Each water-damaging event presents an opening for mold to grow from dormant spores or other microbial growth. The source and type of water, as well as the volume of the water, the ambient temperature, and the length of time the moisture has been present, all have a direct bearing on the amount and types of microbial growth species. It is critical to take action as soon as you understand that a water damage loss has occurred. Growth can begin within 72 hours in some cases.