I have a bathtub that the backside is against the garage wall. Ive been noticing water puddling in the garage against this wall. I cut a small piece of sheetrock off to look inside the wall to see where the water was coming from and think that it may be coming up around the bathtub drain. I have a concrete slab foundation and the house is only 9 years old. I've been trying to keep an eye on it to see when theres more water, it seems as if after a storm theres more water there. Is it possible that the storm water is coming up through the area around the drain for the tub? If so, how can i fix it?