Hey @Maethridge. While the device is engineered to be air-tight, it is not meant to be submerged under water during normal operation. My best recommendation is to mount up the Flood/Freeze Sensor on the wall near the floor, maybe up an inch or so, so you can still get to the sensor before the water rises and it’s submerged. Additionally, you could still put it on the ground, but still somewhere accessible so you could “save it” from being submerged once you get the notification that water was detected. Hope this helps!