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if it's just water, check the door gaskets. if it's coolant, you'll most likely need a heater core. past that, have someone spray water on the car while you look for where the water is getting in. you may need to pull the carpet back some to see.
You could have a windshield that is leaking water. Often this water will trickle down from the bottom/inside of the glass and then down the firewall, under the carpet or floor mat, and to the floor. The way I usually hunt for these is to remove the floor mat or carpet then get a flashlight and lay down in the cab so you can see under the dash area while someone sprays water on the vehicle with a garden hose. Often the leak will show up as a trickle that you can then backtrack to it's source. Another spot to look for is at the cowl in front of the windshield where air for the heater and a/c is pulled into the passenger compartment. The water drain holes in this area can plug up and allow water to overflow into the passenger compartment. Good luck, hope this helps!
air conditioner/heater compressor's or evap canister is leaking on the floor. It is very common with the focus. After time that water begins to stink! Try silicone to seal the leaky component which would be above the floor mat.
It may be of 2 things. One thing you can look at is the evaporator part of your AC under the dash. It may have accumulated water in its coil that the excess flown towards the floor. Another are possible holes on the car's body. There could be a hole in the car's firewall that water from the drain may have flowed to the inside.
water from rainfall or water appearing on a dry day? if it's not rain it could be a cloged a/c evaporator drain. this might be hard to find. look for a clear hose (sometimes with a flap on the end) on the other side of dash (in the engine bay passanger side).
Sounds like the drain for your heater case is blocked, there is a small drain tube on the engine side of the firewall on the passenger side, you can shine a light down there and poke a screw diver in it or just pull the elbow right off and it should take care of it.