Mad Water in Tank

ok i was investigating my other problem today and found lots of water in my tank. I havent evne drove that car hardly the past few weeks. what causes all this water and why isnt my water trap stopping it? i saw one diagram for the water trap to go from teh tank to the valves but i was thinking it should go from compressor to tank..i dunno but what could all this water be coming from. i dont drive in the rain or anything