Extension of civilization and trade, the ecosystem is agony from pollution. Rivers, Soil, Air are affected by this extension strongly. Various indices are used to monitor this effect. The basic direction of this experimentation is the introduce novel water quality index(WQI) with fuzzy inference method. Physical, chemical, biological state of the water are key attributes used in water quality index. The proposed work is intended at evaluating the WQI for the undersoilwater of Jafrabad taluka, Dist Jalna. Jafrabad taluka is surrounded by Purna River. Agriculture Water, Drinking Water, Industry Water, Daily Need Water is supplied from undersoilwater resources. In agriculture field, used of fertilizer and pesticide is more so this source is affected. Output of experimentation is to recognize the undersoilwater probable sectors for drinking water through GIS.