Low pressure on a well system usually comes from a clogged sediment filter, a waterlogged pressure tank, or a failing pump — and the fix depends on which one

Well water pressure drops when something blocks the flow between the well and your house, or when the tank that stores pressurized water loses its air charge. The most common culprits are a sediment filter full of rust and minerals, a pressure tank that has absorbed water instead of holding air, or a pump that is losing power. You can test the tank yourself and clean a filter in an afternoon. A pump replacement or well service usually requires a professional.

Start by checking your pressure gauge — most systems have one mounted near the pressure tank. Normal household pressure is 40 to 60 pounds per square inch (PSI). If your gauge reads below 40 PSI, or if pressure drops suddenly, work through the steps below in order. Each one takes minutes and costs nothing.

Key Takeaways

  • Check your pressure tank's air charge first by turning off power to the pump, draining the tank, and listening for air when you open a valve — a hissing sound means the tank still holds air and may need recharging.
  • A clogged sediment filter is the easiest fix: shut off the pump, unscrew the filter housing, replace the cartridge, and turn the pump back on.
  • If pressure drops only at one faucet or fixture, the problem is downstream of the tank — a clogged aerator or valve — and does not require well service.
  • Pressure tanks lose their air charge over years of normal use and can be recharged with a bicycle pump if you have the right valve, or replaced if the tank itself is corroded.
  • A pump that runs but delivers weak pressure, or one that cycles on and off every few minutes, usually needs professional inspection or replacement.

Test and recharge your pressure tank

The pressure tank stores water under air pressure so your pump does not run every time you turn on a faucet. Over time, the air bladder inside the tank absorbs water and loses pressure. You can test this yourself in about ten minutes.

Turn off power to the pump at the breaker. Open a faucet inside the house and let water drain until nothing comes out — this empties the tank. Close the faucet. Now locate the air valve on top of the tank (it looks like a bicycle tire valve) and press it with your finger. If you hear a hiss of air, the tank still holds some charge. If nothing comes out, the tank is waterlogged and needs recharging or replacement.

If the tank still has air, you can try recharging it. Use a bicycle pump with a gauge to add air until the tank reads 2 PSI below your pump's cut-in pressure — usually 38 PSI if your pump is set to cut in at 40 PSI. Check your pump's pressure switch or ask your well contractor what the setting is. Recharging works best on tanks less than ten years old. Older tanks or tanks that lose pressure again within weeks usually need replacement, which requires a licensed well contractor.

Replace a clogged sediment filter

Sediment filters catch rust, sand, and minerals from the well before water reaches your house. A full filter blocks pressure and reduces flow. Most systems have a filter housing with a replaceable cartridge mounted near the pressure tank.

Turn off the pump at the breaker. Locate the filter housing — it is usually a white or blue cylinder with a bowl-shaped bottom. Place a bucket underneath and unscrew the bowl by hand or with a filter wrench (a specialized tool you can rent from a hardware store for a few dollars). The old cartridge will slide out. Rinse the bowl and housing with clean water, insert a new cartridge of the same size and micron rating, and screw the bowl back on hand-tight. Turn the pump back on and check for leaks around the housing.

If you do not know what size cartridge your filter uses, take a photo of the housing label or the old cartridge and bring it to a plumbing supply store. Cartridges cost between $15 and $50 depending on the type. Replace the filter every six to twelve months if you have high sediment, or every one to two years for cleaner wells. A full filter is one of the easiest pressure problems to fix yourself.

Check for clogs downstream of the tank

If your pressure is low at only one faucet or shower, the problem is not your well system — it is something between the tank and that fixture. The issue is usually a clogged aerator (the screen at the faucet tip) or a stuck valve.

Unscrew the aerator from the faucet tip and rinse it under running water. If you see sediment or mineral buildup, soak it in white vinegar for an hour and scrub with an old toothbrush. Screw it back on and test. If pressure is still low at that fixture only, the shutoff valve under the sink or the supply line itself may be partially blocked. You can try opening the shutoff valve all the way (turn the handle until it is parallel to the pipe), but if that does not help, the line may need flushing by a plumber.

Low pressure at all fixtures points back to the tank or filter, not to individual faucets. Use the tests above to narrow it down.

Recognize when you need a well contractor

Some pressure problems require professional service. Call a licensed well contractor if your pump runs constantly but delivers weak pressure, if the pump cycles on and off every few minutes even after you have recharged the tank, or if pressure drops suddenly and the tank and filter are both clean.

A pump that runs without building pressure usually means the pump itself is failing — the internal seals are worn or the impeller is damaged. A pump that cycles too often may have a failing check valve (a one-way valve that prevents backflow) or a leak in the pressure line. Both of these require opening the well or replacing the pump, which is licensed work in most states.

If your well is more than twenty years old and pressure has been declining gradually, the pump may straightforward be reaching the end of its life. A new submersible pump costs between $1,500 and $3,500 installed, depending on well depth and pump size. Get quotes from at least two contractors before deciding.

Maintain your system to prevent pressure loss

Regular maintenance keeps pressure stable and extends the life of your pump. Replace your sediment filter on schedule — do not wait until pressure drops. Check your pressure gauge monthly and note any gradual decline. If pressure drops 5 PSI or more over a few months, have the tank tested by a contractor before the pump wears out trying to compensate.

Keep the area around your pressure tank and pump clean and dry. Rust on the tank or corrosion on fittings can indicate a leak or moisture problem that will eventually damage the pump. If you notice rust forming on the tank itself, have a contractor inspect it — a corroded tank cannot be recharged and will need replacement.

If you have very hard water or high sediment, consider installing a whole-house filter ahead of your pressure tank. This protects the pump and tank from mineral and sediment buildup and can extend the life of both by years. A whole-house filter system costs $300 to $800 installed and requires cartridge changes every six to twelve months.

Frequently Asked Questions

Can low water pressure damage my well pump?

Yes. If the pump runs constantly trying to build pressure it cannot reach, the motor overheats and wears out faster. A pump that cycles every few minutes is working harder than it should. If you notice either pattern, have the system checked within a week or two — waiting months can shorten the pump's life by years.

Why does my pressure drop only in winter?

Cold can thicken oil in the pump motor and reduce its efficiency, and frozen sediment in the filter can block flow. If pressure returns to normal in spring, the filter may need cleaning or the pump may need professional service. If the problem is severe, insulating the tank and pump with foam can help.

Is it safe to recharge the pressure tank myself?

Yes, if you use a bicycle pump and follow the steps above. Do not use an air compressor — the pressure can exceed what the tank is rated for and damage it. If you are unsure of your pump's pressure settings, ask a contractor before recharging.

What is the difference between a pressure tank and a water softener?

A pressure tank stores water under air pressure and keeps the pump from running constantly. A water softener removes minerals like calcium and magnesium that cause hard water. Some systems have both. A clogged sediment filter affects pressure; hard water does not, though it can clog filters faster.

How often should I have my well system serviced?

Most contractors recommend an annual inspection, especially if the system is more than ten years old. At minimum, have the water tested once a year for bacteria and minerals, and have the pump and tank checked if you notice any change in pressure, flow, or noise.