The answer to 'grout water damage' is that it is a common problem that can be caused by leaks, excessive moisture, or improper installation. Symptoms include discolored, cracked, or crumbling grout that can lead to further water damage and mold growth. Solutions depend on the extent of the damage, but often involve repairing the source of the leak, drying out the area, and re-grouting the affected tiles.
For minor grout water damage, homeowners may be able to DIY the repair by cleaning and re-sealing the grout. However, for more extensive damage or if the underlying cause is not addressed, it's best to call in a professional cleaning or tile restoration service to properly assess and remediate the issue.