The passenger side floor is getting wet after the car is parked for a few days. I can't seem to identify where the water might be coming from. I ran water over the passenger door and saw now water intruding. I do not have a sunroof so that possibility is ruled out. Any other ideas as to where I can look?

 

Have you had the a/c on recently? If so, the drain on the box that collects condensate water might be clogged, and spilling the collected water into the footwell (especially if it's full and you're parking on a hill). It's located in the passenger footwell near the firewall.

Sounds dumb, but might be worth checking out.

 

I've got a very similar leak right above the ECU. Mine however is the windshield

 

I think you might have a leaking windshield. Is the windshield original?

 

Sit inside and have someone run a water hose on the outside.

 

x2

 

I had a similar issue in my 95 sedan and traced my issue to old/cracked/weathered seam sealer near where the hood hinge is located. Like said above, remove the carpet on that side and stick your head up there with a flash light and it should be somewhat easy to trace where the water is coming from!