The primary chemical compound responsible for the classic rotten egg odor is hydrogen sulfide (H2S), a colorless gas that occurs naturally in certain groundwater sources, decaying organic matter, and sewage systems. Additionally, natural gas and propane suppliers artificially inject chemical odorants known as mercaptans (specifically tertiary-butyl mercaptan) into utility gas supplies. Because natural gas is naturally odorless, mercaptan is added so that even trace gas leaks produce a strong, unmistakable rotten egg scent that alerts occupants immediately. Verification: Check utility guidelines regarding gas odorants and test water supplies for hydrogen sulfide presence.
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