When your hot water smells like rotten eggs but your cold water smells completely normal and fresh, the issue is isolated entirely inside your water heater storage tank. This occurs when naturally occurring harmless sulfur-reducing bacteria react chemically with the tank's standard magnesium sacrificial anode rod, producing hydrogen sulfide gas. Because cold water bypasses the water heater tank entirely, it remains free of the sulfur odor. Verification: Check cold water taps to confirm they are odorless while hot taps emit the sulfur smell.
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