Water and flood damage certainly has the potential to cause mold growth. Because mold thrives in moist environments, any place that is wet (or humid) is a perfect place for mold to grow. If you ignore the moisture, mold can begin to grow within 24-48 hours. It’s very important to take immediate action when you experience house flood damage of any type! For the health and safety of your family mold should be treated by professionals with the right sporicidal chemicals and equipment.