Why Humidifiers Leave White Dust Everywhere

If your humidifier leaves white dust on furniture or nearby surfaces, it’s usually caused by minerals in the water. When tap water is turned into mist, the water evaporates but the minerals don’t, so they settle around the room and build up inside the humidifier over time. This video explains where white dust comes from, why it happens more often with hard tap water, and simple ways people reduce buildup, such as using distilled water or cleaning the unit more often. For most people, white dust isn’t dangerous, but it can be annoying and lead to extra maintenance.