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An investigation is carried out to analyze the underground water quality of 26 villages in Bapatla mandal for their quality parameters and comprehensively arriving at a single water quality index. The irrigation water samples were collected manually from the bore wells which are approximately equally distributed all over 26 villages of Bapatla mandal. The samples were analyzed using standard procedures in the laboratory (APHA, 1985). The parameters analyzed during the analysis are pH, EC, Chlorides, Calcium, Magnesium (Mg), Total Dissolved Solids (TDS), Total Hardness (TH). The final output has been given in the thematic representation of irrigation water quality attributes using SURFER 7.0 for individual as well as weighted Water Quality Index. From the investigation, it is clearly evident that the groundwater of the area needs some degree of treatment before consumption. Based on the investigations carried out, it is observed that Asodivaripalem, West Bapatla, Cheruvujamulapalem, Murukondapadu, Muthayapalem, Maruproluvaripalem and Vodarevu villages contain water quality very poor for irrigation purpose due to over salt accumulation. Necessary measures are to be taken to gain safe irrigation and drinking water to the people living in the villages. Total hardness was found to be very high in Murukondapadu, and Muthayapalem villages. Very high concentrations of chloride, calcium and magnesium were found in West Bapatla, Cheruvujamulapalem, Murukondapadu and Muthayapalem villages. The water quality is good in Jillelamudi,