The karstic aquifers were the best source of potable water in the northeast of Rudbar, Iran. The present study was carried out to appraise the hydrogeological attributes of karst aquifer in this area. For this objective, saturation indices (SI values) are acquired through using the geochemical PHREEQC software for a number of chemical compounds existing in the karstic aquifer. Moreover, the sources of the ions and hydrogeochemical plots were obtained by using AqQA-RockWare software packages. The water type of all springs is the Ca-HCO 3 type which is determined by plotting of Piper diagram and Durov diagram for spring water samples, that is confirming the calcareous effects of the region on the quality of groundwater and representing a single source for the springs. The degree of Karstification of the recharge area of the karst aquifer was determined to be 5.5 from an analysis of the hydrograph Sefidab Spring. The microbial contamination can be observed in all samples due to the intense development of karst, lack of self-purification in the karst system, and lack of an adequate cover layer on carbonate formation.