Low Water Pressure From a Well: Causes and Fixes

Low water pressure from a well can be frustrating. The cause might be simple—a stuck pressure switch or a clogged faucet aerator—or it could indicate a declining well or failing pump. Here's how to narrow it down and when to call a professional.

Common Causes

1. Pressure Tank or Switch

The pressure tank and switch control when the pump runs. If the switch is misadjusted, stuck, or failing, you may get low or inconsistent pressure.

Signs: Pressure fluctuates, pump cycles too often or not at all, tank feels empty or waterlogged

Fix: A pump contractor can test and adjust or replace the pressure switch and tank. This is typically a pump/plumbing issue, not a well drilling issue.

2. Pump Problems

A submersible pump can lose efficiency over time—worn impellers, motor issues, or electrical problems. Jet pumps above ground can develop similar issues.

Signs: Gradual pressure decline, pump runs but delivers little water, unusual noises

Fix: Pump repair or replacement. A pump contractor (C-61/D-21) or a C-57 driller who also does pump work can help. If the pump is in the well and needs to be pulled, a well driller may be involved.

3. Plumbing and Fixtures

Restrictions in pipes, clogged aerators, or undersized plumbing can reduce flow at the tap.

Signs: Low pressure at some fixtures but not others, pressure improved after cleaning aerators

Fix: Clean aerators, check for leaks, consider pipe condition and sizing. Usually a plumber or homeowner task.

4. Well Yield Decline

If the well itself is producing less water—due to drought, over-pumping, screen clogging, or sediment—the pump may be drawing from a depleted or restricted source.

Signs: Pressure drops during sustained use, recovery is slow, problem worsens over time or during drought

Fix: A C-57 licensed well driller can assess well yield, perform well rehabilitation (cleaning, surging), or recommend deepening or a new well. See our guide to my well ran dry for options.

5. Sediment or Screen Clogging

Over time, sediment, mineral deposits, or bacterial growth can reduce flow into the well. The screen or borehole may be partially blocked.

Signs: Gradual decline, possibly accompanied by sand or sediment in the water

Fix: Well rehabilitation (cleaning, surging, acid treatment) by a C-57 contractor. In severe cases, deepening or a new well may be needed.

DIY Checks (Before Calling a Pro)

1. Test multiple fixtures — If only one faucet is low, it's likely that fixture or its supply line.
2. Clean aerators — Mineral buildup can restrict flow; unscrew and rinse.
3. Check the pressure gauge — On the pressure tank; normal is often 30–50 psi. If it's low or doesn't rise when the pump runs, the pump or switch may be the issue.
4. Listen to the pump — Does it run when you use water? Does it cycle on and off rapidly? Note any unusual sounds.

When to Call a Professional

• No water at all — Pump may have failed or well may be dry
• Pressure has declined steadily — Could be well yield or pump
• Pressure drops during normal use and recovers slowly — May indicate well or pump capacity issues
• Sand or sediment in the water — Well or screen may need attention
• You've ruled out simple causes — Get a professional assessment

Who to Call

• Well-related issues (yield, screen, rehabilitation, deepening): C-57 Well Drilling Contractor
• Pump-only issues (motor, switch, tank): Pump contractor (C-61/D-21) or a C-57 who does pump work

When unsure, start with a well driller—they can determine whether the problem is the well or the pump.

Find a Licensed Driller

For well assessment, rehabilitation, deepening, or new construction, use our California Well Driller Directory to find C-57 licensed contractors in your area.