Gas Line Leak Signs: What to Look For and What to Do in Maryland
July 5, 2026 · 5 min read · By Deep Dive Plumbing Maryland
If you smell gas: Do not operate any electrical switches. Leave the house immediately. Call 911 and your gas company from outside. Do not re-enter until cleared by the gas company.
Gas leaks are rare but serious. Knowing the warning signs can save your life. Here are the signs of a gas line leak and what to do if you suspect one.
Warning Signs of a Gas Leak
Rotten egg or sulfur smell
Natural gas is odorless — gas companies add mercaptan to give it a distinctive rotten egg smell. Any sulfur smell near gas appliances or pipes is a warning sign.
Hissing or whistling sound
A hissing sound near a gas line, meter, or appliance connection indicates gas escaping under pressure.
Dead or dying vegetation
A patch of dead grass or plants in an otherwise healthy yard, especially in a line pattern, can indicate an underground gas leak.
Bubbling in standing water
Gas escaping from an underground line can cause bubbling in puddles or wet soil near the line.
Higher than normal gas bills
A sudden unexplained increase in gas usage can indicate a leak in the system.
Physical symptoms
Headaches, dizziness, nausea, or fatigue that improve when you leave the house can indicate carbon monoxide or gas exposure.
Frequently Asked Questions
What should I do if I smell gas in my house?
Do not turn any electrical switches on or off. Do not use your phone inside. Do not light any flames. Leave the house immediately, leaving doors open as you go. Once outside, call 911 and your gas company from a safe distance. Do not re-enter until the gas company has inspected and cleared the property.
Can I fix a gas line leak myself?
No. Gas line work in Maryland requires a licensed plumber or gas fitter. Attempting to repair a gas line yourself is illegal and extremely dangerous. Deep Dive Plumbing Maryland is licensed for gas line work — Terry Foster Jr. holds a Maryland Gas Fitter license in addition to his Master Plumber license.
How do I know if my gas line is leaking if I don't smell anything?
Small leaks may not produce a noticeable smell. Signs of a slow leak include unexplained increases in gas bills, dead vegetation in a line pattern in the yard, or a persistent hissing sound. A licensed plumber can perform a gas line pressure test to check for leaks throughout the system.
How much does gas line leak repair cost in Maryland?
Gas line repair costs vary depending on the extent of the damage. Minor repairs cost less than more extensive pipe replacement. Emergency service calls (nights, weekends) may carry additional fees. The cost of not repairing a gas leak is far higher — in property damage, health effects, or worse.
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