Note to readers: This post was updated on July 25, 2026 to reflect current gas leak safety guidance and add links to our gas line and earthquake shut-off resources. We refreshed the details below so the advice reflects how we approach this work today.
A gas fire or leak is one of the fastest-moving emergencies a home or business can face. In one recent case, a faulty gas appliance at a Sierra Madre restaurant caught fire and forced the business to shut down until a plumber could replace the failed unit the same day. Most gas emergencies build up more quietly — a slow leak, an aging connector, a corroded valve — but the risk is the same: fire, explosion, or carbon monoxide exposure.
How Gas Leaks Usually Start
Gas leaks are rarely sudden. They typically come from:
- Old or corroded gas line fittings and connectors
- A gas appliance (water heater, oven, furnace) that’s malfunctioning or was installed incorrectly
- Ground shifting or seismic activity that stresses rigid gas piping
- Wear and tear on flexible connectors behind ovens and dryers
Signs You May Have a Gas Leak
- A rotten-egg or sulfur smell near appliances, meters, or along exterior walls
- A hissing sound near a gas line or appliance connection
- Dead or discolored vegetation in a patch of yard near underground gas lines
- Higher than normal gas bills with no explanation
- Pilot lights that won’t stay lit, or flames that burn orange instead of blue
What to Do If You Smell Gas
If you smell gas, don’t try to find the source yourself. Leave the building, avoid flipping light switches or using anything that could spark, and call your gas utility and a licensed plumber from a safe distance. Don’t go back in until a professional confirms it’s safe.
Reducing Your Risk
Older homes in Sierra Madre and the surrounding San Gabriel Valley are more likely to have aging gas lines, especially if the property hasn’t had a plumbing inspection in years. A few practical steps help:
- Have gas lines and appliance connections inspected periodically, especially in homes over 20 years old
- Install an earthquake gas shut-off valve, which automatically cuts gas flow if ground movement is detected — a real risk in our area
- Know where your main gas shut-off is located before you ever need it
- Replace flexible appliance connectors that show cracking, rust, or wear
Western Rooter’s licensed plumbers handle gas line repair and installation throughout Sierra Madre, Pasadena, and Arcadia. If you suspect a leak, need a gas appliance replaced, or want to talk about an earthquake shut-off valve for your property, give us a call — we handle these calls around the clock.
