Just dropped my phone in the toilet(it was clean water) and miraculously it's still working fine lol Maybe it's waterproof and I wasn't aware because it was completely submerged only for about a second though.
You shouldn't use it though. I dropped my phone in the bathtub some months ago and it was working fine for most of the day and then it started having all kinds of electrical problems. Take out the battery and don't touch it for a few days. Let it dry out.