Whether you should call a plumber depends entirely on whether the rotten egg smell is isolated to your hot water system or indicates a potential gas leak. If the sulfur odor is restricted strictly to hot water taps, it is typically caused by bacteria reacting with the water heater's anode rod—an issue you can resolve by flushing the tank or replacing the rod, though you can hire a plumber if you prefer professional service. However, if the rotten egg smell pervades your entire house, it could indicate a dangerous natural gas or propane leak, requiring immediate professional intervention or emergency utility assistance. Verification: Check gas appliances and test water taps to determine the exact origin of the smell.
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