Why your well water pressure is low, and how to fix it
Start with the easy checks: a clogged sediment filter and the pressure gauge on your tank. Pumps typically turn on at 20 to 40 psi and shut off at 40 to 60. If pressure drops during heavy use and recovers later, the well may not keep up. Next suspects: a worn pump, a bad pressure switch, or a failing tank.
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Step 1: Is it one faucet or the whole house?
If only one faucet is weak, look at that fixture first. If every tap is weak, the problem is in the well system. The steps below are for whole-house low pressure.
Step 2: Check your filters
If you have a sediment filter or other cartridge filter, look at it. Nebraska Extension says flow through a cartridge drops as it traps material, and to clean or replace the cartridge when you notice the flow drop. Virginia Cooperative Extension says to follow the manufacturer's schedule.
Step 3: Read the pressure gauge on the tank
Most well systems have a pressure tank with a pressure switch at or near it. Penn State Extension gives an example: the pump fills the tank until pressure reaches about 40 psi (pounds per square inch), then shuts off. When pressure falls to about 20 psi, the switch turns the pump back on. Nebraska Extension says the shutoff point is typically 40 to 60 psi and the turn-on point 20 to 40 psi.
Run a faucet and watch the gauge:
| What the gauge does | Likely cause |
|---|---|
| Stays low and the pump keeps running | The pump isn't keeping up: worn pump, low well water level, or a clog |
| Drops fast and the pump clicks on and off often | Pressure tank problem. Nebraska Extension says a waterlogged tank makes the pump run nearly every time you use water. |
| Drops to the low setting and the pump doesn't start | Pressure switch or electrical problem |
| Normal, but taps are still weak | A clog between the tank and the taps, often a filter |
Your settings may differ from 20 and 40 psi. Nebraska Extension says the switch is set by the manufacturer or installer and can usually be adjusted. Check the label on the switch or ask a pump installer.
If pressure fades during heavy use, the well may be low-yielding
Penn State says a low-yielding well can't meet peak demand, the morning or evening rush of showers, laundry, and dishes. The water level in the well drops and the pump can't refill the pressure tank as fast as you draw from it. It's worse in late summer and early fall, when groundwater is lowest.
Try spreading out water use: laundry on different days, showers at different times. If that helps, Penn State lists water-saving fixtures and an intermediate storage tank (a large holding tank that the well refills slowly) as longer fixes.
Iron, iron bacteria, and sand can clog the system
Minnesota says iron can clog wells, pumps, and appliances over time, and iron bacteria can cut how much water the well produces and cause clogging. Penn State's drought fact sheet also names iron bacteria and sediment as causes of restricted flow from the well. Wisconsin says sand and silt can damage your pump.
If you see orange slime, rust stains, or grit, those pages can help: slimy residue, orange or brown stains, and sand in well water.
The most common cause of lost water is the pump
Penn State says the most frequent reason a well stops producing water is a malfunctioning or worn-out submersible pump. Other causes it lists are a bad pressure switch at the tank and a pressure tank that needs replacing, since tanks wear out over time.
When to call a pro
Call a licensed pump installer if the gauge points to the pump, switch, or tank, or if the pump runs constantly. Penn State recommends a well driller or competent plumber to find the exact cause. Turn off power to the pump before anyone opens the switch or drains the tank.
Questions people ask
What should my well water pressure be?
Nebraska Extension says common switch settings turn the pump on at 20 to 40 psi and off at 40 to 60 psi. Penn State's example runs between 20 and 40 psi. Check the label on your pressure switch.
Why did my well water pressure suddenly drop?
A sudden whole-house drop often points to the pump, the pressure switch, or the tank. Penn State says a worn-out pump is the most common reason a well stops producing water. A clogged filter is the easiest thing to check first.
Can a bigger pressure tank fix low pressure?
Penn State says a larger tank stores only slightly more usable water. In its example, a 42-gallon tank gives about 8 gallons before the pump starts. A bigger tank alone won't fix a low-yielding well.
Does low water pressure mean my well is going dry?
It can, especially in a drought or late summer. Penn State says the most frequent reason a well stops producing water is a worn-out pump, so have a pump installer check before assuming the well is dry.
Where this comes from
- Penn State Extension, Water Facts 3, Using Low-Yielding Wells
- Penn State Extension, Water Facts 7, Managing Your Well During a Drought
- Wisconsin DNR, My Water Appears Bubbly
- Minnesota Department of Health, Iron in Well Water
- Minnesota Department of Health, Iron Bacteria in Well Water
- Virginia Cooperative Extension, Household Water Treatment
- Wisconsin DNR, My Water Appears Sandy or Gritty
- Nebraska Extension, Private Drinking Water Wells, The Distribution System
- Nebraska Extension, Drinking Water Treatment, Sediment Filtration