Plumbing guide · Kyle, TX
Signs of a Gas Leak in Your House and What to Do
The signs of a gas leak in your house include a rotten-egg smell, hissing and dizziness. If you notice any of them, leave first and call from outside.
Emergency? Call now, 24/7(737) 717-0737- Leave the buildingTake people and pets with you.
- Call from outside911 or the gas utility.
- Wait for the all-clearThen call a plumber to repair.
The signs of a gas leak in your house, in one list
- A rotten-egg or sulfur smellThe most common sign, from the odor added to gas.
- Hissing or whistlingNear a pipe, meter or appliance.
- Dead plants or bubbles outsideClues to an underground leak.
- Headache, dizziness, nauseaSymptoms that ease outdoors.
- Do not investigateLeave first. Call 911 or the gas utility from outside.
If you smell gas right now, do this before reading further
The signs of a gas leak in your house matter, but your first move does not depend on diagnosing anything.
Leave, then call from outside
Walk out of the house. Take people and pets with you, and leave the door open behind you if you can do that without delay. Do not stop to open windows, find a valve, search for the source or finish what you were doing.
Once you are well away from the building, call 911 or your gas utility’s emergency number, which is printed on your gas bill. Say that you smell gas, give the address and wait outside. Do not go back in until the utility or the fire department says it is safe. Then a plumber can find and repair the fault, which is the work described on our gas leak repair page.
Do not do these things inside
Do not turn lights or switches on or off, plug in or unplug anything, use a lighter or match, start a car in an attached garage, or ring a doorbell on your way out. Any spark can ignite gas that has built up in a room.
Why there is no home-fix section here
This guide does not offer steps for finding or sealing a gas leak, because that is not safe work for a homeowner. Soap-bubble tests, tightening fittings and relighting pilots are for trained hands with the right instruments. The right action is to leave and let the utility and a plumber handle the repair.
- Leave the buildingEveryone, including pets.
- Call from outside911 or the gas utility.
- Stay outUntil cleared by the responders.
- Then call a plumberFor the repair after the all-clear.
Signs of a gas leak in your house you can smell
Smell is the sign most people notice first, and utilities add it on purpose.
The rotten-egg odor
Natural gas has no scent of its own. Suppliers add a sulfur compound so a leak is noticeable, and most people describe it as rotten eggs, sulfur or a burned-match smell. Propane has the same added odor. A faint whiff near a stove right after you light a burner can be a small puff of unburned gas, but a smell that lingers or grows stronger is a leak until proven otherwise.
Some people cannot smell the additive well. A cold, a sinus problem, age or certain medications can dull the sense. Do not rely on your own nose alone; a gas detector plugged in near the floor or ceiling, as the maker directs, adds a second warning. Natural gas rises, so the detector goes higher, while propane sinks, so its detector goes low.
| Smell | Likely source | Action |
|---|---|---|
| Strong sulfur odor indoors | Leak at an appliance or pipe | Leave and call from outside |
| Brief whiff when a burner lights | Small puff on ignition | Watch it; if it repeats, call |
| Odor only near the water heater | Pilot, burner or connector | Leave and call from outside |
| Odor in the yard by the meter | Leak at the meter or line | Move away and call |
| Sewer-like smell, not sulfur | Dry drain trap or sewer vent | Not gas; a plumber can check |
Smells that are not gas
A dry floor drain, a seldom-used guest bath or a failing wax ring can send sewer gas into a room. It smells similar to some people. Sewer gas is not the same as fuel gas, but it has its own hazards. If you cannot tell the two apart, treat it as fuel gas first and ask for help from outside.
- Fuel gasSulfur, rotten eggs, strongest near gas appliances.
- Sewer gasStale, musty, strongest near drains.
- ElectricalHot plastic or fishy burning smell.
- When unsureLeave and call.
Sounds, sights and appliance clues
Some leaks give you more than an odor. These signs can show up even when you cannot smell a thing.
What you can hear and see
A hiss or a whistle near a pipe, a meter or an appliance connection suggests gas escaping under pressure. Near a gas line outdoors, bubbling in standing water or mud, dirt that seems to blow from a spot, or a patch of dead grass and plants over the line can all point to a leak underground.
Inside, a gas flame that burns yellow or orange instead of a steady blue, soot staining around a furnace or a heater, or a pilot that keeps going out are clues of poor combustion. They are not always leaks, but they call for a plumber or an HVAC technician before you keep using the appliance. A water heater in a garage or attic is a common place for these problems, so our page on water heater repair covers gas models.
| What you notice | Where | What it may mean |
|---|---|---|
| Hissing or whistling | Pipe, meter, appliance hookup | Gas escaping under pressure |
| Bubbles in wet ground | Over a buried line | Underground leak |
| Dead patch in a green lawn | Along the gas line path | Gas killing roots |
| Yellow or orange flame | Stove, furnace, heater | Poor combustion; needs service |
| Pilot keeps going out | Heater or furnace | Draft, thermocouple or supply trouble |
A gas bill that makes no sense
A bill that climbs without a change in weather, new appliances or more people at home can hide a slow leak. Compare the same month across years, and check the meter dial with every appliance off. If it keeps moving, call the utility rather than testing it yourself.
| Clue | Check |
|---|---|
| Higher bill, same use | Compare past months |
| Meter dial moves, appliances off | Call the gas utility |
| New smell after appliance work | Leave and call |
| Hissing after a dig or yard work | Move away and call |
How a gas leak can make people and animals feel
Symptoms are not a test, but several together should send you outside.
What the body notices
Breathing a lot of natural gas displaces oxygen, and people may get headaches, dizziness, nausea, fatigue, ringing in the ears or trouble breathing. Pets can act sluggish or uneasy. Symptoms that fade when you step into fresh air and return when you go back inside are a strong hint.
Carbon monoxide is a separate hazard. It is produced by gas appliances that burn poorly, it has no smell, and it causes similar headaches and drowsiness. A battery-powered or plug-in carbon monoxide alarm on each floor is the safeguard. If it sounds, leave and call 911 the same way you would for a gas smell.
- Headache and dizzinessCommon to both gas and CO exposure.
- Nausea or tirednessWorse indoors, better outdoors.
- Sluggish petsThey may react before you do.
- Alarm soundingTreat it as real; leave.
What to say on the phone
When you call, say you smell gas, give the address and mention anything you noticed, such as a hiss from the water heater or a smell that began after appliance work. Ask whether anyone has symptoms. Stay on the line until the responder tells you to hang up.
| Tell them | Why |
|---|---|
| Your exact address | So crews know where to go |
| Where the smell is strongest | Points them to the source |
| Anyone feeling unwell | Medical help may be needed |
| What you did before smelling it | Hints at the cause |
Gas signs in the yard and at the meter
A buried line can fail without any sign inside, and the yard is where it shows.
Lines, meters and yard work
Gas lines are buried from the meter to the house, and many homes also have lines to a pool heater, a grill, a generator or an outdoor kitchen. Soil movement, a dig, a nail through a line or years of corrosion can open a leak. Clay soils that swell and shrink can also strain buried lines over time, though it varies by property.
Stay away from a meter or line that smells, hisses or looks damaged, and call the gas utility from a distance. Call before you dig, too, so the buried lines are marked. When you know a line is faulty, a plumber handles the repair under a gas line repair visit.
| Where | Look for | What to do |
|---|---|---|
| Meter and regulator | Hiss, smell, damage | Step back and call the utility |
| Yard over the line | Dead grass, bubbles after rain | Keep clear and call |
| Outdoor appliance hookup | Smell near grill or heater | Shut the appliance, leave the area, call |
| Garage or attic heater | Smell at the gas connector | Leave and call |
Appliances that burn gas
Stoves, ovens, dryers, furnaces and water heaters all connect to the gas line through flexible connectors or rigid pipe. Old connectors can crack and fittings can loosen after a move or a repair. If an appliance was recently installed or moved and you now notice a smell, say so on the call. A tankless water heater and its venting are among the pieces that need correct gas supply and combustion air.
- Stove and ovenBurner will not light cleanly.
- DryerSmell near the back connector.
- FurnaceOdor when it starts.
- Water heaterPilot out, smell at the base.
After you leave: the all-clear and the repair
A gas call goes in a sequence. Knowing the order helps you plan.
Responders, then repair
The utility or fire department tests the air, checks the meter and may shut off the supply. They will tell you when it is safe to go back in. If they find the fault on your side of the meter, the repair is the property owner’s job, and a plumber who works on gas lines does it.
The plumber finds the leak with proper instruments, makes the repair or replaces the damaged section, and then pressure-tests the line. The utility restores service, and appliances get relit by someone qualified. If the leak followed a burst or ruptured water line in the same trench, emergency plumber help covers both.
Leave and call
From outside, 911 or the utility.
Responders test
They clear the house or cut supply.
Plumber repairs
Locate, fix and pressure-test.
Service is restored
Appliances relit by a qualified person.
Preventing the next scare
Have gas appliances serviced on a schedule, replace old flexible connectors, keep storage away from the heater and furnace, and test your carbon monoxide alarms each season. Know where your meter is and keep the area clear. Teach everyone in the home the plan: leave, call from outside.
If the cause was an aging appliance, the choice may be repair or replacement, which our guide on water heater repair vs replacement helps weigh. For home-safety basics, read how to shut off your main water valve for the water side of an emergency.
- Service appliances on a scheduleCombustion and connectors.
- Test CO alarmsAt least once a season.
- Clear the meter areaKeep it visible.
- Rehearse the planLeave, then call from outside.
When to call a plumber after a gas scare
The utility and responders come first. A plumber comes in once the area is safe.
Responders found the leak on your side
Your lines and fittings are the owner’s to repair.
An appliance smells or flames look wrong
Stop using it and book service.
A new appliance or a move changed the hookup
A check confirms every connection is tight.
You want a line or connector replaced
Old pipe and flex connectors can be renewed.
Gas services on this site
Gas leak repair
Find and fix the leak after the all-clear.
Gas leak repair details →Gas line repair
Repair or replace damaged gas piping.
Gas line repair details →Emergency plumber
Urgent help for dangerous plumbing faults.
Emergency plumber details →Water heater repair
Service for gas-fired tank heaters.
Water heater repair details →Questions about the signs of a gas leak
What are the most common signs of a gas leak in your house?
The most common signs of a gas leak in your house are a rotten-egg or sulfur smell, a hissing sound near a gas line or appliance, a flame that burns yellow instead of blue, and headaches or dizziness that ease when you go outside. Any one of these is reason to leave and call from outside.
Should I open windows if I smell gas?
No. Take the time to leave instead. Opening windows can waste seconds you do not need to spend, and anything that makes you linger raises the risk. Go outside, move away from the building, then call 911 or the gas utility from there.
Can I use my cell phone inside the house if I smell gas?
It is safer to walk out first and make the call outdoors. A phone is an unlikely spark source, but the standard guidance is to leave before doing anything else, and that removes any doubt.
Can I find the leak myself with soapy water?
This guide does not recommend it. The bubble test is a method used by trained people who also know how to shut off supply and handle what they find. A homeowner searching for a leak may linger in a bad atmosphere. Leave and call.
What does the gas utility do when I call?
They send a crew to test the air and the meter. If gas is present, they can shut off the supply and tell you when it is safe to return. If the fault is on the house side of the meter, a plumber repairs it before service resumes.
Is a gas smell the same as a carbon monoxide problem?
No. A gas leak has an added smell, while carbon monoxide has none. Poorly burning appliances make carbon monoxide, which is why alarms matter. Both are reasons to leave the house and call from outside.
What should I do right now if the smell is faint?
Treat a faint but persistent smell as real. Leave and call from outside. A faint odor can be the edge of a larger accumulation, and cold or illness can dull your nose. The utility would rather be called for nothing than miss an actual leak.
Who repairs a gas leak, the utility or a plumber?
The utility handles the meter and its service line. The pipe, fittings and appliance connections inside and around the house belong to the owner, so a plumber does that repair. Our gas leak repair page describes how the visit goes.
Can I get a same-day plumber after a gas leak is cleared?
Same-day service is available, and someone answers 24/7. Once responders have declared the house safe and told you where the fault is, call and describe it. The plumber can then plan the repair and pressure test.
What affects the cost of repairing a gas leak?
The location of the leak, how much pipe is damaged, whether the line is buried, and the type of piping. A loose connector is a small job, and a corroded buried line is a larger one. Ask about pricing when you call.
More guides for urgent plumbing problems
Gas cleared and need the repair done?
Once responders say the house is safe, call. Open 24/7, with same-day service available.