This article delineates the agricultural water quality in the surrounding areas of Vellore district of Tamil Nadu by determining the sodium adsorption ratio, iron concentration and most probable number. The sodium adsorption ratio values of all water samples collected from the surrounding villages of the Vellore district were compared with the standard FAO values to ascertain the salinity of water. The concentration of calcium, magnesium and iron were also determined to evaluate the quality of water. A Most Probable Number analysis was conducted to determine the presence of Escherichia coli in the water used for irrigation. All the parameters tested for water quality analysis were found to fall within the acceptable range rendering the water suitable for the purpose of irrigation.