Gas Leak Warning Signs: What to Do If You Smell Gas Indoors

The most reliable sign of a natural gas leak is the smell of rotten eggs or sulfur indoors, gas companies add mercaptan (a sulfur compound) specifically so leaks are detectable. Additional warning signs include: a hissing or whistling sound near gas lines or appliances, dead or dying vegetation in an otherwise healthy area of your yard (indicating an underground gas line leak), bubbling in standing water near your gas meter, and unexplained physical symptoms like dizziness, nausea, or headaches that clear up when you leave the home. If you suspect a gas leak, leave immediately, do not operate any switches, appliances, or your phone inside the building.

If you smell gas indoors: (1) Do not turn any switches on or off, electrical sparks can ignite gas. (2) Do not use your phone inside the building. (3) Leave the door open as you exit to allow ventilation. (4) Get everyone out of the building, including pets. (5) Once outside and at a safe distance, call 911 and your gas utility (Florida City Gas, Peoples Gas, or FPL for propane). (6) Do not re-enter until emergency services have inspected the property and declared it safe. After the emergency is resolved, call a licensed gas line plumber to inspect and repair the leak source.

Natural gas in its raw form is odorless. Gas utility companies add mercaptan, a sulfur-based odorant, to make leaks detectable. The smell is commonly described as rotten eggs, sulfur, or a skunk-like odor. It is intentionally distinctive and unpleasant so that even small gas concentrations are noticeable. Propane gas has a similar added odor but is heavier than air, meaning it accumulates near the floor rather than rising to ceiling level like natural gas.

Yes. Natural gas (primarily methane) displaces oxygen in enclosed spaces. Symptoms of gas exposure include dizziness, lightheadedness, nausea, headaches, fatigue, and in severe cases, loss of consciousness. These symptoms typically improve when you move outside to fresh air, which can itself be a warning sign. Carbon monoxide (CO) from incomplete gas combustion in appliances is even more dangerous, as it is colorless and odorless. Every South Florida home with gas appliances should have both a natural gas detector and a carbon monoxide detector installed.

The safest at-home check is a soapy water test on accessible gas line fittings: apply a solution of dish soap and water to connection points, valves, and flexible gas connectors. Bubbles indicate escaping gas. However, this test only works on visible fittings, it cannot detect leaks in buried lines, behind walls, or inside appliances. Natural gas detectors ($25–$80 at hardware stores) provide continuous monitoring and are recommended for all homes with gas appliances. For any suspected leak inside the building, evacuate first and call 911 before attempting any inspection.

Gas line repair in South Florida typically costs $150–$400 for a single fitting repair or flexible connector replacement. Larger repairs, such as replacing a corroded segment of black iron pipe or repairing a buried supply line, range from $400–$1,500 depending on access and pipe length. All gas line work in Florida requires a licensed plumber or gas contractor and a permit. Royal Elite Plumbing provides written estimates before any gas line work begins. Call (561) 336-0535 for a same-day assessment in Palm Beach and Broward County.

The most common sources of gas leaks in South Florida include: deteriorated flexible gas connectors on appliances (these have a 10–20 year lifespan), corroded black iron pipe fittings in older homes (especially pre-1990 construction), improper appliance installation or DIY connections, earthquake or ground movement disrupting buried gas lines, and damage during home renovation or landscaping that strikes underground gas supply lines. South Florida's sandy soil and underground utility density make accidental line strikes during excavation a significant local risk.

No. There is no safe threshold for remaining in a building with an active gas leak. Even small gas concentrations can reach explosive levels in an enclosed space, the lower explosive limit (LEL) for natural gas is just 5% concentration in air. Gas accumulates in low-lying areas, inside cabinets, and near appliances. Additionally, even non-explosive gas concentrations displace oxygen and can cause health symptoms. Leave the building and call 911 regardless of how minor the smell appears.