If the footwell is damp, could be the drainage hose from A/C system. It is odly shaped (dogleg) and it collects dirt at kink. Clean that, up to half a kilo of dirt is inside; once it blocks drainage of condensed water it starts overflowing and damping the footweel.
Check the grommet under the wiper motor, it is most probably perished.
The other possible point of entry is up. On Pumapeople there is a good guide for the water ingress on puma..