Water sensor waterproof?

It's super early in the morning here and i cant seem to find my answer. We are currently having a flood in my area. My basement gets water in it sometimes so I'm looking at grabbing a few of these sensors to add to my syatem. I'm wondering however, if these are truly waterproof, one of the areas i want to put it in, the device would definitely be submerged before i could get to it and i dont feel like having to switch out sensors all the time. Thanks guys!