In today's world, it has become necessary to deal with problems regarding water resources through studies to be conducted on a local even basin basis. In this study, considering the water quality as the limiting factor for the Ergene Basin, we have considered it necessary to make an analysis of the change of the current water quality by years in the basin, designed and stored in computer environment an environmental data base including information, such as topography, administrative boundaries, settlement areas streams, polluting facilities, forest cover of the basin in the form of a geographic information system in order to display the current situation of the basin in computer environment, and aimed to identify the classification of the water quality by using a software package (MapInfo) on data
