I have a 2006 Pontiac G6 - it has heavy condensation leaving floor boards wet

Yes it could be from the ac evaperator drain backing up into the car. It can also be a water leak from the outside when it rains or coolant from a heater core. You need to have the car inspected as we won't be able to guess without a hands on inspection. Use this link to find a shop near you. https://repairpal.com/repair-shops Alex