The answer to 'why is my hardwood floor water damage' is that hardwood floors can become damaged due to excessive exposure to water or moisture. This can happen from things like spills, leaks, high humidity, or flooding. Some common symptoms include cupping, warping, discoloration, and mold growth.
The best solution depends on the severity of the damage. For minor issues like small spills, you may be able to address it with quick cleanup and drying. But for more extensive damage, you'll likely need professional hardwood floor repair or replacement to properly address the underlying cause and restore the floor.