Recently just moved into a house. (Little over a week ago) Theres a washer hook up in our half bath. With the drain pipe in the center of the dry wall. This morning I notice a ton of water on the floor, and we couldnt find the source. Come home from an errand an hr ago and we hear water flowing. My husband and I head into the bathroom and we see water gushing from the washer drain pipe. Currently there is no washer hooked up, we haven't had one hooked up since we moved in. There was about a good inch or two on the floor. My husband just thinks its bc its rain alot this past week... has anyone had this happen to a washer drain that wasnt in use? Or may even have any ideas what it could be???