Why Does My Bathroom Smell Like Sewer When It Rains?


Raining often causes atmospheric pressure changes, which can lead to the air becoming heavy. As such, the methane gases typically found in the septic tank don’t flow through the vent as they normally would. … A blocked venting system in the septic tank is another possible cause of a sewer smell in your house.


If your house smells like sewer when it rains, another possible culprit may be a dried-out water barrier in the sewer trap, which is usually caused by a lack of use. If you have a fixture in your home that isn’t used very often, such as a bathroom shower in the basement, then the water barrier inside the sewer trap can dry out.

Sewer Odor in the ENTIRE HOUSE! You WON’T Believe where it was coming from…Twin Plumbing

Frequently Asked Questions

Why does my house smell when it rains?

Hear this out loudPauseOften, when it rains, the atmospheric pressure changes, the air becomes heavy. As a result, the methane gases that are in the septic tank do not flow as they normally do through the vent. Instead, they remain low to the ground and this causes a foul smell, more like rotten eggs.

Why does my house smell like rotten eggs after it rains?

Hear this out loudPauseWhen it rains, the atmospheric pressures change, making the air heavier. The heavier air does not allow the methane gasses found in your septic tank to run through the vents. They stay low to the ground, smelling of rotten eggs.

Why does my house smell like sewage or poop?

Why does the house smell like sewage or poop? Why Your Home May Have a Sewer Smell A sewer smell in house can be extremely irritating, especially when you aren't sure what the cause is. It may be a crack in a pipe or other part of the sewer system.

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