How to know if there is a gas leak?

Author: Prof. Shawna Altenwerth V  |  Last update: Friday, July 18, 2025

In addition to having a distinct smell, natural gas leaks are often visual, causing bubbling water, blowing dirt or dead vegetation. You may also see sinkholes or exposed pipe. It's also possible to hear a hissing sound near a natural gas line or meter.

How can you detect a gas leak?

If you smell a sulfur or rotten-egg-like odor, you could have a gas leak. Natural gas is naturally colorless and odorless. We add an odorant called mercaptan to natural gas, which gives it a distinctive smell. In some cases, you can also identify natural gas by sight or sound.

What are the symptoms of a slight gas leak?

Symptoms from a natural gas leak may include:
  • headaches, sometimes severe.
  • dizziness.
  • fatigue.
  • nausea.
  • irregular breathing.
  • chest pains.
  • memory problems.
  • blurred vision.

Can you stay in a house with a gas leak?

Legally yes, if there is a gas leak that is a danger to your health and safety and if the gas had to be shut off so you have no heat or hot water, that would make the property uninhabitable as a matter of law.

How do I know if there is a gas leak in my area?

External gas leaks can be from underground pipes that are used to transport gas to buildings. If you're outside a property and can smell gas, then it's likely that there's a leak and you should contact the National Gas Emergency Service number.

How to detect a gas leak

How long can a gas leak go unnoticed?

Gas leaks are subtle in smell but very obvious in bills. They can even go on for months undetected.

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 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 there a device that can detect gas leaks?

The gas leak alarm sensor is like a superhero that can detect butane, methane, and any odd smells lurking around. And the best part? It talks! It's got voice prompt, so it can be like, "Hey, watch out!

What does a gas leak sound like?

Here are some signs of a natural gas leak:

A hissing or whistling noise. Fire coming out of a hole or on top of the ground. Dirt blowing from a hole in the ground.

How serious is a minor gas leak?

For mild leaks, turn pilot lights off, open your windows, and contact your gas company. They'll tell you what to do and whether the gas meter needs to be turned off. If you're noticing symptoms or a strong odor, leave your home immediately. Remember that gas is volatile and can cause an explosion.

What are two warning signs of carbon monoxide poisoning?

The most common symptoms of CO poisoning are headache, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion. CO symptoms are often described as “flu-like.” If you breathe in a lot of CO, it can make you pass out or kill you.

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 long to air out a house after a gas leak?

After your gas leak is fixed, your house might still have a strong gas smell. Now you can open your windows and doors to let your home air out. You want to air out your house for anywhere between 15 minutes and a few hours. Do not assume that all the gas has dissipated once the smell disappears.

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.

How do you suspect a gas leak?

Open your windows for better ventilation. Check that stove burners, naked flames, and pilot lights are off. Finally, turn off your electricity at the fuse box. From outside the house, call your local licensed plumber or gas fitter.

How much is gas leak detection?

At 1300 FINDLEAK, our gas and water leak detection cost Australia wide starts from $168 including GST. Prices may vary depending on your location, and whether it is a domestic or commercial job.

Can you stay in a home with a gas leak?

We want to ensure that any potential gas leak is handled safely and swiftly. 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.

Can a small gas leak make you ill?

Can a gas leak make you ill? Sometimes, a gas leak can cause headaches, dizziness and nausea. If you have mild symptoms they should go away when you leave the home, but it's still a good idea to see a doctor. Breathing in carbon monoxide, meanwhile, can lead to poisoning, which can be fatal.

How common are home gas leaks?

With nearly 70 million American households with natural gas lines in their homes, there is an increased need for awareness regarding gas leak safety. The National Fire Protection Association (NFPA) reports that fire departments respond to around 125,000 residential gas leaks annually.

What to do after gas leak exposure?

Go to a phone that is not near the smell and call your local gas company right away. (If the smell is strong or you are unsure, leave the building and then call.) They will come and make the area safe at no charge to you.

How to tell if a stove is leaking gas?

What To Look For
  1. The gas flames on your stove are yellow, not blue.
  2. You can smell gas near your stove, even if it's turned off.
  3. If you touch the oven door, it's hot to the touch.
  4. You can hear a hissing noise near your stove.

Is there an alarm for gas leaks?

If levels of natural gas indicate a potential leak, the natural gas detector will beep loudly and sound the following audible alarm: “Danger. Gas leak explosion risk.

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