The drivers side floorboard fills up with water during heavy rains. It does not appear to be coming in from the sunroof or windows as the door panels and the seats are dry with no evidence of water running. I checked and cleaned the drain hoses from the space under the hood at the bottom of the windshield and it still leaks. Any ideas where this could be coming in from?

 

Check the drain hoses in the A-piller.
You have to remove the panels inside along the windsheild to see the hoses.