I had more than a liter of water under the passenger footwell carpet shortly after having my windshield replaced. It rained the day that happened, and the job was outsourced (without me knowing that) so for all I know they let it rain in or even towed it with no windscreen?!?
It stayed damp forever until I removed the mats and dried out the carpet using old towels and a lot of pressure. Even so, venting the footwells was necessary for months after to prevent fogging up.
Someone said the A/C could be leaking waste water into the cabin. That could be your problem, even if it wasn't mine.
Or something stupid like they moved and broke a big mineral water container.
2011 Insight Elegance
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Accord horn, Waxoyl, HIDs, Green Oil, UltraGauge, LEDs, full upper&partial lower grille block, aero tweeks, plans for several eco mods