Water leaking under rear seat
 

I have two puddles underneath my rear bench seat in my 2004 chevy blazer driver side and passenger I cant figure out where its coming from my blazer does have a sunroof but I'm convinced its coming from somewhere else any help would be greatly appreciated

Does it come rain or shine? Does it happen only when washing rear window with washer fluid? Wondering what are the conditions when the water appears.

Usually when it rains I'm trying to locate a rear drainage hole but I can't seem to find it I already cleaned out the front two

My 03 does the same thing, every time it rains. Mine also collects somewhere around the roof. When I drive up my driveway it leaks in. My rear cup holders always have water in them after a hard rain as well. The whole car sounds like I'm on a waterslide for the first few turns.