The OnePlus 5 has no IP rating. In other words OnePlus has not guaranteed any kind of water resistance on their phone. This seems like a lacking feature on the phone since most other flagships offer it. The device has now been water tested on youtube. In the video above the phone sits in a bowl of water for more than an hour and continues to work afterwards. While the phone may not be officially water resistant you may not have to worry if it accidentally gets a bit wet.