That Strange Odor Coming from your Sewer Pipe could be caused by Sewer Gas

Posted: Aug 21, 2012
Author: Minyard Plumbing, Inc.

Sewer gas is a mixture of non-toxic and toxic gases which are produced and collected in a sewer pipe system. It develops as a result of industrial or household wastes and may contain any of the following: ammonia, hydrogen sulfide, carbon dioxide, methane, nitrogen oxides, and sulfur dioxide.

Incorrect disposal of petroleum products like mineral spirits and gasoline contribute to sewer pipe gas hazards. These gases are of concern because of their potential to create explosions or fires, health hazards, and odor.

Sewer gases are typically prevented from entering buildings by traps that create water seals at possible points of entry. Furthermore, plumbing vents in the sewer pipes allow gases to be expelled outdoors. Plumbing fixtures that are not often used can allow gas to enter a home when the water in the traps evaporates, especially in dry weather.

Contact with sewer gases can also occur when gas seeps through a leaking sewer pipe or drain, or through a crack in the building’s foundation. This type of gas is heavier than atmospheric gases and may build up in basements and eventually contaminate the surrounding air. People who work on farms or in sanitation industries may be exposed to it especially while cleaning septic tanks, municipal sewer pipes or manure storage tanks.

In most residential dwellings, sewer gas has a disagreeable odor, but it doesn’t often pose major health hazards. A residential sewer pipe primarily contains gases found in the atmosphere – carbon dioxide, oxygen, nitrogen, etc. But, if an odor does occur, it would be wise to call a plumber.