Well Losing Water Pressure: Causes & Troubleshooting

Weak showers, slow-filling toilets, and faucets that trickle instead of flow—low water pressure makes daily life frustrating. Here's how to diagnose what's causing your well system's pressure problems.

Quick Diagnostic: Is It the Well or the House?

Before diving into causes, determine where the problem is:

1. Check an outdoor hose bib (closest to the well/pressure tank)
2. If outdoor pressure is good but indoor is low → Problem is in house plumbing
3. If outdoor pressure is also low → Problem is well system

This guide focuses on well system causes. For indoor-only problems, check for clogged aerators, old pipes, or partially closed valves.

Common Causes of Low Well Pressure

1. Waterlogged Pressure Tank (Most Common)

Symptoms:

• Pump cycles every few seconds when water is running
• Pressure fluctuates wildly
• Tank feels solid/heavy when tapped (should be partly hollow)

What's happening: The bladder or diaphragm has failed. Water fills the entire tank, leaving no air cushion. Without air cushion, pressure drops instantly when you open a faucet.

Fix: Replace pressure tank ($400-$800 installed)

2. Low Pressure Tank Air Charge

Symptoms:

• Pressure doesn't hold as long as it used to
• Pump cycles more frequently than normal
• No obvious tank damage

What's happening: The air charge in the tank has leaked out. This is different from bladder failure—the bladder is intact but underinflated.

Fix: Add air to tank (should be 2 PSI below cut-in pressure). DIY with bike pump or compressor.

3. Failing or Failed Pump

Symptoms:

• Pump runs but pressure never builds to cut-off
• Pressure builds very slowly
• No water at all (pump failure)

What's happening: Pump impellers are worn, motor is failing, or pump has completely died.

Fix: Pump replacement ($1,500-$4,000+ depending on depth)

4. Clogged Sediment Filter

Symptoms:

• Good pressure at tank, low pressure after filter
• Gradual pressure loss that gets worse over time
• Filter looks dirty or hasn't been changed in months

What's happening: The filter has trapped so much sediment it's restricting flow.

Fix: Replace filter cartridge ($10-$50). Set reminder to change regularly.

5. Partially Closed Valve

Symptoms:

• Pressure problems started after plumbing work
• Good pressure in some areas, not others

What's happening: A gate valve or ball valve somewhere in the system isn't fully open.

Fix: Locate and fully open all valves. Check near pressure tank, water heater, and main house supply.

6. Leaking Pipe or Fitting

Symptoms:

• Pump runs more often than normal
• Wet spots in yard or near wellhead
• Water bill (if metered) has increased

What's happening: Water is escaping before reaching the house, causing pressure loss and wasting water.

Fix: Locate and repair leak. May require excavation if pipe is buried.

7. Pressure Switch Problems

Symptoms:

• Pump doesn't turn on when pressure drops
• Pump turns on/off at wrong pressures
• Erratic pressure behavior

What's happening: The pressure switch contacts are worn, corroded, or misadjusted.

Fix: Adjust or replace pressure switch ($100-$200 installed)

8. Declining Well Yield

Symptoms:

• Pressure drops during heavy use (multiple fixtures)
• Takes longer to recover after heavy use
• Problem worse during dry seasons
• Neighbors reporting similar issues

What's happening: The well can't produce water as fast as you're using it. The water table may have dropped.

Fix: Options include lowering pump, storage tank, or drilling deeper. See our declining yield guide.

Step-by-Step Troubleshooting

Step 1: Check the Pressure Gauge

Find the gauge on or near the pressure tank. Note the reading.

• Normal: 40-60 PSI (or 30-50 PSI on older systems)
• Too low: Below 20 PSI indicates a problem
• Fluctuating: Rapid changes suggest waterlogged tank

Step 2: Observe Pump Cycling

Run water and watch/listen to the pump:

• Rapid cycling (every few seconds): Waterlogged tank
• Runs continuously: Leak, low yield, or failing pump
• Won't turn on: Electrical problem or switch failure
• Normal cycling but low pressure: Clogged filter or pipe restriction

Step 3: Check the Breaker

Sometimes the simplest answer is right. Verify the well pump breaker hasn't tripped. If it trips repeatedly, there's an electrical issue requiring professional diagnosis.

Step 4: Inspect Filters

If you have a sediment filter or water treatment system, check for clogged cartridges. Many pressure problems are simply dirty filters.

Step 5: Look for Leaks

Walk the area between well and house. Look for:

• Wet spots or muddy areas
• Unusually green grass patches
• Water around wellhead or pressure tank

When to Call a Professional

• Pump won't build pressure at all
• Breaker keeps tripping
• Tank needs replacement
• You can't find the cause
• Problem involves electrical components
• Well yield may be declining

Repair Costs

Frequently Asked Questions