No water damage is acceptable. None, nada, zero, zilch.

Yes, seriously, everyone at PBS is not only expected to know the posting guidelines, but abide by them as well.

No water damage, no stained and ripped pages.  You can always offer up books that don't meet the posting guidelines as freebies with an order from your shelf.

I think the OP was being sarcastic and implying that she's getting a lot of water damaged books. 

What makes me mad is that I quickly look over my books and then mark them received.  When I finally get around to reading them, I'm discovering a lot of interior water damage (like someone rested a glass on the book pages while it was open).  By the time I see it, it is too late to mark RWAP.  A number of these books have been WLed.

They rules say NO water damage.  In my opinion (which I know doesn't count) that is much too strict.  But I can imagine why they created that rule.  If they said something like "only minimal water damage is acceptable" then there would be unlimited interpretations on what minimal, so they have to say no water damage.  The same with stains. 

I would say that 11/12 of the books I have received via PBS have been in excellent or like new condition.  The one that wasn't (cover somewhat worn and creased) was still postable,That being said, I have not and will not ever go through a newly received  300 page book I received that looks marvelous, and ask for my credit back if there was a small water mark or tiny stain on say, page 223 (so it is possible that even one of more of the like-new books I received was technically an unpostable).  I do not think it is reasonable to expect the sender to scrutinize his/her books to that extent.