2010 m35 Back passenger side floor keeps getting water

[Alffie]

Did anyone else have this problem? We had some heavy rain a few months ago and I drove thru some deep standing water, i thought maybe that's why. Took out the carpet so it can dry. Now today Its raining a lot and I didnt drive thru any standing water, but some how the carpet is wet. Seems like that the only part that gets soaked. Everywhere else is dry including headliner.
And suggestions or solutions? This is starting to get annoying

This was the first time

[EdBwoy]

Man, that's a lot of water.

Since you are comfortable removing the carpet, I would remove the A and C pillar trim pieces to make sure the front & rear sunroof drains are functioning properly.

[Alffie]

Tell me about it. Ok will try that. Doesnt help that I mostly park under a tree.