Damp-earth odor

Soil-like odor that may enter from a crawl space, basement, drain or wet landscaping.

First distinction

Note where the odor is strongest, whether it appears with rain, wind, heating, plumbing or ventilation, and whether closing a door changes it.

Do not mask the pattern

Fragrance can make the pathway harder to identify. Record timing before cleaning or moving stored material.

Next useful step

Compare nearby materials and systems, then use one controlled isolation check at a time.