Check Your Pressure Tank First
Low well water pressure usually starts with the pressure tank, not the well itself. Your pressure tank holds water under air pressure and releases it when you turn on a tap. If the air charge inside drops too low, the tank cannot push water through your pipes at normal pressure.
Find your pressure tank—it is a metal cylinder, usually in your basement, crawl space, or utility room near the well pump. Look for a small air valve on top, similar to a tire valve. Use a tire pressure gauge to check the air pressure inside. Most household systems run between 40 and 60 pounds per square inch (psi), with the air pressure typically set 2 psi below your system's cut-in pressure. If the gauge reads zero or very low, the tank's air bladder has likely failed and needs replacement.
If the gauge shows some pressure but it is much lower than your system's setting, you can try recharging the tank. Turn off the pump at the breaker, drain the tank completely using the drain valve at the bottom, then use an air compressor to add air back to the correct pressure. Refill the tank and restart the pump. This works only if the bladder is still intact; if pressure drops again within days, the bladder has failed.
Key Takeaways
- A failed pressure tank air bladder is the most common cause of low well water pressure and can be recharged or replaced without calling a well service.
- Check your tank's air pressure with a tire gauge against your system's cut-in pressure, which is usually printed on the pump switch or tank label.
- A clogged sediment filter or water softener can restrict flow even when pressure is technically normal, so inspect and replace filters if pressure dropped suddenly.
- If pressure is low at only one faucet or fixture, the problem is in that line, not the well or tank—check for a closed valve or debris in the aerator.
- Well pump problems require a licensed well contractor; do not attempt to repair or replace a submersible pump yourself.
Look for Clogs in Filters and Softeners
A clogged sediment filter or water softener can choke off flow even when your pressure tank is working correctly. These devices sit between the tank and your house lines and can accumulate sand, silt, or mineral buildup over time.
Locate your filter or softener—it is usually a tall cylindrical tank near the pressure tank or in a utility room. Check the pressure gauge on the inlet side (where water enters). If it reads higher than normal, the filter is clogged. For a sediment filter, turn off the pump, close the inlet and outlet valves, and unscrew the filter bowl at the bottom. Rinse the cartridge under running water or replace it if it is visibly dirty or has not been changed in over a year. For a water softener, check the salt level in the brine tank and refill if low; a depleted softener cannot regenerate and will clog.
If you have recently had work done on your well or lines, sediment may have entered the system. Flush the lines by opening outdoor faucets and letting water run for several minutes. If sediment keeps returning, you may need a whole-house sediment filter installed upstream of your other equipment.
Inspect Valves and Shut-Offs Along Your Lines
A partially closed valve can reduce pressure throughout your house or in a single room. Check every shut-off valve between your pressure tank and the affected faucets or fixtures.
Look for the main shut-off valve near the pressure tank—it should be fully open (handle aligned with the pipe). Trace the line to your house and check any isolation valves under sinks, behind toilets, or in walls. A valve that is only halfway open will feel stiff when you try to turn it and will restrict flow. Turn it fully open by rotating the handle until it stops and aligns with the pipe direction.
If a valve is stuck or will not turn, do not force it—you may break it and create a leak. Instead, turn off the pump, drain the system, and call a plumber to replace the stuck valve. Stuck valves are usually old brass or gate valves that have corroded inside.
Clean Faucet Aerators and Showerheads
If pressure is low at only one or two faucets but normal everywhere else, the problem is in that fixture, not your well system. Mineral deposits and debris collect in the aerator—the small screen at the faucet tip.
Unscrew the aerator by hand or with pliers wrapped in a cloth to avoid scratching. Rinse it under hot water and use an old toothbrush to scrub away mineral buildup. If it is heavily clogged, soak it in white vinegar for 30 minutes, then scrub again. Screw it back on and test the flow. For showerheads, unscrew the head, soak it in vinegar, and use a toothpick to clear any holes that are blocked. This straightforward step restores pressure at that fixture without touching your well system.
Understand Your Pump's Pressure Switch Settings
Your well pump turns on and off based on pressure settings in a switch mounted on or near the pressure tank. If these settings are too high, the pump will not run often enough to maintain pressure. If they are too low, the pump will cycle constantly and wear out faster.
Look for a pressure switch—a small box with two adjustment nuts on top, usually labeled "cut-in" and "cut-out." The cut-in pressure is when the pump starts; the cut-out is when it stops. Most residential systems are set to cut in around 40 psi and cut out around 60 psi. If your pressure is consistently below the cut-in setting, the pump is not running enough.
Adjusting the pressure switch requires turning the nuts clockwise to raise pressure or counterclockwise to lower it. Make small adjustments—one-quarter turn at a time—and allow the system to cycle a few times before checking results. If you are not comfortable with this, a well contractor can adjust it in minutes. Do not raise the cut-out pressure above 80 psi; higher pressures stress pipes and fixtures and shorten their life.
Know When to Call a Well Contractor
If you have checked the pressure tank, filters, valves, and aerators and pressure is still low, the problem is likely in the well pump itself. A submersible pump that is failing, a check valve that is stuck, or a broken line below ground all require professional diagnosis and repair.
Call a licensed well contractor if pressure is low throughout the house and does not improve after recharging the tank, if the pump runs constantly but delivers little water, or if you hear unusual noises from the pump. A contractor will use a pressure gauge and flow test to pinpoint the problem. Pump replacement typically costs between $1,500 and $3,000 depending on depth and pump size, but a failing pump that is left running will eventually burn out and cost more to replace.
Do not attempt to repair or replace a submersible pump yourself. These pumps are submerged in the well, require proper electrical disconnection, and can be damaged by improper handling. A contractor has the tools and experience to pull the pump safely and install a replacement without contaminating your well.
Frequently Asked Questions
Why did my water pressure drop suddenly?
Sudden pressure loss usually means the pressure tank air bladder has failed, a filter has clogged, or a valve has partially closed. Check the tank's air pressure first with a tire gauge. If it reads zero, the bladder needs replacement. If the tank pressure is normal, inspect your sediment filter and main shut-off valve next.
Can I increase pressure by adjusting the pressure switch myself?
Yes, but make small adjustments—one-quarter turn at a time—and test between each change. Do not raise the cut-out pressure above 80 psi. If you are unsure which nuts to turn or how much to adjust, a well contractor can do it safely in one service call.
What is normal water pressure for a well?
Most well systems maintain between 40 and 60 psi. You can check your pressure with a tire gauge attached to the test port on your pressure tank. Pressure below 40 psi will feel weak at faucets; above 80 psi can damage pipes and fixtures over time.
How often should I replace my sediment filter?
Replace it every 6 to 12 months, or sooner if the inlet pressure gauge reads high or water flow drops noticeably. If you have sandy soil or recent well work, you may need to replace it more often. Check the filter cartridge visually—if it looks dark or clogged, replace it regardless of how long it has been installed.
Is low pressure in one bathroom a well problem?
No. If pressure is normal everywhere else in the house, the problem is in that bathroom's line or fixture. Check the shut-off valve under the sink or behind the toilet to make sure it is fully open, and clean the faucet aerator or showerhead. If pressure is still low after that, a plumber can check for a clogged line inside the wall.