The Impact is that if the oil from a car starts to leak it could eventually run-off into a nearby lake, river, sea, ocean and other bodies of water nearby. This causes water pollution, but that isn't the only thing that causes water pollution. Volcano eruptions could cause water pollution but that isn't our fault that the volcano erupts its a natural cause. Construction sites could cause water pollution because if they accidently spill paint when they are painting the houses it could run-off into a nearby pond, river or another body of water and cause water pollution. Even us leaving behind trash at beach could cause water pollution because our trash will end up in the water nearby and then it could hurt sea creatures that live in that lake, river or a different body of water. Also, garbage trucks dumping our trash onto a beach or somewhere near water can cause water pollution because there could be chemicals inside of the trash bags that had been put inside.