When water flows down a drain toward the sewer, it creates an area of higher pressure in front of it and lower pressure behind it. If there is not proper ventilation, this pressure differential can lead to backups and slow draining, which can cause an odor to permeate throughout your home.,
A dry P-trap is one of the most common causes of sewer smell in your bathroom. The P-trap is a U-shaped pipe located under the sink or drains. It is used to trap water beneath the drain, preventing sewer smells from reaching the bathroom.Mar 8, 2021
If your bathroom has a sewer smell or even a sewer gas smell, it's usually due to a sewer backup. The good news is that sewer backups are often easily fixed by either snaking your drain or installing a new trap line and sump pump system.Jul 28, 2021
Sewer odor comes from the breakdown of human waste and includes harmful gases like hydrogen sulfide and ammonia. Small doses of these gases won't harm you, but chronic exposure can be toxic. Any time your house smells like sewage, you need to identify the problem.