When a rotten egg or sulfur smell emanates from only one specific faucet in your entire home rather than all taps, the issue is typically isolated to that individual fixture's plumbing path. Common causes include organic slime, bacteria, or hair buildup trapped inside the aerator screen or drain P-trap of that specific sink. When you turn on the faucet, air currents push trapped odors out of the dirty drain opening or aerator, making it smell like sulfur even though the incoming water supply is completely odorless and clean. Verification: Unscrew and clean the faucet aerator screen and flush the drain with baking soda and vinegar.
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