Smelling a gas-like odor when thorough testing confirms there is no actual gas leak is a relatively common issue usually caused by harmless chemical or biological byproducts sharing similar sulfur compounds. For example, rotting organic matter decaying inside a kitchen garbage disposal or a backed-up sink drain produces sulfur gases that smell identical to the mercaptan additive in utility gas. Similarly, a dried-out plumbing P-trap in an unused bathroom allows sewer gases to escape into the room. Other potential causes include melting plastic from a nearby appliance cord, sulfurous well water, or stagnant slime in an HVAC drain line. Always prioritize safety by airing out the home and having a professional double-check for peace of mind.
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