Groundwater quality mapping of Yogyakarta City, Sleman, Kulonprogo and Bantul regency area of Yogyakarta Province

The groundwater quality is equally important as that of quantity. GIS is a powerful tool for representation and analysis of spatial information related to water resources. To attempt this goal, samples were analyzed for various physico-chemical and bacterial parameters such as pH, Electrical Conductivity (EC), nitrate, Fe, E. coli, etc have been estimated for all the sampling locations. The spatial variation maps of these groundwater quality parameters were derived and integrated through GIS. An interpolation technique inverse distance weighting was used to obtain the spatial distribution of groundwater quality parameters. The final map classified the groundwater quality in the study area. The results of this research show that groundwater contamination are occurred and the development of the management strategies for the aquifer system is vitally necessary.