Why does my house smell like gas but no leak?

Author: Johathan Connelly  |  Last update: Wednesday, June 3, 2026

If there is a gas smell but no leaks, it could be the lingering propane odor due to poor ventilation or it coming from your neighbor. The dirty sewage system, contaminated well, or rotten garbage (like veggies, dead animals, residual foods, etc.) might also be the source of the smell.

Why would I smell gas if there is no leak?

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. If you find this problem and can fix it, the problem may be solved. If you smell gas inside: Go to a phone that is not near the smell and call your local gas company right away.

Is it normal to have a slight gas smell in a house?

There is no cause for concern. A faint smell of gas anywhere is not a cause for concern. But if it persists inside the house call the gas company to check it out. It takes fairly high concentrations (strong gas odor) of gas in the air for anything bad to happen.

What smell can be mistaken for gas in your house?

Mercaptan gives off a strong sulphur-like smell which can be mistaken for the smell of rotten eggs. It's often this smell that is the early warning of any sort of gas leak and you should take the appropriate measures to ensure the safety of yourself and others around you.

Is it sewer gas or natural gas?

Is It Sewer Gas? The first thing to do is make sure the smell is sewer gas—usually a rotten egg smell—and not a natural gas smell, which usually smells like a skunk. If you think it's a natural gas smell (skunk!), call you're natural gas company immediately. If they can't be reached, call the local fire department.

How to Find Sewer Smell in Your House with a SMOKE TEST! Twin Plumbing

How to tell the difference between a gas leak and sewer smell?

The first thing is to make sure the smell is sewer gas which is usually a rotten egg smell and not a natural gas smell which usually smells like a skunk.

Is it unhealthy to breathe sewer gas?

In extremely high concentrations, hydrogen sulfide can cause loss of consciousness and death. Suffocation: High concentrations of methane in enclosed areas decrease the amount of oxygen in the air and can cause suffocation. Symptoms of a lack of oxygen include: Dizziness.

How do you know where a gas smell is coming from?

An odor of rotten eggs near an appliance is likely associated with natural gas. Look around the walls for stains; if you notice any discoloration, it could signify a gas leak. You can feel the area for any puffiness, which may indicate excessive heat, which is another indication of a gas leak.

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.

How long does it take to clear gas out of a house?

Gas leaks can be cleared out of the home in as little as a few minutes. The severity and source of the leak can determine how long it will take for the toxic fumes to exit your home. If you have a gas leak you must identify the source and repair the leak.

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.

Who to call for sewer gas smell?

Sewer gas produces a very distinct rotten egg smell, caused when organic materials break down and decompose to form hydrogen sulfide. If you're unsure about the smell coming from your drains or sewers, call a licensed plumber who can perform an inspection or clear and clean blockages.

Is it bad to smell a little bit of gas?

Many adverse health effects of gasoline are due to individual chemicals in gasoline, mainly BTEX, that are present in small amounts. Breathing small amounts of gasoline vapors can lead to nose and throat irritation, headaches, dizziness, nausea, vomiting, confusion and breathing difficulties.

Why do I randomly smell gas in my house?

The presence of a gas odor can indicate a potentially dangerous gas leak, which should be taken seriously. If you suspect a gas leak, immediately evacuate your home, call the gas company or emergency services, and do not attempt to fix the issue yourself.

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.

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.

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 does a plumber find a gas leak?

We locate gas leaks by inducing helium into the gas lines and using a sensitive helium “sniffer” to identify where walls may need to be opened if the leak is not found at any exposed section of pipe. Sometimes we can get hits via gaps in the walls around outlets and switches or coming up through the floor upstairs.

What could be mistaken for gas smell?

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

Does smelling gas always mean a leak?

In some instances, the smell of gas may be present naturally. However, leaks can occur, and we want to make sure they are resolved as quickly as possible. Natural gas is odorless, but an additive called mercaptan is included to alert people of leaks.

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.

How to tell if sewer gas is in a house?

But if there is a sewer smell in the house, similar to that of rotten eggs or cabbage, you may have a sewer gas leak. Gasses off-put by the sewer are a byproduct of the breakdown of waste. But the pungent smell they create is not just disgusting – these gasses can be dangerous as well.

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

Answer: Only under extremely unusual circumstances. Although hydrogen sulfide is a toxic gas, it will not harm people at the concentrations that exist in a house with sewer gas odor problems. Studies have shown that hydrogen sulfide has a depressant effect on the central nervous system in concentrations above 150 ppm.

Can sewer gas come up through the toilet?

Yes, sewer gas can come up through the toilet if there is a problem with the plumbing system.

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