There could very easily be a vent pipe where you drilled. Water would not spray out, as it is a vent pipe and not a water line. Usually the laundry area is near your garage attic access, so you could go in the attic and look over to see if you see a vent pipe above where you drilled.
If this vent pipe does not have a vacuum breaker on top of it and goes through the roof, whenever it rains you may have a problem.
I would not be comfortable assuming all is well. Hope this helps!
Frank
__________________
Florida licensed Home Inspector #HI688. (352) 250-7818
|