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