I would say no for a few reasons:
1: The SIM card tray and the MicroSD card tray do not appear to have any seals, and I think water can get in via the eject hole.
2: As above, the earphone jack isn't sealed, nor is the USB plug.
3: The iFixit teardown doesn't show any rubber seals or O-rings. It does show very well-fitting construction with glue used... but I don't think anything there is watertight so a dunking will get water inside the device.