It occurs when the P-trap is dried out or if you don't have proper ventilation to stop sewer gases from leaking into your home. Sewer gases can make you sick because they contain hydrogen sulfide (H2S) and methane. Sometimes, gases might get pulled down into the yard, hence a foul sewage smell outside your house.Apr 21, 2021,
A sewer smell in your home is most likely caused by a buildup of sewer gas in either the plumbing or venting system in your home. A dried out p-trap is a common reason for sewer odours. P-traps that are dried out no longer prevent sewer gas from escaping your pipes. A possible fix is to pour water down your drains.
If left unchecked, sewer gasses can be harmful to your health, home, and your plumbing system. If you smell unusual odors or sewage, it's important to call a plumber straight away.
A sewer smell outside your house can mean that the city sewer is backed up. But if the smell is constantly present it can have to do with your roof leader line outlets, or area drains. Although storm sewer systems should not contain sewer gases, sanitary and combined sewer systems do.Jun 23, 2014