Water damage arises from fire damage, blocked drains, broken pipes, appliances that have malfunctioned, storms, and so on. The kind of treatment needed depends on the nature of damage. Some water should be considered hazardous because they carry contaminates, such as a sewer back-up.
Restoring the damage caused by water damage depends on the speed that your building and personal property can be dried. Clean water if neglected can also generate mildew and bacterial growth.