A sewage or rotten egg odor coming from your water heater is typically caused by sulfur-reducing bacteria reacting with the sacrificial anode rod inside the storage tank. When organic bacteria interact with natural sulfates in the water supply, they produce hydrogen sulfide gas, which creates an intensely foul smell resembling sewage or rotten eggs whenever you open your hot water taps. Additionally, decaying organic matter trapped in dry plumbing floor drain traps can mimic this odor. Verification: Test whether the smell occurs exclusively on hot water taps or both hot and cold lines to isolate the tank.
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