Interior problem
2002 Mitsubishi Lancer 4 cyl Two Wheel Drive Automatic

The floor on my drivers side (both front and back) have recently and mysteriously filled with water. no mat where we check (including seals on driver side doors, trunk, under the hood, and even the roof) and there is no reason for this odd leak. I'm not sure how to fix this, and I need to know where else I could look! Thank you much:)