Water in rear passenger foot well

[Latician]

Noticed this last week that the rear passenger foot well is soaked. Car is parked on an incline rear lower that front and only happened since the rain started in last week so it's definitely getting in somewhere. Checked all door seals and no signs it's getting in there, no water anywhere else in car other than rear passenger footwell. From my limited knowledge it appears to have come in somewhere along the floor plan and soaked upwards through the soundproofing. Any ideas on where it's could be getting in please??? Thanks

[lukew1985]

Have you checked the boot seal aswell?