A rotten egg odor permeating your house can be caused by a hazardous natural gas or propane leak from a gas appliance, a dried-out plumbing floor drain trap allowing sewer gases to escape, or sulfur bacteria reacting within your water heater tank. Natural gas utilities add a distinct sulfur scent (mercaptan) specifically to make gas leaks detectable. If the odor is localized strictly to hot water taps, it points to the water heater's anode rod. Verification: Check all gas appliance shut-off valves and pour water into plumbing drain traps to ensure they are sealed.
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