What would cause the passenger side floorboard of a 2002 Pontiac Bonneville to get wet?

The passenger side floorboard of a 2002 Pontiac Bonneville could get wet due to several reasons, including a clogged or damaged windshield drain, which allows rainwater to seep into the cabin. Another common cause is a leak in the heater core, which can release coolant inside the vehicle. Additionally, worn weather stripping around the doors or Windows could let water in during rain. Lastly, a faulty door seal or a cracked windshield may also contribute to moisture accumulation in that area.