2010 sport, Found a pool in my spare tire well with no indication as to where it coming in from. Any ideas?

 

Had that problem on my 2014 (canadian, same as 2013).

Water was getting in through the hatch rubber, like if the hatch was not touching the rubber at some places when closed. I lifted the rubber in the top portion, then placed some rubber plumbing tape on the metal seam, then reinstalled the rubber seal. Took about 15 minutes. Problem solved in my case.

Before that, I asked Honda to have a look at it, and they were unable to find anything. I found where it was coming from by checking where I saw water just after a heavy rain.

Hope for you it is something simple.

 

Thanks I'll look into that