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Leak in heater core
It could be the heater core leaking.
Leak on drain line above floor level
Check the AC evaporator drain line...is it not connected to the outside
water in passenger floorboard, where is the hose that would cause this?
Maybe a bad heater core
Wet passenger flood is caused by either a leak in the air conditioning drain line or a leak in the windshield sealant or a coolant leak coming from the heater core.
A damaged heater core will cause coolant or water to leak onto the passenger floorboard.
A poor seal or a split.
If the leak is by the passenger floor-- could be the heater core check to see if this leak is engine coolant or just water. Could be a leaking windshield seal could be a door seal could be evaporator line is plugged
Are you running the air conditioner? If the drain line is plugged, it will leak water (condensation) onto the passenger side floor.
a leak or a bad master cylinder