The water may recede, but flood damage can remain
Flooding causes problems wherever it happens. Some of these problems are not visible to the naked eye. You might be able to smell the microbial deposits left behind, and this should be a warning that even floods that barely cover your floor can pose risks long after they are gone.
Flood damage can cause damage to a home's structure, including the foundation or walls. The higher flooding becomes, the more damage there can be to walls, furniture, and staircases. Microbial activity, however, can occur in areas well above the flood line. Because humidity levels greatly increase indoors when flooding exists, it becomes much more likely that microbes such as mold and bacteria might be inhaled by those present in the home. Also, these microbes are also more easily deposited in locations that might have otherwise remained uncontaminated.