Will sewer smell go away on its own?

Author: Isidro Wilkinson  |  Last update: Sunday, January 4, 2026

Bad odors emanating from the bathroom may not have that element of surprise, but even so, it's a good idea to run down the source. When that smell reeks of the sewer, it may not go away on its own but instead, point to a serious problem that might require professional plumbing repair.

How long does it take for sewer gas to dissipate?

If the sewer gas odor was caused by a dry P-trap, the smell should dissipate almost immediately. If you have any plumbing fixtures you rarely use, you can also easily prevent them from smelling like sewer gas by making sure to put some water down the drain every week or two.

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

Yes, the smell from a backup sewer in the basement can potentially harm you in several ways: Health Risks from Sewage Exposure: Sewage contains harmful bacteria, viruses, and parasites that can cause infections or gastrointestinal illnesses. Prolonged exposure to sewage can increase the risk of health problems.

Does running water help with sewer smell?

You need to run the water occasionally to keep the drain trap full. Basically that little dip in the drain is used to block the smells of the sewer but if you don't use the sink or shower regularly that water evaporates and smells get through.

How do I get my house to stop smelling like sewer?

Clear away debris, leaves, or bird nests that might be blocking the vent. Ensure the vent stack is working correctly to allow sewer gases to escape. Inspect and Replace Wax Ring: If you suspect that the sewer smell is coming form around your toilet, you may need to inspect and repalce the wax ring seal.

What to Do If You Smell Sewer Gas

How do I find out where the 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 drain smell like sewage but no blockage?

Mould Formation – Mould or mildew forms inside the pipes when there is a leak and water remains standing for a while. The mould can generate a stinking odour that you can smell even from behind a wall. Plumbing Issues – Sewer smell can also be caused due to incorrect plumbing fixtures.

What absorbs sewer smells?

Charcoal-based odor absorbers or baking soda can be placed near the source of the odor or in the affected rooms to absorb and neutralize the smell.

Will caulking a toilet stop sewer smell?

In addition, urine and water can get under your toilet and cause further damage. Apply caulking to form a protective coating around your toilet base and combat bad odors.

Is there a valve to stop sewer smell?

The STINK-SHIELD® Vertical is an anti-smell valve designed to stop bad smells coming from surface water drains. It is placed into the manholes of surface water drain, on new or existing networks, on all types of pipeline and drain configuration. It is installed without the need for tools.

Can you stay in a house with sewer back up?

Quickly handling sewage backups is important for everyone's safety. If left untreated, it can cause more health problems and damage to the house. It's not something you should ignore. Living in a house with sewage backup is very risky.

Is it bad to breathe in sewer smell?

Yes, sewer gas is noxious, and in high concentrations, it can be toxic or lead to a loss of consciousness. For brief exposure to sewer gas, any resulting health symptoms will usually resolve themselves without medical intervention.

Who to call for sewer smell in house?

Causes of Sewer Gas Smell

Sewer gas smells could also be coming from your pipes if they weren't installed properly or are damaged. A local plumbing professional can assess the problem and provide solutions, but here are some more common causes of septic odors in your home: Ice buildup on plumbing pipes.

Where is the sewer vent located?

But there's another part of your plumbing system that can become blocked: your sewer vents. Located on the roof, these vent pipes allow gases to escape from your sewer system. They regulate the air pressure in your system, allowing waste to flow freely.

Why does sewer gas smell come and go?

Due to the frequent movement of water and waste through your plumbing system, and the varying use of different drains throughout the day, some issues can fluctuate. This means that you may only notice the symptoms of a problem, like a sewage smell, at certain times of the day or in response to certain action.

What happens if you don't caulk your toilet?

Caulk prevents smell

Yes, the bathroom is a place to get clean, but it can easily be a place to trap some pretty foul smells. If you don't caulk a toilet to the floor, you could find yourself smelling leftover residue from smelly mop water, tub water, or even worse, the remnants of your son's potty training.

Why does my toilet smell like sewer but no leak?

A sewer gas smell in the bathroom can be caused by:

evaporation of water in the P-trap piping. broken seal around the toilet in the wax ring or the caulk. A burst pipe. tree's roots have grown into or have caused damage to your sewer pipes.

Does bleach stop sewer smell?

Bleach is highly effective in killing bacteria and other microbes causing the foul smell. However, it should be used sparingly to avoid damage to your plumbing system.

What does a sewer vent look like?

It will look like a vertical pipe running through the roof. The vent pipe works hand in hand with the drainage pipes. When the drainage pipes carry waste out of your home, the vent pipes supply fresh air to the plumbing fixtures, so they can repeat the process and continue moving waste out of your home.

Why does my house suddenly have a strong sewer smell?

These are the most common causes of sewer line clogs, broken or damaged sewer lines, and foul sewer odors in homes: Clogged drains and blockages. Blockages or backups from the city's sewer system. Tree roots that have intruded into the sewer line.

What are the symptoms of sewer gas poisoning?

Irritated eyes, nose, throat, and respiratory system, including tearing of eyes, cough, or shortness of breath. Effects may be delayed. Severe eye and respiratory irritation such as coughing and difficulty breathing. These symptoms may be accompanied by headache, dizziness, nausea, vomiting, and more.

How do I know if my sewer drain is clogged?

10 Signs Your Sewer Line Is Clogged
  1. Multiple Fixtures Are Clogged. ...
  2. Flushing the Toilet Causes Water to Come Up Elsewhere. ...
  3. Water Draining From Your Washing Machine Causes an Overflow in Other Locations. ...
  4. Drainage at the Cleanout. ...
  5. Slow-Draining Sinks or Toilets. ...
  6. Frequent Plunging. ...
  7. Bubbles in Your Toilet Water. ...
  8. Dark Water.

Why is poop coming out of my shower drain?

A clogged sewer line is easily the most common reason for sewage coming out of your shower drain. All of the sinks, tubs, and toilets in your home are connected to a single drain pipe. This pipe leads to the main sewer line beneath your home, which carries all sewage and wastewater to your local sewer system.

Is there a sewer gas detector?

A Sewer Gas Detector is a electronic handheld device that has a gooseneck with a sensor. The sensor detectors sewer gas coming from your drain in your shower, bathroom or kitchen.

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