How to Tell if You Have a Gas Leak? December 4, 2025

A natural gas leak isn’t just inconvenient — it’s downright dangerous. And while we love a good bathroom pun here at WeCo, this is no laughing gas matter.

If you suspect you have a gas leak, stop reading this blog right now. Leave your house and call 911.

Your safety comes first, and this is one of those “do not DIY” situations. Even a small leak can lead to explosions, fire, or carbon monoxide poisoning. Trust us, you don’t want to be the reason your neighbors remember the day their eyebrows disappeared.

At Weco Rooter, a local, woman-owned plumbing company in Columbia, SC, we’ve helped many homeowners detect and repair gas leaks safely. This guide covers warning signs, emergency steps, prevention strategies, and when to call a pro.

How to Know If You Have a Gas Leak in Your House

Natural gas is odorless, but utility companies add mercaptan, which gives gas a distinctive rotten-egg or sulfur smell. According to NIOSH and the CDC, this odor is your first warning sign, but it can fade over time, so don’t rely on smell alone.

What Does a Gas Leak Smell Like?

Mercaptan provides that pungent odor — a clear red flag that something’s wrong. Odor fade can occur, especially in new lines or underground leaks, so act fast if you detect it. The CDC’s gas leak guidance explains why.

Common Signs of a Gas Leak in the House

Hissing or Whistling Noises from gas pipes or appliances.
Vegetation Issues — wilting or dead indoor/outdoor plants where a leak is nearby.
Bubbles in Puddles — indications of escaping gas underground.
Symptoms like Headaches or Nausea — signs of exposure to gas.
Unexpectedly High Gas Bills — can signal undetected leaks.

PHMSA’s consumer page lists what leaks look, sound, and smell like: Pipeline Leak Recognition and What to Do.

What to Do Immediately If You Suspect a Gas Leak

Emergencies demand action — do not delay. Don’t flip switches or use electronics, extinguish flames, ventilate, evacuate people and pets, and call for help from a safe location. See PHMSA’s DOs and DON’Ts: Recognize & Respond.

Step-by-Step Emergency Checklist

Avoid Electronics & Flames — no switches, lights, or ignition sources.
Extinguish Fire Sources — turn off stoves and blow out candles.
Shut Off Your Gas if you safely can.
Ventilate — open all doors and windows.
Evacuate Everyone — including pets.
Call for Help from a safe distance — call 911 or your gas provider.

Call a Licensed Plumber in Columbia, SC

After evacuating, you’ll need a trusted professional. Weco Rooter specializes in gas leak diagnosis and repair for Columbia homes, and we’re available 24/7 for emergencies.

How to Detect a Gas Leak Before It Gets Dangerous

Proactive detection is key to preventing disasters.

Use Gas Leak Detectors

Install a natural gas or combustible gas detector near gas appliances. These devices continuously monitor and alert you even when you can’t smell gas.

Periodic Professional Inspections

Schedule annual checks of your gas line and appliances. Annual inspections catch small problems before they become hazards. The CPSC urges yearly professional inspection of all fuel‑burning home heating systems: CPSC — Home Heating Equipment.

DOE’s technical brief covers combustion appliance safety and checks for fuel leaks: DOE Combustion Appliance Safety.

During home energy assessments, professionals often test for natural gas leaks: DOE — Home Energy Assessments (PDF).

What Causes Gas Leaks in Homes?

Common culprits include:

Aging or corroded pipes
Loose or faulty appliance connections
Poor installation
Soil shifts or nearby construction damage
Worn-out seals or valves

PHMSA outlines how many incidents originate from such failures.

Long-Term Gas Safety Tips for Homeowners

Install carbon monoxide (CO) detectors on every floor. (CPSC)
Keep appliances clean and properly vented. (DOE brief)
Know your gas shutoff valve location. (Ready.gov)
Replace old connectors with stainless steel flexible lines.
Schedule annual professional inspections — CPSC recommends regular fuel-burning appliance checks.

When to Call the Pros – Don’t DIY Gas Repairs

Gas line repairs are hazardous work. If you smell gas or suspect a leak, follow PHMSA’s emergency steps and always call a trained, licensed plumber. Weco Rooter has the tools, training, and safety protocols to get the job done right — and safely.

Trust Your Instincts and Protect Your Home

If you notice a strange smell, sound, or physical symptom — act like it’s a leak. It’s better to be safe than sorry. For fast, reliable gas leak services in Columbia, contact Weco Rooter today — your safety always comes first.