Air in Well Water Lines: Causes & Solutions

Symptoms of Air in Lines

What You'll Notice

• Sputtering or spitting faucets
• Bursts of air mixed with water
• White, milky appearance (dissolves quickly)
• Inconsistent water flow
• Banging pipes (water hammer)
• Pressure gauge fluctuations

When It Happens

• After power outage (temporary, normal)
• After pump runs for a while
• During dry season
• Consistently at certain times

Not Air (Different Problem)

• Milky water that stays white = air
• Milky water that clears from bottom up = air bubbles
• Milky water that clears from top = fine sediment

Common Causes

1. Dropping Water Level

Most common cause of persistent air.

• Water level drops below pump intake
• Pump draws air instead of water
• Common during drought or dry season
• May indicate well yield declining

2. Pump Set Too Shallow

• Pump above lowest water level
• Water level varies; pump sometimes exposed
• May need to lower pump

3. Waterlogged Pressure Tank

• Bladder tank loses air charge
• Tank becomes waterlogged
• Causes rapid cycling
• Can introduce air into lines

4. Failed Check Valve

• Check valve prevents backflow
• Failed valve allows water to drain back
• Air enters when pump isn't running
• Air pushed into lines when pump starts

5. Leak in Drop Pipe

• Crack or loose connection in pipe
• Allows air to enter below water level
• Persistent air regardless of water level

6. Gas in Groundwater

• Methane or other dissolved gases
• Released when pressure drops (at faucet)
• Natural occurrence in some areas
• Requires aeration or venting

7. After Power Outage (Normal)

• Water drains from lines during outage
• Air fills empty space
• Purges when power returns
• Should clear within minutes

Diagnosing the Problem

Questions to Answer

• Did it start suddenly or gradually?
• Does it happen all the time or certain conditions?
• Has there been a drought or heavy use?
• Does pump run longer before pressure builds?

Check These First

1. Pressure tank: Tap tank—sounds hollow = waterlogged
2. Tank air charge: Should be 2 PSI below cut-in (typically 38 PSI for 40/60)
3. Pressure gauge: Watch while pump runs—erratic = problem

Professional Diagnosis

• Camera inspection of well
• Water level measurement
• Flow test
• Check valve inspection

Solutions

Temporary Air (Post-Outage)

1. Run cold water faucet (basement or ground floor best)
2. Let run until water flows steadily
3. May take several minutes
4. All faucets should then be normal

Pressure Tank Issues

• Check air charge: Pump off, drain tank, check with tire gauge
• Recharge if low: Add air to 2 PSI below cut-in
• If bladder failed: Replace tank
• Cost: $300-$800 for tank replacement

Low Water Level

• Temporary: Reduce water use, let well recover
• Lower pump: If there's room in well
• Tailpipe: Extend intake deeper
• Storage tank: Buffer low-yield well
• May need: Well deepening or new well

Check Valve Replacement

• Requires pulling pump (submersible)
• Replace foot valve or in-line check valve
• Often done during pump service
• Cost: $500-$1,500 (depending on well depth)

Dissolved Gas

• Install aeration system
• Vent gas before pressure tank
• May need water treatment professional

We service all major pump brands including Franklin Electric, Grundfos, Goulds (Xylem), and Sta-Rite (Pentair). Our trucks carry common parts and components for same-day repairs.

Frequently Asked Questions

Why is there air in my well water lines?

Common causes: low water level, bad check valve, waterlogged tank, or pump set too shallow. After power outage is normal and temporary.

How do I get air out of well water lines?

Run water until air clears. If persistent, check pressure tank air charge, inspect check valves, or have water level measured.

Is air in water harmful?

Generally no—just annoying. Exception: methane gas requires venting for safety. Persistent air may indicate bigger problem.

Why does my water sputter in dry season?

Likely low water level. Well may not keep up with demand. Reduce use and let recover. May need deeper pump or storage tank.

My pressure tank sounds different—is that related?

Yes—hollow sound indicates waterlogged tank (no air cushion). Needs air charge or replacement.