Posted Thursday, October 30, 2025
If you notice a rotten egg smell around your home, your plumbing or septic system could be the source. That odor comes from hydrogen sulfide gas (H2S), created when bacteria break down waste in low-oxygen conditions. Septic tanks naturally produce biogas made of methane, carbon dioxide, and trace amounts of hydrogen sulfide, but under normal conditions, those gases remain sealed inside or vent safely through your plumbing. When you can smell them, gas is escaping somewhere it shouldn’t.
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