2008 Volvo C30 Water Leaks 

2010 C30 owner here, no sunroof and my left rear footwell is soaking in water as well, did you find out where it came from?

​@@mortjoer mine was all driverside and was the aircon drain that was blocked. If its passenger side I'd put money on it being the windscreen. If you push it from inside you should see the screen move

@@tipsandtricks5258 Hi, and thank you for answering. I think i found the cause to be the rear left hatch rubber bump stop. The interior is moist to the touch in the booth on the left side only and it runs and pools in the left rear foot well. The front left passanger footwell is dry as it seems. The left bump stop seems a bit loose compared to the right side one so it adds up in my mind at least ^^ Going to get a new one fitted tomorrow on both sides.