When water emits a strong sulfur or rotten egg smell the moment you turn on the tap, it is typically caused by hydrogen sulfide gas, sulfur-reducing bacteria, or dissolving minerals present in your water supply. If the smell occurs exclusively on hot water taps, it indicates that harmless bacteria inside your water heater are reacting chemically with the magnesium anode rod. If the sulfur smell appears on both hot and cold water taps simultaneously, the source originates upstream in your municipal water source, well pump, or private plumbing supply network. Verification: Test both hot and cold taps independently to isolate the exact source of the sulfur odor.
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