Dampness on front passenger floor

Recently there's a damp spot in the middle of my front passenger floor. I picked up the carpet and there is wetness. It's not near the door. Any idea what could be leaking? Thanks in advance.

heater core smell it it should smell sweet and that is what antifreeze smells like when your heater core goes bad alot of times it leaks in the cab of the car another good indication is check your water you should be low if so then you know

Go smell it, come back and describe the scent.