| This research applied the groundwater quality index (GWQI), principal component analysis (PCA) and cluster analysis (CA) for assessing pollution levels and factors effecting groundwater quality in Tan Thanh district, Ba Ria – Vung Tau province. Seventeen monitoring wells of Pleistocene aquifer were collected in April (dry season) and October (rainy season) during 5 years (2012-2017). Nine parameters of water (pH, total dissolved solid, total hardness, Chloride, Fluor, Nitrate, Sulfate, Cooper and Iron) were determined. According to GWQI, 17 monitoring sites have been classified as from good to very good. Two factors including (i) interaction of chemical components in aquatic sediments and (ii) character of aquifer and anthropogenic, affected to the quality of groundwater in the study area. In addition, CA divided data into 2 different groups, group 1 embrace wells with fresh water, group 2 consist of wells that tend to be saline intrusion, similar to groundwater quality in the group has high GWQI index, respectively. The study result provided specific information, and the useful tools in order to deal with the complicated databases, as well as zone the groundwater quality in the study area. This further help the authorities to plan suitable strategy for groundwater quality management.
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