One problem related to water pump has been reported for the 1999 Toyota Camry. The most recently reported issues are listed below.
Additional info to odi number 765034 - shop mentioned that the water pump damaged caused scrapping on the engine block. Since the engine block is made of an aluminum base his concern was that the marks might cause a crack to occur. He said no leaking was seen at this time but I want to put on record that damage was made to the engine that might cause problems in the furture. This scraping was due to the water pump failure that was noted in the odi number 765034 questionnaire. This info was also mentioned to Toyota in a certified letter but I have not received any response yet from Toyota.