Water in passenger footwell

water is coming into the passenger footwell from the Pollen filter housing. The filter gets wet for about the bottom inch or so.The scuttle tray and drains from from the engine bay are clear and dry and I cant see where water can get into the vent system. The vent fan and fresh air inlet are dry so its not coming in through there. is there any where else the water could get into the pollen filter housing? Its not the heater matrix as the water level in the system never drops or changes. the car has a sunroof but the seals are good with no sign of leaking and the drains are clear.