Well Water Has Bubbles? Air or Gas Explained

The Simple Test

Air vs Something Else

1. Fill a clear glass with cold water
2. Set it on counter and watch
3. Time how long bubbles last

What You'll See

Common Causes

1. Dissolved Air (Most Common)

• Air dissolved in water under pressure
• Released when pressure drops (at faucet)
• Like carbonation in soda
• Completely harmless
• More noticeable in cold water

2. Air in Lines

• After power outage
• After pump service
• Leak in suction line (jet pump)
• Check valve issue
• See: sputtering faucets article

3. New Water Heater

• Anode rod reaction can produce gas
• More common with hot water
• Often hydrogen gas
• Usually diminishes over time

4. Temperature Change

• Cold water holds more dissolved air
• When it warms, air releases
• More bubbles in cold weather

Dissolved Gases

Methane

• Natural gas in groundwater
• Odorless and colorless
• More common near oil/gas areas
• Can be flammable at high concentrations
• Requires venting if present

Signs of Methane

• Persistent bubbles that don't clear
• Water "fizzes" continuously
• Near oil/gas drilling areas
• Test if suspected

Hydrogen Sulfide

• Rotten egg smell
• Can produce bubbles
• Often accompanies sulfur odor
• Different issue—see sulfur articles

Carbon Dioxide

• Can dissolve in groundwater
• Makes water slightly acidic
• Bubbles out like soda
• May need pH adjustment

When to Be Concerned

Usually Not a Problem

• Bubbles that clear quickly
• No odor
• No other symptoms
• Water looks normal after bubbles clear

Consider Testing If

• Bubbles persist for minutes
• Any odor present
• You're in an oil/gas area
• Water catches fire (methane—rare but serious)
• Other water quality changes

Methane Safety

• At high concentrations: flammable
• Can accumulate in enclosed spaces
• If suspected, provide ventilation
• Don't smoke near well or tanks
• Professional testing recommended

Treatment Options

For Air (Usually No Treatment Needed)

• Cosmetic issue only
• Let water sit to degas
• Some filters reduce air content

For Air in Lines

• Check for leaks in system
• Verify check valve working
• Bleed air from system
• Fix source of air entry

For Methane

• Aeration/venting system
• Removes gas before it enters house
• Professional installation needed
• Cost: $1,000-$3,000

For Carbon Dioxide

• Aeration to release CO2
• pH adjustment may be needed
• Calcite filter raises pH

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 does my well water have tiny bubbles?

Usually dissolved air coming out of solution—harmless. If clears from bottom up in a minute, it's just air.

Is bubbly well water safe to drink?

Air bubbles: completely safe. If bubbles persist or have odor, test for dissolved gases like methane.

Why are bubbles worse in cold water?

Cold water holds more dissolved air. When it warms (in pipes or glass), air releases, creating more bubbles.

My water looks milky—is that the same?

Tiny bubbles can appear milky. If it clears from bottom up: bubbles. If clears from top: may be fine sediment.

Should I test my water for methane?

Only if: bubbles persist, you're in oil/gas area, or other concerns. Most bubbly well water is just air.