If you strongly smell the characteristic sulfur scent of gas inside your home but professional tests or soap-and-water inspections reveal no actual gas leak, the odor is likely coming from a harmless non-leak source that mimics mercaptan. Common culprits include rotting food waste trapped in a kitchen garbage disposal or sink drain, sulfur gases rising from a dry plumbing P-trap or sewer vent, or melting plastic wire insulation from an overheating appliance. Additionally, sulfur-bearing compounds in well water or stagnant biological buildup inside HVAC condensate drain lines can create false alarms. Even if no leak is found, always prioritize safety by ventilating the space and contacting your utility provider to rule out any hidden hazards.
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