Mystery water leak on drivers side floorboard
 

2003 Hyundai Accent 4 door.
Well its been raining here in Portland Oregon non stop and this morning I went to get in my car and smelled a mildew odor so I took out the drivers floor mat and the carpet was soak. Then I laid back the carpet and that grey spongy covering thats under the pedals was soaked to the bone like a sponge. I did a test with a water by putting the hose on top of the roof of the accent and turning it on full bore and nothing leaked in the car .I sat in their for a good 5 minutes with the hose blaring down the windshield and door sides. I even took a jack and lifted the car up too see if there was any cracks or a rusty hole underneath but nothing . So Im completely stumped on this I do have A/C and the drain hose is clear since I have been using my defrosters and the A/C pump kicks on. Any advice?

If you've been using the windshield defog (A/C) and you can't find a outside leak, I'll bet the A/C drain hose is at least partially blocked.