You should become seriously concerned about a rotten egg smell when the odor originates from your home's gas supply lines rather than your water heater. While a sulfur smell coming from hot water is usually harmless bacteria reacting with the anode rod, a persistent rotten egg smell across the entire house can indicate a dangerous natural gas or propane leak from a gas appliance valve or supply pipe. Callout type="warning" title="Gas Safety Warning": If you suspect a gas leak, evacuate the house immediately, avoid using electrical switches, and call your utility provider from a safe distance. Verification: Check gas meter dials or appliance connections with a soapy water solution.
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