Here is how to check.
Get a bucket, fill said bucket with water (salt preferably).
Go and get your iPad, I will wait here....
OK, got it?
No, right, how about now? OK, good.
Turn the iPad on, drop it in the bucket.
Leave it for about 3 minutes, this has to be done to ensure the thoroughness of the test.
Remove the iPad from the bucket of water with rubber gloves.
Check all holes and ports, if you see a pink/red spot where it was once not, it is water damaged and Apple can tell.
If you see no red, take it to apple, see if they will replace your now busted iPad.