Why do I smell rotten eggs in my house?

Author: Montana Jerde  |  Last update: Saturday, November 15, 2025

If your house smells like rotten eggs, this is probably septic gas, unless you have a carton of eggs hiding in your living room. Septic gas has a strong, naturally occurring odor that smells like rotten eggs. The smell is hydrogen sulfide, which comes from sewage and indicates a potential issue with your plumbing.

What should I do if I smell rotten eggs in my house?

The scent resembles rotten eggs or sulfur. If you smell it, you'll quickly know you have a gas leak and should leave your house or building immediately.

What does a rotten egg smell indicate?

1) Rotten Eggs This smell is probably septic gas, unless you have a carton of eggs hiding in your living room. Septic gas has a strong, naturally occurring odor that smells like rotten eggs. The smell is hydrogen sulfide, which comes from sewage and indicates a potential issue with your plumbing.

Why does my house smell like rotten eggs but no gas leak?

If you smell rotten eggs in the home, call the gas company to make sure you don't have a gas leak. If there is no gas leak in the home, you may have a problem with your electrical system. If you smell the rotten egg smell near an outlet, that's probably where it is coming from.

Does rotten egg smell mean carbon monoxide?

Carbon monoxide gas is odorless—it cannot be smelled. Some myths surround ways to detect carbon monoxide, such as identifying the strong scent of rotten eggs. However, never ignore the “rotten egg” smell of natural gas.

Why Does my House, HVAC, Smell Like Rotten Eggs? Conditioned Air Solutions, Huntsville AL

How do you know if a rotten egg smell is gas leak?

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.

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.

How to locate source of bad smell in house?

If odors seem to be emanating from this part of your home, check the following locations:
  1. Trash Cans. Under counter trash cans are a frequent source of odors. ...
  2. Ovens. Baked-on foods in your oven can cause burning or smoking odors when your oven is in use. ...
  3. Cooktops and Hoods. ...
  4. Disposals. ...
  5. Dishwashers. ...
  6. Refrigerators. ...
  7. Cabinets.

Why am I randomly smelling sulfur?

Phantosmia refers to detecting smells that aren't really there. It's a symptom of many common conditions, including allergies, colds and upper respiratory infections. It could also indicate a brain-related condition, including epilepsy, stroke or Alzheimer's disease.

How to detect sewer gas in home?

This can be accomplished with a sewer gas leak detector, or sometimes referred to as simply a gas leak detector. Other methods include calling in a plumber and he will undertake a smoke test to assess where, exactly, the leak may be in the pipes and also undertake a acoustic leak test.

What disease causes rotten egg smell?

Serious liver disease can make breath smell musty or like garlic and rotten eggs. Compounds that are transported through the blood can also be released through your sweat glands. That can make your armpits and skin smell bad. It's normal for stress to cause smelly compounds to be released through your sweat.

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.

What is the cheapest way to remove sulfur from well water?

The Cheapest Solution: Degassing the Water

Simply pour the water into a glass and let it sit for 24 hours. The air will oxidize the sulphur out of the water and then the smell will be gone. Now, obviously, if you want more than a glass or two of water a day, you're going to want a whole-house solution.

Who do I call if I smell rotten eggs in my house?

This is serious, so take three seconds to get over the initial shock and call your utility company or the fire department immediately. The smell could be coming from any number of things including a gas line issue with your stove, your furnace, or your water heater.

How to find where sewer smell is coming from?

Consider everything that ends up in your drains, especially if you use a lot of products and have a lot of family members using your drains. Other causes of sewer gas odors in your home include a dry P-trap, a loose toilet, or a clogged drain. Another cause of sewer gas could be blocked or clogged vent pipes.

Why does my house smell like rotten eggs coming from vents?

A rotten egg smell could suggest a gas leak in your HVAC system. Air conditioners don't function on natural gas, but they share a blower and ductwork with gas-fired furnaces, which could be the true cause for this smell.

Why does my house smell like rotten eggs but not gas?

Dry drain pipes or clogged sewer pipes can both cause a rotten egg smell throughout the home. Whether it's a problem with your sewer and drain lines or an HVAC issue, it's essential to know the causes and remedies of this smell to quickly eliminate it from your home.

Why am I smelling sulfur in the air?

Sulfur dioxide (SO2) is a colorless, reactive air pollutant with a strong odor. This gas can be a threat to human health, animal health, and plant life. The main sources of sulfur dioxide emissions are from fossil fuel combustion and natural volcanic activity.

How to get rotten egg smell out of house?

Using Chlorine

But concentrated chlorination treatment, which involves adding a limited supply of chlorine bleach to your water supply, can actually help get rid of that rotten egg smell. Once the chlorine has been added to your water supply, you simply let your water run until that rotten egg odor dissipates.

Why do I keep smelling a rotten smell in my house?

Common Causes of Bad Odors in a Home

Some common culprits include: Bacteria:Some strains of bacteria give off foul-smelling compounds when breaking down organic matter like food waste. Fungus: Molds and mildew emit volatile organic compounds and are often the cause when a house smells musty.

What does sewer gas smell like?

The smell of sewer gas is often described as a noxious, rotten-egg-like odor. Its sulfuric, foul smell will permeate your entire home if left unaddressed, leading to major health issues down the line. Small amounts of sewer gas usually won't cause any immediate danger—but large amounts certainly will.

What does black mold smell like?

Toxic black mold growth has a more potent and identifiable smell, like the smell of decay, wet soil, or rot. Visually, it may be greenish-black, grayish-black, slimy, or more furry than other forms of mold or mildew.

Does carbon monoxide smell like rotten eggs?

Many people assume the rotten egg smell is carbon monoxide. In actuality, CO has no odor, and the only way you can be sure if it's there is with a carbon monoxide detector.

How to detect carbon monoxide without a detector?

Signs of carbon monoxide:
  1. Stuffy or stale air.
  2. A pilot light keeps going out.
  3. More condensation than usual on your windows.
  4. Soot build up around a fireplace, chimney, or other fuel-burning equipment.
  5. Fuel-burning equipment has a back-draft (flame flares up when a window or door opens and adds air).

What are at least 3 conditions that can cause carbon monoxide poisoning?

Malfunctioning oil, wood, gas, or coal furnaces. Malfunctioning gas clothes dryer. Wood burning fireplace or gas log burner. Gas or fuel-burning appliances in cabins or campers, barbecue grills, pool or spa heaters, or ceiling-mounted heating units.

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