If it's not from the wiper pivot seals, then it's probably from the windshield seal gasket. Mine leaked between the gasket and bottom passenger side corner of the windshield frame and pooled at the front of the passener foot well.
Yeah, the windshield gasket...If it's ever had new glass installed, it could be thinner than the original glass and allow water to enter around the glass. Seen it happen more than once.