The most common fix: check and adjust your pressure tank settings

Most low water pressure on a well comes from a pressure tank that is set too low or has lost air charge. Your pressure tank holds compressed air that pushes water through your pipes. When the air pressure inside drops, your system cannot deliver water at full force.

The tank has two settings you can adjust yourself: the cut-in pressure (when the pump turns on) and the cut-out pressure (when it turns off). If your pressure gauge reads lower than it should, the cut-in is set too low. Most household systems run between 30 and 50 pounds per square inch (PSI), with 40 PSI being standard. Check your pressure gauge on the side of the tank or near the pump to see what you have now.

To raise the pressure, locate the air valve on top of the pressure tank—it looks like a tire valve on a car. Use an air compressor to add air until the gauge reads about 2 PSI below your desired cut-in pressure. For example, if you want the pump to turn on at 40 PSI, add air until the tank reads 38 PSI with the system at rest and the pump off. This takes 10 to 15 minutes and costs nothing if you have a compressor.

Key Takeaways

  • A pressure tank set too low is the most common cause of weak water pressure on a well, and you can adjust it yourself by adding air through the valve on top.
  • Standard household pressure is 40 PSI, and your tank air charge should be about 2 PSI below that number when the pump is off.
  • A waterlogged tank—one that has lost its air charge and filled with water—needs to be drained and recharged, or replaced if it cannot hold air.
  • If pressure is normal at the tank but weak at your faucets, the problem is in your pipes or a clogged filter, not the well itself.
  • A failing pump or a well that has run dry requires a professional inspection and may mean calling a well contractor.

How to drain and recharge a waterlogged pressure tank

If you added air but the pressure still drops quickly, or if the tank feels heavy and full of water when it should feel lighter, the tank is waterlogged. This means the rubber bladder or diaphragm inside has failed, and water has filled the space where air should be. A waterlogged tank cannot hold pressure and will not fix itself.

To drain it, turn off the pump at the breaker and open a faucet to release pressure. Locate the drain valve at the bottom of the tank (a small spigot or ball valve) and open it to let water run out into a bucket or floor drain. Once empty, close the drain valve. Turn the pump back on and let it run for a few minutes to refill the tank, then turn it off again and check the air valve pressure. If the tank refills with water instead of holding air, the bladder is torn and the tank must be replaced.

If the tank does hold air after draining, add air through the top valve as described above until you reach the correct pressure. This usually solves the problem for a year or two, but waterlogged tanks eventually fail completely. Plan to replace it within the next few years.

Checking for clogs and leaks between the tank and your faucets

If your pressure tank reads normal (around 40 PSI) but water comes out weak at the kitchen sink or shower, the problem is not the tank or pump—it is somewhere in your home's plumbing. A clogged sediment filter, a partially closed valve, or a leak in a buried line can all cause this.

Start by checking any sediment filters on your well line. These are usually clear plastic cartridges that screw into a housing near the pressure tank. If the filter looks brown or cloudy, it is clogged and restricting flow. Replace it with a new one of the same micron rating (usually printed on the side). A clogged filter is the second most common cause of low pressure after tank problems, and replacing it takes 10 minutes.

Next, look for a pressure gauge on the line between the tank and your house. If you have one, turn on a faucet and watch the gauge. If pressure drops sharply when water flows, you have a leak or blockage in the line itself. This requires a plumber to locate and repair, because the line may be buried or run through walls.

When the pump itself is failing

If the pressure tank is charged correctly, the filter is clean, and you have no visible leaks, but pressure is still low everywhere in the house, the pump may be wearing out. A failing pump will not build pressure even when running, or will cycle on and off rapidly without maintaining steady pressure.

Listen to the pump when it runs. A healthy pump hums steadily for a minute or two and then stops. A failing pump may make grinding noises, cycle every few seconds, or run continuously without building pressure. If you hear any of these signs, the pump is likely near the end of its life and should be inspected by a well contractor.

Pump replacement is not a DIY job—it requires pulling the pump from the well, which can be 50 to 400 feet deep depending on your location. A well contractor will diagnose whether the pump itself has failed or whether the problem is low water level in the well. Call a contractor if your pressure tank and filter are both in good condition but pressure remains low.

Low water level in the well itself

If your well has run dry or the water table has dropped, no amount of tank adjustment will help. This is most common in drought years or in areas where many wells draw from the same aquifer. A well that produces no water or very little water may have a pump that is set too deep, or the well may straightforward need time to recharge.

A well contractor can measure the water level inside your well using a straightforward weighted tape. If water is present but the pump is not reaching it, the pump may need to be lowered. If the well is truly dry, you may need to wait for rainfall to recharge the aquifer, drill a new well, or arrange for water delivery in the short term.

Some areas have seasonal dry spells where wells recover in winter or spring. Before spending money on a new well, ask your contractor whether your well has historically recovered and when. If your neighbors' wells are also low, the problem is regional and temporary.

Upgrading to a larger pump or tank

If your system is working correctly but you have added bathrooms, a washing machine, or outdoor irrigation since the well was installed, your original pump and tank may be undersized for your current demand. When multiple faucets run at once, pressure drops because the pump cannot keep up.

A larger pump moves more water per minute, and a larger tank stores more water so the pump does not have to run constantly. Upgrading both usually costs between $1,500 and $3,500 depending on pump size and tank capacity, and requires a well contractor to install. This is worth considering only if your pressure is low during peak use (morning showers, laundry day) but normal when only one faucet runs.

Before upgrading, have a contractor measure your current flow rate and compare it to your household demand. Many people assume they need a bigger pump when they actually just need to adjust the tank pressure or replace a clogged filter.

Frequently Asked Questions

What PSI should my well pressure tank be set to?

Standard household pressure is 40 PSI, meaning the pump turns on at 40 PSI and off at 60 PSI. Some systems run at 30/50 or 50/70 depending on the home's elevation and plumbing design. Check your pressure gauge or ask your well contractor what your system was originally set to, then adjust the air charge to match.

Can I add air to the pressure tank myself, or do I need a contractor?

You can add air yourself using a bicycle or car air compressor and the valve on top of the tank. It takes 10 minutes and costs nothing. However, if the tank is waterlogged or the air valve is broken, you will need a contractor to drain, repair, or replace the tank.

How often should I check the air pressure in my well tank?

Check it once a year, ideally in fall before winter demand increases. If pressure drops more than a few PSI in a year, the tank is losing air and the bladder may be failing. Tanks that lose air quickly should be replaced within a year or two.

Why does my water pressure drop when I run the washing machine?

The washing machine draws a large volume of water quickly, and if your tank is small or your pump is undersized, the tank cannot refill fast enough. This is normal in older homes with small tanks. You can reduce the effect by running the washer at off-peak times, or upgrade to a larger tank and pump if the problem is severe.

Is low water pressure a sign my well is running dry?

Not necessarily. Low pressure is usually caused by a tank that is set too low, a clogged filter, or a failing pump. A truly dry well produces no water at all, not weak water. Have a contractor measure your water level before assuming the well is depleted.