Why is water Suddenly Seeping through my tile grout joints? – I have a question about water seeping up through grout of a tiled floor. This is in South Florida. The tiles are 18″ x 18″ ceramic. They were installed approximately 10 years ago. Never really had any problems. Recently, the city decided to run a 36″ gas line maybe 20′ from the back of the house. I am now observing water coming up through the tiles in various locations in the house. In addition, there is white residue staining on many of the grout lines. Could the problem be related to the recent construction? Do you think the floor slab is compromised below the tile? What could be the reasons of this?