Sewer fumes and gas typically possess a distinct, unpleasant odor resembling rotting eggs, sulfur, decaying organic waste, stagnant swamp water, or old garbage. This characteristic smell is primarily caused by hydrogen sulfide gas produced by anaerobic bacteria breaking down organic matter inside drainage pipes and municipal sewer mains. However, dangerous sewer gases like methane are completely odorless, meaning you should never rely solely on your sense of smell to gauge overall air safety. Verification: Investigate any sulfur or rotten egg odors immediately by checking plumbing P-traps and calling a professional plumber.
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