the bladder inside the tank has likely ruptured and the tank needs replacement. A new pressure tank costs between $300 and $800 installed, depending on size.
Clear Sediment From Your Well Intake and Pipes
Sand, silt, and mineral buildup inside your well or in the intake line can restrict water flow and lower pressure. This happens more often in older wells or after heavy rain stirs up sediment.
Start by checking the intake screen—a fine mesh filter at the bottom of your well pipe. If you can access it (usually only if your well is shallow and you have a hand pump or can pull the pipe), rinse it under clean running water or soak it in white vinegar for an hour to dissolve mineral deposits. Reinstall it and test your pressure.
If you cannot access the intake screen, flush the system instead. Turn off the pump, open the lowest faucet in your house (usually a basement or outdoor spigot), and let water run until it runs clear. This pushes sediment out of the pipes. Turn the pump back on and check pressure at an upper-floor faucet. Repeat flushing once a week for three weeks if sediment is heavy.
If flushing does not help and your well is more than 30 years old, the intake pipe itself may be corroded or clogged. A well contractor can pull the pipe and inspect it, or recommend replacement if it is beyond cleaning.
Adjust Your Pressure Switch Settings
The pressure switch is a small device mounted on or near the pressure tank that tells the pump when to turn on and off. It has two adjustable nuts on top: one controls the cut-in pressure (when the pump starts) and one controls the cut-out pressure (when the pump stops). Raising these settings increases the pressure your system delivers.
Before adjusting, note your current pressure by attaching a pressure gauge to an outdoor faucet with the pump running. Most household systems run between 40 and 60 psi; 40 psi is standard for older homes, and 60 psi is common for newer ones with multiple bathrooms.
To raise pressure by 5 to 10 psi, use a wrench to turn the larger nut (usually marked with an arrow) clockwise one-quarter turn. Wait 30 seconds for the pump to cycle, then check pressure again. Adjust in small increments—do not jump more than 10 psi above your current setting, as this strains the pump and tank.
Do not raise pressure above 80 psi; higher pressure damages faucet seals, toilet fill valves, and appliances. If you need more than 80 psi, the pump itself is undersized and needs replacement.
Look for Leaks in Visible Pipes and Fittings
A sudden drop in pressure—not gradual over weeks—often signals a leak. Water escaping from a crack or loose fitting means less water reaches your faucets.
Inspect all visible pipes from the tank to your house, especially at joints and where pipes enter the foundation. Look for wet spots, mineral stains (white or rust-colored streaks), or dripping water. Check under sinks and in the basement for pooling water or damp soil.
Tighten any loose fittings with a wrench. If a pipe is cracked, that section must be replaced—a temporary patch with plumber's tape or epoxy putty may slow a leak but will not hold long under pressure. Call a plumber or well contractor to replace the damaged section.
If you find no visible leaks but pressure is still low, the leak may be underground in the buried line from well to house. A well contractor can use a pressure test to confirm this and locate the break.
Test Your Pump Output and Water Level
If pressure remains low after checking the tank, clearing sediment, and adjusting the switch, the pump itself may be failing or the water level in your well may have dropped.
A licensed well contractor can perform two tests: a flow test measures how many gallons per minute the pump delivers (a healthy pump should match its rated output), and a water level test
A flow test costs $100 to $200 and takes about an hour. If the pump output is low, the pump may need cleaning, repair, or replacement. If the water level has dropped, you may need a new pump with a longer intake pipe, or you may need to drill a deeper well—both expensive options that depend on local geology and well depth.
Before paying for a contractor visit, confirm that your pressure tank is charged, your pipes are clear, and your pressure switch is set correctly. Many homeowners find the problem is one of these three and save the contractor call.
When to Call a Well Contractor
Handle pressure tank recharging, sediment flushing, and pressure switch adjustment yourself if you are comfortable with basic tools. These steps are low-risk and cost almost nothing.
Call a licensed well contractor if pressure does not improve after these steps, if you find a leak you cannot tighten, if the pump runs constantly without building pressure, or if pressure drops suddenly. Also call if your well is more than 40 years old and pressure has been declining slowly—the pump may be near the end of its life and a contractor can advise whether repair or replacement makes sense.
A well contractor visit typically costs $150 to $300 for diagnosis. Repairs range from $200 (pressure switch replacement) to $1,500 or more (pump replacement). Get a written estimate before authorizing work.
Frequently Asked Questions
How often should I recharge my pressure tank?
A healthy tank loses air slowly and may need recharging every two to three years. If you are recharging more than once a year, the bladder is failing and the tank should be replaced. A new tank usually lasts 10 to 15 years before the bladder wears out.
Can low water pressure damage my pump?
No, but a pump running constantly because pressure will not build can overheat and fail faster. If your pump runs without stopping, turn it off and call a contractor. Running it dry or under extreme strain shortens its life significantly.
What is the difference between a pressure tank and a pressure switch?
The tank stores pressurized water and keeps pressure steady. The switch is an electrical device that tells the pump when to turn on and off based on pressure. Both work together—a bad tank or bad switch can cause low pressure, but they are separate parts.
Will raising my pressure switch setting increase water flow to my shower?
Yes, up to a point. Higher pressure pushes more water through your pipes and faucets. However, if your pipes are clogged with sediment or your pump is undersized, raising the switch setting will not help much. Clear sediment first, then adjust the switch.
Is it safe to adjust the pressure switch myself?
Yes, if you make small adjustments (one-quarter turn at a time) and do not exceed 80 psi. Mark your starting position with a marker so you can return to it if something goes wrong. If you are unsure, take a photo of the switch before you touch it and show it to a contractor later.