BMW Repair: BMW water leak, steady rain, best bet

Question
My BMW has water accumulating in the rear floors during a steady rain. It does not seem wet around the inside of the sunroof. Where can the water be coming from?

Answer
Wow honestly if I knew where they came in I would have all mine fixed.I have many and they all seem to leak somewhere.Your best bet is to have someone wet it down while inside looking for water.It is a real task sometimes because they seem to leak always in the rear of the passenger side.So a water test is about the only way to determine where the leak is.