Low Water Pressure from a Well: Causes and Fixes
Low Water Pressure from a Well: Causes and Fixes
Low water pressure is one of the most common well system complaints — and most of the time, it's not the pump. Here are the 7 most common causes and how to fix each one.
7 Causes of Low Well Water Pressure
1. Waterlogged Pressure Tank
Most CommonA failed pressure tank bladder means the tank has no air cushion. The pump must start every time any water is drawn, and pressure drops immediately when the pump stops. Tap the tank — a waterlogged tank sounds solid throughout. Fix: replace the pressure tank.
Pressure tank service →2. Incorrect Pressure Switch Settings
CommonMost well systems are set to 30/50 PSI (pump on at 30, off at 50). If your household needs higher pressure, the switch can be adjusted to 40/60 or 50/70 — but only if the pump and tank can support the higher pressure. Never adjust the pressure switch without checking the pump rating.
3. Clogged Sediment Filter
CommonA whole-house sediment filter that hasn't been changed in months can restrict flow significantly. Check and replace the filter cartridge — this is the first thing to check when pressure drops suddenly.
4. Scale Buildup in Pipes
Common in Hard Water AreasHard water deposits calcium scale inside pipes over years, gradually reducing the pipe diameter and flow rate. This causes pressure that decreases slowly over time. Fix: water softener to prevent future buildup; pipe replacement for severely scaled pipes.
5. Failing Well Pump
Less CommonA pump that is wearing out produces less pressure and flow. Signs: pressure that gradually decreases over months, pump that runs longer than usual, or pressure that drops significantly under simultaneous use. Diagnosis requires measuring pump output at the pressure tank.
6. Low-Yield Well
Less CommonSome wells in Southern Maryland — particularly in Calvert County — have limited flow rates. If the well cannot replenish water as fast as it's being used, pressure drops during high-demand periods (morning showers, irrigation). Fix: storage tank, constant pressure system, or well deepening.
7. Partially Closed Shutoff Valve
Rare but Easy to FixA shutoff valve that was partially closed during a repair and not fully reopened will restrict flow. Check all shutoff valves in the system — they should be fully open.
Diagnosing Low Pressure: What We Check
Frequently Asked Questions
What causes low water pressure from a well?
The most common causes are: a waterlogged pressure tank, incorrect pressure switch settings, a clogged sediment filter, scale buildup in pipes from hard water, a failing well pump, a low-yield well, or a partially closed shutoff valve.
What is normal water pressure for a well system?
Normal residential water pressure is 40–80 PSI. Most well systems cycle between 30 PSI (pump on) and 50 PSI (pump off). Pressure below 30 PSI at the tap is considered low.
Can I increase water pressure from my well?
Yes — in most cases. If the pressure tank is correctly sized and the pump is functioning, adjusting the pressure switch to a 40/60 or 50/70 setting increases pressure. A constant pressure system maintains consistent pressure regardless of demand.