Yes, Marble CAN be Damaged by Water
Overexposure to moisture may result in accelerated weathering, the manner in which stone, grout and other reactive and porous materials degrade and discolor. In this situation, water migration through the grout joints led to staining along the edges of the stone tiles.
Efflorescence, which is the deposition of soluble salts onto the surface of porous materials, is visible over much of the stone-tile flooring and resulted from vapor and/or moisture transmission, as environmental conditions attempt to equalize humidity levels inside a home. Once levels are normalized, restoration can begin. Yet, in some situations, stains can be permanent depending on the minerals and the extent of moisture exposure.