Public health guidance highlighted in a new MSN advisory warns that flood-damaged homes may not be safe to occupy until they are fully cleaned, disinfected, and dried. Standing water and saturated building materials create the conditions for rapid microbial growth, and visible mold can emerge within 24 to 48 hours of water intrusion.
For people with histories of biotoxin exposure or chronic inflammatory response syndrome (CIRS), re-entering a water-damaged structure prematurely can trigger or worsen symptoms. Drying alone is not sufficient when porous materials such as drywall, carpet padding, and insulation have been saturated; these typically need to be removed rather than salvaged.