Gas smell near the water heater

Symptoms

• Sulfur or rotten-egg smell (added gas odorant) near the unit
• Smell is present even when the unit isn't actively firing
• May be stronger near specific fittings or the gas valve
• Could be accompanied by a hissing sound

Likely causes

• CommonLeaking gas fitting or connectionA loosened or corroded fitting on the gas line can leak small amounts of gas continuously.
• PossibleFaulty gas control valveAn internal valve failure can allow gas to escape even when the unit is off.
• PossibleDamaged gas supply linePhysical damage or corrosion to the flexible or rigid gas line can create a leak.

What to do

1. Do not turn any switches on or off, light anything, or use your phone near the smell.
2. Leave the house or area immediately, opening doors on your way out if you safely can.
3. Call your gas utility's emergency line or 911 from outside the home, well away from the smell.
4. Do not attempt to locate or fix the leak yourself, and do not go back inside until the gas company or fire department says it's safe.
5. Once cleared, have a licensed plumber or gas technician inspect and repair the specific source of the leak.
6. Don't restore gas service or relight the pilot until the leak has been professionally confirmed as fixed.

Tools and parts

• None; this is an evacuate-and-call situation

When to call a pro

Only a licensed plumber or gas technician, coordinated with your gas utility, should diagnose and repair a gas leak.

Safety