Yes. Moisture in your crawl space provides mold with the perfect environment to grow. Crawl spaces are often constructed with organic materials such as wood. Mold needs humidity and organic materials in order to thrive. Flooding in your crawl space eventually evaporates and creates the necessary humidity. Moreover, as the humid air rises into your home, it carries mold spores into the rest of your house. Eventually, you’ll be dealing with a full-fledged mold infestation that all stemmed from crawl space flooding.