Why do I randomly smell gas in my house?

Author: Mr. Barney Bergnaum  |  Last update: Saturday, April 4, 2026

It's normal for a faint odor to remain after lighting a stove or if the pilot light in a hot water heater, gas fireplace or other appliance goes out. Nonetheless, any possible leak must be taken seriously, especially if the odor is strong, persistent, or accompanied by a hissing sound.

Why do I occasionally smell gas in my house?

Sometimes, gas is released from your furnace every time you start it. The odor is usually faint and should dissipate within a short time when you open the windows. If the odor seems to be spread across your house and does not go away, it is probably a leak. A leak could pose fire and pollution hazards in your home.

Why can I smell gas when there is none?

It is a result of decomposition in wet environments and waste products. If the gas company comes out and confirms there are no leaks anywhere but you still smell it, there's a chance it is coming from a toilet water trap or perhaps a dried out drain pipe somewhere in the building as well.

What could be mistaken for gas smell?

Strong smells in the area, like cooking or chemical odors, can mask the smell of natural gas.

How to detect a gas leak?

Think you smell natural gas?
  1. Listen. For a hissing, blowing, whistling or roaring sound.
  2. Smell. A distinct odor like rotten eggs or sulfur.
  3. Look. For blowing dirt, bubbling water or dead vegetation.

SMELL SEWER GAS don’t call a plumber (EASY FIX)

What are the symptoms of a gas leak in a house?

5 Natural Gas Safety Tips: Signs, Symptoms and What to Do When a Gas Leak Occurs
  • The smell of rotten eggs. In its natural state, natural gas is odorless and colorless. ...
  • Hissing sounds. ...
  • Air bubbles outside your home. ...
  • Dead or dying plants. ...
  • Higher-than-normal gas usage.

Will a carbon monoxide detector detect a gas leak?

No, carbon monoxide (CO) alarms cannot detect natural gas leaks. They are designed to detect the presence of carbon monoxide, a poisonous gas formed during incomplete combustion of fuels like oil, gas, propane, and wood.

Would a gas leak smell come and go?

Natural gas leaks are particularly likely to cause smells in small, enclosed areas where gas can build up. If the leak is outside, the smell may seem to come and go as the breeze blows it away. The other big sign to look out for is a strange noise.

What does it mean when you smell gas that isn't there?

Phantosmia may be caused by a head injury or upper respiratory infection. It also can be caused by aging, trauma, temporal lobe seizures, inflamed sinuses, brain tumors, certain medicines and Parkinson's disease. Phantosmia also can result from a COVID-19 infection.

How long does it take for a gas leak to harm you?

Severe leaks can cause this problem in just five minutes. The EPA states that exposure to concentrations of nine ppm or more for eight hours is enough to produce harmful health effects for at-risk individuals. Exit the property and call 911 if you suspect your home has a gas leak.

Is smelling gas a symptom of something?

Foul-smelling gas can occur for many reasons, but sometimes it can indicate serious issues. Talk to your doctor if you have consistently foul-smelling gas accompanied by the following symptoms: Bloody and inconsistent stool (poop) Change in frequency of bowel movements.

When I open my legs, it smells like urine.?

Protein breaks down into amino acids, which the body converts into ammonia. The body then releases this ammonia through urine and sweat, which may produce an odor. Dehydration can also make the sweat smell like ammonia. This is because the body needs water to get rid of ammonia through sweat.

Can anxiety cause phantom smells?

Anxiety can cause a wide variety of symptoms, including phantom smells (phantosmia or olfactory hallucinations). Many people with anxiety report smelling odd smells that other people do not smell.

What if I smell gas but no leak?

If your home smells like gas, but there's no apparent leak, here are steps you should follow: Ventilate the house by opening all windows and turning on ceiling fans. After this, if the smell is persistent, evacuate your home. Put out any materials that can create a flame or cause a spark, such as any open flames.

Why do I keep smelling gas in my nose?

Phantosmia is a condition that causes you to detect smells that aren't actually in your environment. It can happen in one nostril or both — and the odors may be foul or pleasant. Common causes include colds, allergies, nasal polyps and dental issues.

What does a furnace leak smell like?

If you detect a sulfuric, rotten egg-like smell coming from your furnace, it is imperative that you act immediately, as you could be dealing with a gas leak.

What smell can be mistaken for gas?

Hydrogen Sulfide

The gas has a strong scent of rotten eggs, which makes it distinct from other, similar gases. If you detect this rotten egg scent and you are using hydrogen sulfide at your facility, this could be evidence of a leak.

Why am I smelling gasoline in my house?

It's normal for a faint odor to remain after lighting a stove or if the pilot light in a hot water heater, gas fireplace or other appliance goes out. Nonetheless, any possible leak must be taken seriously, especially if the odor is strong, persistent, or accompanied by a hissing sound.

What hormone imbalance causes phantom smells?

While aging is a common cause, phantom smells can be a sign of underlying medical conditions or endocrine disorders such as hypothyroidism. Hypothyroidism is a deficiency of thyroid hormones - thyroxine (T4) and triiodothyronine (T3).

Is it safe to stay in a house that smells like gas?

Here's what you should DO if you smell gas: DO leave the home, building, or area of the suspected leak. Get to a safe area as quickly as possible. After leaving your home, DO call the 24-hour emergency number for Peoples at 1-800-400-4271, or call your local emergency response number.

Is it normal to smell a little natural gas?

Natural gas has no odor. Gas companies add a harmless chemical called mercaptan to give it its distinctive “rotten egg” smell. All natural gas and propane pipeline gas in Connecticut is odorized. If you smell gas near an appliance, it may be just a pilot light that has gone out or a burner valve that is open slightly.

How long can a small gas leak go unnoticed?

They can even go on for months undetected. But if there's a significant amount of gas escaping from your system, it can cause a spike in your gas bill.

What to do if I smell gas?

If you smell gas:
  1. If indoors, leave your home/building immediately! ...
  2. If outdoors, move away from the area.
  3. Call 9-1-1 and your natural gas utility (if you know the number) from a safe distance, away from the odor.
  4. Gas Company service personnel will be dispatched immediately.

How to test for gas in a house?

How to check for a gas leak
  1. Listen for a hiss or whistling noise. Stop moving for a minute and focus on what you can hear. ...
  2. Check the gas stove or gas range top. When you turn on the burner, gas stoves will give off a blue flame. ...
  3. Try the soapy water test. ...
  4. Use a natural gas leak detector.

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