10/07/2026
That basement smell? Here’s what it might be.
Heat’s on, AC’s off, and suddenly the basement smells… off. Fall is when we get the most calls about basement smells in Fairfield County. Here are the usual causes:
Dry drain traps: Floor drains and unused sinks lose their water seal over the summer, and sewer gas comes right up. Fix: pour a gallon of water down each drain. A spoonful of mineral oil on top slows evaporation.
Mold or mildew: Summer humidity plus a cool, closed-up basement gives you that musty smell. Check corners, boxes, and behind stored items. Run a dehumidifier.
Furnace start-up: A burning-dust smell the first few days is normal. If it lasts, call your HVAC tech.
Dead rodents: This is the one people don’t expect. Mice move inside in the fall, and when one dies in a wall or ceiling, you’ll smell it. A strong, sweet, rotten smell that gets worse each day is a warning sign.
Wildlife droppings and urine: Mice, squirrels, or raccoons nesting in the basement or crawlspace leave a sharp ammonia smell.
If you’ve refilled the drains and the smell is still there, the source might have four legs. We’ll inspect, find the source, and seal up the entry points so it doesn’t happen again.
📞 Call 203-654-0630
🌐 scribnerpestandwildlifecontrol.com
Family-owned and serving Ridgefield, Danbury, Newtown, Bethel and all of Fairfield County.
PEST CONTROL SOLUTIONS that are Safe, Reliable & Affordable. We service the following towns in CT: Ridgefield, Westport, Wilton, Danbury, Brookfield, Newtown, New Milford, New Fairfield, Sherman, and Bethel.