What causes low well water pressure and how to fix it

Low pressure from a well usually comes from one of three places: a clogged intake screen at the bottom of the well, sediment buildup in your pressure tank, or a pump that is undersized for your home's demand. The fastest fix is often the simplest — check your pressure tank first, because a waterlogged tank (one that has lost its air charge) will feel like low pressure even when the pump is working correctly. If the tank is the problem, you can restore pressure by draining it and letting the air valve recharge it. If the tank is fine, the issue is either the pump itself or something blocking water from reaching it.

Before you call a well contractor, you can test your pressure and narrow down the cause yourself. A pressure gauge costs under $15 and screws onto any outdoor faucet. Write down the number — if it reads below 40 pounds per square inch (psi), you have a real pressure problem. If it reads between 40 and 60 psi, your system is working as designed, and what feels like low pressure may be a fixture problem instead (a clogged aerator or a valve that is partially closed). Knowing this before you call saves you money on a service visit.

Key Takeaways

  • A waterlogged pressure tank is the most common cause of low well pressure and can often be fixed by draining the tank and letting the air valve recharge it.
  • Test your actual pressure with a $15 gauge before assuming the pump is the problem, because pressure below 40 psi and pressure that feels low are different issues.
  • Sediment buildup in the tank or a clogged intake screen at the well bottom requires either tank cleaning or a well service call, depending on where the blockage is.
  • An undersized pump that cannot meet your home's peak demand (multiple showers and laundry running at once) usually means upgrading to a larger pump, which a well contractor must do.

How to check and recharge your pressure tank

Your pressure tank stores water under air pressure so that the pump does not have to run every time you turn on a faucet. Over time, the air charge inside the tank leaks out or gets absorbed into the water, leaving the tank full of water but no air. When this happens, the pump runs constantly and pressure drops. You can test whether this is your problem by turning off the pump at the breaker, opening a faucet to drain the tank completely, and listening for air to hiss out. If you hear air, the tank still has charge. If you hear only water draining, the tank is waterlogged.

To recharge a waterlogged tank, turn off the pump and drain the tank fully by opening the lowest faucet in your house (usually a basement spigot or laundry sink). Once the tank is empty, locate the air valve on top — it looks like a tire valve on a car. Use a bicycle pump or air compressor to add air until the valve reads 2 psi below your pump's cut-in pressure (usually 38 psi if your pump turns on at 40 psi). Close the valve, turn the pump back on, and let it run until pressure reaches your normal range. This fix takes 30 minutes and costs nothing if you have a pump already.

If recharging the tank does not restore pressure, or if pressure drops again within a few days, the tank itself may be failing internally. Tanks last 10 to 15 years before the rubber bladder inside ruptures. A failed tank must be replaced, which requires a well contractor and costs between $800 and $2,000 depending on tank size.

Cleaning sediment from your pressure tank

Sediment — fine sand, silt, or mineral particles — can accumulate in your pressure tank over months or years, especially if your well is shallow or in an area with sandy soil. Sediment reduces the space available for water and air, which lowers pressure. You can check for sediment by turning off the pump, opening the lowest faucet, and letting water drain into a clear container. If the water is cloudy or brown, sediment is present.

To flush sediment from the tank, turn off the pump and open the lowest faucet to drain the tank completely. Locate the drain valve at the bottom of the tank (a small ball valve or gate valve) and attach a garden hose. Open the valve and let water run until it runs clear — this may take 15 to 30 minutes. Close the drain valve, turn the pump back on, and let it refill the tank. If sediment returns within a few weeks, the problem is coming from the well itself, not the tank, and you will need a well contractor to inspect the intake screen or install a sediment filter.

A whole-house sediment filter installed between the well and your home can prevent sediment from reaching your tank and fixtures. These filters cost $300 to $800 installed and need cartridge replacements every 6 to 12 months depending on how much sediment your well produces. If sediment is a recurring problem, a filter pays for itself in avoided tank cleaning and fixture damage.

Upgrading or replacing an undersized pump

If your pressure is low only when multiple fixtures run at once (two showers and a washing machine, for example), your pump may be too small for your home's peak demand. A 1-horsepower pump can deliver about 10 gallons per minute; a 1.5-horsepower pump delivers about 15 gallons per minute. If your home regularly needs more than what your pump can deliver, pressure drops because the pump cannot keep up.

You can estimate your home's demand by counting fixtures: each shower uses 2.5 gallons per minute, each toilet 1.5 gallons per minute, and a washing machine 2 gallons per minute. If you want two showers and a washing machine to run together without pressure dropping, you need a pump that delivers at least 7 gallons per minute. Most homes with 3 or 4 bedrooms need a 1.5-horsepower pump or larger.

Upgrading a pump requires a well contractor because the pump sits inside the well casing and must be pulled out, disconnected, and replaced. The cost ranges from $1,200 to $3,000 depending on well depth and pump size. Before you pay for an upgrade, confirm with a contractor that the well itself can sustain higher flow — some shallow wells cannot produce water fast enough to fill a larger pump's demand, and upgrading the pump will not help.

Checking for a clogged intake screen

At the bottom of your well, a screen prevents sand and sediment from entering the pump. Over time, this screen can become clogged with sediment, reducing the amount of water that can flow into the pump. If your pressure is low but your tank is charged and your pump is the right size, a clogged intake screen is a likely cause.

You cannot clean an intake screen yourself — it requires pulling the pump out of the well, which is a job for a well contractor. The contractor will remove the pump, inspect the screen, clean or replace it, and reinstall the pump. This service costs $500 to $1,500 depending on well depth. If your well is very shallow (under 25 feet), the cost is lower; if it is deep (over 100 feet), the cost is higher because pulling the pump takes longer.

Before you call a contractor for this job, ask them to test your well's recovery rate — the speed at which the well refills after water is drawn out. If the well cannot recover fast enough to keep up with your pump, cleaning the intake screen will not solve the problem, and you may need to reduce your water use or drill a new well.

Installing a booster pump for persistent low pressure

If your main well pump is working correctly but pressure is still too low for your needs, a booster pump can increase pressure without replacing the main pump. A booster pump sits between your pressure tank and your home's plumbing and adds extra pressure on top of what the main pump delivers. This is useful if your well naturally produces low pressure or if you have a long distance between the well and your house.

A booster pump system costs $1,500 to $3,000 installed and requires a separate pressure tank and electrical connection. It is usually a last resort after other causes have been ruled out, because it adds complexity and another piece of equipment that can fail. However, if your well is straightforward a low-producing well and you cannot afford to drill a new one, a booster pump is a practical option.

A well contractor can test your system and tell you whether a booster pump will solve your problem or whether the issue is something else. Some contractors offer a free pressure test and diagnosis, so it is worth calling for an estimate before you decide to install one.

When to call a well contractor

Call a well contractor if your pressure remains low after you have recharged the pressure tank and flushed sediment from it. A contractor can test your well's recovery rate, inspect the pump, and check the intake screen — all things that require equipment you do not have. Most contractors charge $150 to $300 for a diagnostic visit, and that fee is usually credited toward the cost of repairs if you move forward.

Get at least two estimates before you agree to a major repair like pump replacement or well service. Prices vary widely depending on your well depth, local labor costs, and the contractor's experience. Ask each contractor what they found during the test and why they recommend the repair they do — a good contractor will explain the problem in plain language and tell you what will happen if you do not fix it.

If a contractor recommends drilling a new well, get a second opinion. A new well costs $3,000 to $15,000 depending on depth and your area, and it should be a last resort after all other fixes have been tried.

Frequently Asked Questions

Can I increase water pressure by adjusting something on my pump?

Most well pumps have a pressure switch that tells the pump when to turn on and off, but adjusting it yourself is not recommended because it can damage the pump or create unsafe pressure. A well contractor can adjust the switch if it is set too low, which costs $100 to $200. Do not attempt this yourself.

Why does my pressure drop only at certain times of day?

If pressure is fine in the morning but drops in the evening when neighbors are watering lawns or using water, your well may not be recovering fast enough to meet peak demand. This is a well capacity problem, not a pump problem, and a booster pump or reduced water use is usually the only solution.

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

Low pressure can be a sign of a failing well, but it is usually caused by something else first — a waterlogged tank, sediment, or a clogged screen. A well contractor can test your well's water level and recovery rate to tell you whether the well itself is the problem. If the water level is dropping over months, the well may be failing.

How often should I have my well serviced?

Most well systems need a professional inspection every 2 to 3 years to check the pump, tank, and pressure switch. Annual water testing is also recommended to catch contamination early. Regular maintenance costs $200 to $400 per year but prevents expensive emergency repairs.

What is the normal water pressure for a well?

Most well systems are set to maintain pressure between 40 and 60 psi. Pressure below 40 psi is considered low and usually means something is wrong. Pressure above 60 psi can damage fixtures and is usually controlled by a pressure relief valve on the tank.