Drain Odor: Causes and Solutions

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The smell of sewage in your bathroom could indicate a problem with your drain or vent system. If your drain is partly clogged, there could be odors coming for mold or mildew in the pipes. Each of your appliances should also have a p-trap or s-trap that is installed under the immediate drain. This trap, when installed correctly will keep odors from entering your bathroom. Sewage smells could be due to an incorrect installation of this trap. All drains also need to be attached to a vent that exits through the roof of the house. If this is clogged it will cause sewage odors to back up into the home. This odor is not only unpleasant but can be a health hazard, as it is a buildup of methane gas, which is flammable and hazardous to breath. For these reasons you will need to find the source and make repairs as soon as possible

http://home.howstuffworks.com/home-improvement/household-hints-tips/cleaning-organizing/sewage-small-in-your-bathroom.htm

http://www.ehow.com/info_12115260_sewer-gas-smell-after-taking-shower.html

 

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