House Smell and Odor Problems
Odors are diagnostic. Sulfur or rotten egg means gas until proven otherwise, because utilities add mercaptan to odorless natural gas specifically so you smell it. Burning plastic means electrical heat. Musty means moisture and microbial growth. Sewage means a dry trap, a failed vent or a broken drain line.
Musty & damp odors
Mold, mildew and damp materials.
Sewer & sulfur odors
Drains, traps, vents and septic systems.
Gas & burning odors
Fuel gas, electrical heat and combustion.
Smells & Odors questions homeowners ask
What should I do if I smell gas?
Leave immediately without touching switches, phones or garage-door openers, then call 911 and your gas utility from outside. Do not attempt to find the leak yourself.
Why does one bathroom smell like sewer?
A trap that has dried out in a rarely used fixture is the most common cause. Pour two cups of water down every drain, including floor drains, and re-check in 24 hours.