While it is true that when they presented the Apple Watch in September of last year, it was said that this device would withstand the water but with limitations, Apple's CEO seems to have confirmed on his trip to Germany that the new wearable will withstand more than typical splashes of water. The CEO explained that he does not take off his watch even to bathe and further clarified that charges your smart watch every night.
This can be somewhat contradictory and of course it may be due to misinterpretation by Apple managers in German territory with whom Cook spoke, but in any case the news is there and we do not believe that Cook wanted to say that he is going to the beach with the Watch.
We doubt that good old Cook does not know how to treat his watch as it deserves, so we imagine that all this is a misinterpretation and the Apple Watch is capable of withstanding the water but not to take it to the sea. Anyway there is little left to see What type of IP certification does this wearable carry? from Apple. What is certain is that taking this watch to the beach can be something normal in the lives of many users, so adding a necessary certification for it would be interesting.
Taking a shower at home or washing your hands with your watch on is something many users do and is possibly what Cook retired to. As far as we know nothing official has ever been commented on the certification that this watch will have, something that may have been improved in these months since it was presented, from Apple you can expect anything ...