The Republic of South Korea, the country which is one of the developed counties in the world, confronts with the pollution problems which occur because of human action and manufactures. The water pollution has become the major problem in the last few decades. It affects a lot of population in terms of industry, agriculture and tourism. Therefore, this water pollution is increasing an obstacle that retards the country development. The objective of this paper is to discuss about the real occurrences in South Korea which are water pollution in 3 Korean cities namely Seoul, Busan and Ulsan.