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If you believe there are high concentrations of sewer gas in an enclosed space, evacuate the building and call the fire department for help. Also, avoid creating an ignition source, such as a spark from an electrical appliance, match, or cigarette lighter.

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Very low oxygen concentration levels (less than 12%) can cause unconsciousness and death very quickly and without warning. The most concentrated levels of sewer gas collect where it’s entering the home, which is often in basements.

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If the leak is behind the wall, you may need to hire a plumber to find the source and fix it. Some local public health departments offer home inspections.

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Certain symptoms suggest exposure to gases like methane or carbon monoxide, which are odorless, or hydrogen sulfide, which smells like rotten eggs. These symptoms include:

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First, try to follow the odor. Locate the point of entry, if possible, such as a basement floor drain. Then, check for a blocked rooftop plumbing gas vent. By adding water to the floor drain or removing debris from a vent, you may be able to prevent sewer gas from entering your home.

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At high concentrations, hydrogen sulfide can interfere with the sense of smell, making it harder to use the gas’s distinct odor as a warning sign. In extremely high concentrations, hydrogen sulfide can cause loss of consciousness and death.

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Sewer gas is a complex mix of toxic and nontoxic gases that forms when household and industrial waste decay. The concentration of sewer gas typically varies depending on the source. Highly toxic components of sewer gas include hydrogen sulfide and ammonia.

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Sewer gas can enter a home through a floor drain, from a leaking or blocked plumbing roof vent, or (if the gases are in soil next to the house) through cracks in the foundation. Sanitary and farm workers can be exposed to sewer gas when cleaning and maintaining:

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Severity also depends on the length of the exposure, the concentration of the gas, and whether it was eaten, inhaled, or touched.