Yes, a rotten egg or sulfur odor coming from your tap water is a significant concern that requires investigation. This smell is typically caused by hydrogen sulfide gas produced when sulfur-reducing bacteria interact with your water heater's magnesium anode rod or contaminate your well water supply. While harmless in low concentrations, the odor is unpleasant, and in rare cases, high levels of hydrogen sulfide or associated bacteria can indicate water contamination. Verification: Test whether the sulfur smell occurs only on hot water or both hot and cold taps.
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