A natural gas leak is one of the most serious home emergencies you can face. Knowing how to recognize one — and what to do in the first 60 seconds — can save your life. This guide covers the warning signs, the immediate response, and when to call a plumber for gas line repair.
Signs of a Natural Gas Leak
The Smell
Natural gas is odorless on its own. Gas companies add mercaptan, a chemical compound that smells like rotten eggs or sulfur. If you smell rotten eggs in your home — especially near appliances, the gas meter, or in the basement — treat it as a gas leak until proven otherwise.
The smell doesn't have to be strong. A faint rotten egg smell that you notice intermittently is worth investigating. Don't wait to see if it gets stronger.
The Sound
A significant gas leak often produces a hissing or whistling sound near the pipe or appliance. If you hear this near your gas line, water heater, furnace, range, or dryer — evacuate and call 911.
Physical Symptoms
Prolonged exposure to natural gas causes headache, dizziness, nausea, and fatigue. If multiple people in the home feel unwell and improve when you go outside, gas leak is a possible cause. Carbon monoxide poisoning has similar symptoms but different causes — both are serious.
Visual Signs Outside the Home
- Dead or dying vegetation in a line or patch in the yard (gas escaping from underground supply line kills plant life)
- Bubbling in wet soil or puddles near the gas line route
- Dirt or dust blowing from the ground without wind
- A white cloud or fog near the gas meter or underground line path
Appliance Warning Signs
- Gas appliance pilot light that frequently goes out
- Yellow or orange flame on a gas burner (should be blue — yellow/orange indicates incomplete combustion and possible leak or combustion issue)
- Increased gas bills without change in usage
What to Do If You Smell Gas — Immediately
DO:
- Get everyone (including pets) out of the home immediately. Don't stop to gather belongings.
- Leave the door open as you exit to help ventilate.
- Once outside and away from the home, call 911 and your gas provider emergency line.
- Atmos Energy (serves most Knoxville area): 1-866-322-8667
- Talbott Gas (some rural areas): check your bill for the emergency number
- Call Honey Bear Plumbing at (865) 284-2424 for gas line repair once the utility has confirmed it's safe to re-enter.
DO NOT:
- Don't turn any light switches on or off — electrical sparks can ignite gas
- Don't use your phone inside the home
- Don't use any appliances
- Don't light matches or lighters
- Don't try to find the leak yourself
- Don't turn the gas back on yourself — that's the utility's job
After the Utility Clears the Home
Once Atmos Energy or 911 responders have assessed the leak and cleared the home, you'll need a licensed plumber to:
- Locate the source of the leak
- Repair or replace the failed section of gas line
- Pressure-test the line to confirm the repair is sound
- Restore all gas appliances to safe operation
Honey Bear Plumbing is licensed for gas line repair in Tennessee. We serve all of Greater Knoxville. Call (865) 284-2424.
Common Causes of Residential Gas Leaks in Knoxville
Corroded or aging gas lines: Many older Knoxville homes have black iron gas pipe that can corrode at joints and fittings over decades. Flexible corrugated stainless steel tubing (CSST), used in newer homes, can be punctured by driving nails or screws through walls.
Loose or faulty appliance connections: The flexible gas connector between the wall shutoff and the appliance — behind the range, dryer, or water heater — is a common failure point. These connectors should be inspected periodically and replaced every 10–15 years.
DIY work gone wrong: Connections that weren't properly threaded or sealed, or gas line work done without permits. Gas line work requires a licensed plumber in Tennessee — no exceptions.
Earthquake or ground movement: Rare in Knoxville but not impossible — ground shifting can stress underground gas line connections.
Gas Line Maintenance — Prevent Problems Before They Start
Annual gas appliance inspection: Include a check of all gas connections when your HVAC is serviced each fall. Water heater, range, and dryer connections should be visually inspected and occasionally tested with soapy water (bubbles = leak).
Know where your gas shutoff is: The main shutoff is usually at the meter on the side of the house. It requires a wrench or gas shutoff tool to operate. Know where it is before you need it.
Don't bury the gas meter or valve: Keep vegetation and clutter away from your gas meter for emergency access.
Frequently Asked Questions
What does a gas leak smell like?
Natural gas companies add mercaptan, which smells like rotten eggs or sulfur. Even a faint smell should be taken seriously. If you smell it inside your home, evacuate and call 911.
Can a gas leak make you sick?
Yes. Natural gas displaces oxygen and at high concentrations causes dizziness, headache, nausea, and loss of consciousness. If you feel sick and the symptoms improve when you go outside, vacate and investigate.
How do plumbers find gas leaks?
Licensed plumbers use electronic gas detection equipment, soap-bubble testing, and pressure testing to locate leaks. Visual inspection alone is not sufficient for small leaks.
How much does gas line repair cost in Knoxville?
Minor gas line repairs (replacing a fitting or connector) run $300–$600. More extensive line repair or replacement runs $600–$2,000+ depending on length and access. Emergency after-hours service adds $100–$250.
Can I fix a gas line myself?
No. Gas line work in Tennessee requires a licensed plumber or HVAC contractor with gas line certification. DIY gas line work is illegal and extremely dangerous.
Licensed Gas Line Repair in Knoxville, TN
Honey Bear Plumbing is licensed for gas line repair and installation throughout Greater Knoxville and surrounding counties. If you've had a gas leak, or suspect a problem with your gas lines, call us.
Call (865) 284-2424 — gas line emergencies get immediate priority.