Yes, I would throw away all those plastic pitchers already. I know that it is somewhat crazy. I always say that in the eraly ages, there is no such label as 1,2,3 and so on at the bottom of plastic bottles or containers for you to be able to know how long should you use it. Today, when it is labeled or marked 1, you should only use it once? Then, it should have not been marketed anyways or should have a warning, throw after use.
Sometimes, I would like to stop reading about health. As our Chemistry professor said once, if you would really follow everything in the book then you would not eat nor take anything at all because it turn out that everything has germs in it.