Not quite .....
They can be damp just from condensation. They are wet if they're washed down regularly. Plust, the health folks frown on things like screws, or holes in boxes, that may let crud fester.
That's why the piping is often stood off the walls - to allow for cleaning behind the pipes.
You need to know more than just the NEC to practice the trade. I strongly advise a chat with your health department before you do the job.
