How to Get Rid of Sewer Smell in Basement | 6 Steps Ro Apply Now


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Basements are already well known for being one of the coldest and wettest places in your home. However, the sewer odor in the basement is caused by, well, sewage, which suggests that something has to be done somewhere in the plumbing system. In this guide, I will discuss how to get rid of sewer smell in basement.

Instead of risking the health problems that often accompany these unpleasant odors, such as sinus infections, bronchitis, and headaches, stop intrusive odors by learning how to get rid of sewer odors. These will save you the hassle and unnecessary money of calling in experts.  

How to Get Rid of Sewer Smell in Basement

How to Get Rid of Sewer Smell in Basement

It’s easy to get rid of the smell of sewer in the basement – you probably won’t have to call a professional plumber. Follow these step-by-step instructions, and your home should smell normal again in the blink of an eye.

Locate the odor

The first step in removing odors from the sewer is to find where it is coming from. Start by using your nose and find where the smell is strongest.

Fill the water siphon

Then check the siphon and fill it with fresh water plus a tablespoon of bleach and cooking oil (which helps evaporation)

Clean the cleaning plug

Cleaning plugs are another source of unpleasant odors. Give yourself a cleaning plug and tighten it to make sure it is airtight.

Check the wax ring seal

If your basement has a toilet, the problem could be in the wax ring seal and toilet flange. Make sure it doesn’t leak, or you may need to re-glue.

Inspect broken hoses

Broken hoses can cause water damage – and a strong odor. Look for a broken and cracked drainpipe looking for water buildup and damp spots near floor tiles.

Light a candle

If the smell persists, try lighting a candle and opening the basement window well to increase airflow.

What are the Causes of the Smell of Sewage Gas in the Basement?

How to Get Rid of Sewer Smell in Basement

There are several common causes of sewage odor in your basement – and most have simple solutions to avoid the smell of rotten eggs and unpleasant odors.

The most common source of odor from sewage in the basement is dry drainage. Basement floor drains use a trap that holds a small amount of water to trap odors inside sewer lines. If the trap dries, odors will penetrate the basement and eventually the rest of the house.

Another common cause of basement odor is your drain pump, basement pump, basement toilet, water heater, or vents. Perform a routine maintenance check on each of these pieces of equipment – if the smell of rotten eggs and hydrogen sulfide becomes stronger, you may have discovered a problem.

Sewage gas stinks when it rains.

When it rains, it is not uncommon for sewage gas to leak from the floor drain and cause bad breath in the house. This is caused by a change in air pressure which makes the air heavy and falling – and the smell of sewage rises from the exhaust pipe to take its place!

The unpleasant smell of rotten eggs can also come from your sewer system after heavy rain due to the unpleasant smell of sewage gas being pushed upwards by water gravitating pulling through the pipes!

Rain can also cause the decomposition of organic material in the pipes to release additional odors – as long as you have a U-shaped sewer siphon with a water siphon, you will be able to retain the smell of sewage gas in the pipes. In addition, many home insurance policies require a proper siphon and drain for full coverage!

The smell of sewage during cold weather and winter months

Sewage odors are likely to intensify in cold weather and during the winter months for several reasons. Ice can crack drains and cause sewer odor from plumbing openings and throughout the rest of the house.

Another problem is that small animals settle in the sewer pipe during the winter months – they block the water and cause an unpleasant odor in the house.

Frozen systems add another layer of problems, and all of this can lead to sewage gas entering your basement. In addition, frozen pipes can crack – and clog – which may require a complete replacement of the sewer system – or simply defrost if possible if you don’t want your basement to stink and damage the water.

Tips to Remove the Odor of Sewer Gas

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First, determine the cause of the smell of sewage gas entering your home. Then try the following tips to help you remove them.

  • Check that all plumbing fixtures are properly installed with appropriate P-traps and vents. Also, check your siphons to make sure they hold enough water. Call a professional plumber to ensure proper installation of the device.
  • Fill any drains often used, such as a basement drain or a shower in a guest bathroom, with a gallon of boiling water. This should help in the elimination of odors created by dry traps.

If the odor is coming from the bathroom sink, try pouring a strong cleaner into the overflow opening of the sink to remove debris that causes the odor. Be careful which cleaners you use; you do not want to risk damaging the finish on the sink or drain.

  • Carefully reinstall the wax rings around the toilet bowl, which may have become old or worn, allowing sewage gas to enter.
  • Invite a professional plumber to separate the ventilation pipes inside your home and clean your ventilation openings throughout the roof. This will remove any blockages and ensure that sewage gas can escape from your home.

Have a professional plumber inspect and replace cracked vents or sewer side pipes with new PVC pipes.

Frequently Asked Questions 

How can you get rid of odors from the sewer?

Start by pouring ¼ cup of baking soda into the drain, and then let it stand for about 10 minutes. After that, add a cup of vinegar. Allow the mixture to sparkle and stand for a few minutes, then finish by draining the water and turning the grinder to remove food debris.

Why does my bathroom smell like sewage?

The smell of sewage gases in the bathroom can be caused by: Evaporation of water in the water pipe P-traps broken seal around the toilet bowl in a wax ring or sealing. The roots of the trees have grown or damaged your sewer pipes.

What if my basement stinks of sewage?

Just pour a few gallons of water to re-establish the proper water barrier. You can add a small amount of vinegar to remove residual odors. If you don’t use the basement toilet often, the water in the P-trap can evaporate just like with floor drains. Rinse the toilet several times to solve the problem.

Why does the basement smell like sewage?

The strong smell of sewage coming from your basement is most often caused by a dried floor drain, a bad ejector seal, poorly ventilated appliances or fittings, or even a damaged sewer pipe. Floor Drains – Rarely used floor drains in your basement are usually a source of sewer odor.

How to check sewage gas?

The first step in solving sewer gas problems can be easily accomplished by an odor test called a “smoke” test. This process involves insulating the sewer system by pushing colored smoke through the roof chimney and blocking the exhaust pipe with a test ball.

How to stop sewage gas in your home?

When your plumbing vent becomes clogged, you put yourself and your loved ones at risk. You will probably know that it is clogged if your home is gargling with a sink or an unpleasant odor. If left unchecked, sewage gas can penetrate your home and cause illness or even explosions.

Can sewage gas affect you?

The traps retain enough water to prevent sewage gases from entering the home. The siphon in each device, when properly vented, provides a liquid seal that prevents sewage gases from entering the building. Sewage gases can pass through ventilation vents and escape the system without entering your home through the plumbing.


You’ll be well on your way to recovering the fresh scent in your home and destroying unpleasant scents if you use these simple ways for identifying and eliminating the sewage smell in the basement.

Whatever the cause of the issue, these simple steps will provide you with everything you need to eliminate basement odors and keep your home running properly.

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