Have you been adding any coolant? You could have a leaking heater core, which will usually leak to the inside, wetting the carpets in the well. Most American cars locate the heater core on the passenger side of the firewall, so a leak will typically show up on only the passenger side floor. I once had an Audi that had the heater core mounted just about dead center on the firewall. When it started leaking, both sides of the well(s) got wet.
If it doesnt smell like a coolant then there may just simply be a small plug has become loose on the front panels or the rain water is making its way in from the roof down behind the panels. This happens if there is a small blockage in the rain water gulleys as the water will find the easiest route.
A simple way to find out is remove a interior side panel , Get a little talcum powder , puff a little on the side. Go outside and tip water down that side and see if the talc becomes wet. You may see the trail of water flowing.
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