Water in rear floorboard?

I have looked all around the door to see if there is an area where water is coming in and I don't see anything, also there doesn't seem to be any other area that is wet, rear seat, any area on the door, etc. I am going to take to the dealership this week and see if they can figure it out.
 

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@Heen56 I just read this CX-5 thread and I wonder if it's related to your problem...Could it be that you have a blocked drain?
 
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Another place to check would be the seal around the taillights. This is a common area for water leaks on the Miata.
 
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