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Causes of Sewer Gas Smell Inside a House

  Causes of Sewer Gas Smell Inside a House A persistent “sewer gas” or rotten-egg smell inside a home is most often linked to plumbing and drain systems that are failing to keep gases contained. While the odor is unpleasant, it can also signal a ventilation or blockage issue that may require prompt attention.   “Sewer gas” typically refers to gases produced in wastewater, including hydrogen sulfide, which can smell like rotten eggs. These gases can enter a house when they bypass the traps and vents designed to keep them out.   Dry or broken water seals in plumbing traps   Inside most sinks, tubs, and floor drains are P-traps or S-traps that hold a small amount of water. That water acts like a seal, preventing sewer gases from escaping through the drain. If the seal dries out (for example, a rarely used bathroom) or a trap is misinstalled, the odor can appear.   Similarly, plumbing leaks under a sink or a loose fitt ... Read more »
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Causes of Sewer Gas Smell Inside a House

 Causes of Sewer Gas Smell Inside a House


Causes of Sewer Gas Smell Inside a House

A persistent “sewer gas” or rotten-egg smell inside a home is most often linked to plumbing and drain systems that are failing to keep gases contained. While the odor is unpleasant, it can also signal a ventilation or blockage issue that may require prompt attention.

 

“Sewer gas” typically refers to gases produced in wastewater, including hydrogen sulfide, which can smell like rotten eggs. These gases can enter a house when they bypass the traps and vents designed to keep them out.

 

Dry or broken water seals in plumbing traps

 

Inside most sinks, tubs, and floor drains are P-traps or S-traps that hold a small amount of water. That water acts like a seal, preventing sewer gases from escaping through the drain. If the seal dries out (for example, a rarely used bathroom) or a trap is misinstalled, the odor can appear.

 

Similarly, plumbing leaks under a sink or a loose fitt ... Read more »

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