Can smell gas but no leak?

Smelling a gas-like odor when there is no actual gas leak present is a relatively common occurrence often caused by harmless household byproducts or chemical reactions. For example, rotting organic matter decaying inside a kitchen garbage disposal or a backed-up sink drain produces sulfur compounds that smell identical to the mercaptan additive put in natural gas. Similarly, a dried-out plumbing P-trap in an unused bathroom can allow sewer gases containing hydrogen sulfide to escape into your living space. Other potential causes include spoiled food, melting plastic from a nearby appliance cord, or stagnant water in HVAC drain lines. If you ever smell gas, always prioritize safety: check your appliances, ventilate the area, and contact your utility provider or a professional technician to confirm there is no hazard.