Washer Smells Like Sewage — Drain Trap, Venting, Standpipe Setup, and Biofilm (One-Page Fix Guide)
Washer smells like sewage? It’s almost never “just the washer.” It’s a drain-air pathway, biofilm, or both. A true rotten-egg / sewer smell usually means sewer gas is getting past a plumbing barrier (trap/vent/standpipe setup). A musty / swampy / dirty-sock smell usually means biofilm is living in hidden wet zones (gasket folds, pump filter, … Read more