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Hydrogeochemical studies were carried out in and around Udayagiri area of Andhra Pradesh in order to assess the chemistry of the groundwater and to identify the dominant hydrogeochemical processes and mechanisms responsible for the evolution of the chemical composition of the groundwater. Descriptive statistics, correlation matrices, principal component analysis (PCA), together with cluster analysis (CA) were used to gain an understanding of the hydrogeochemical processes in the study area. PCA has identified 4 main processes influencing the groundwater chemistry viz., mineral precipitation and dissolution, seawater intrusion, cation exchange, and carbonate balance. Further, three clusters C1, C2 and C3 were obtained. Samples from C1 contain high level of Cl− and may be due to the intensive evaporation and contamination from landfill leachate. Most of the samples from C2 are located closer to the sea and the high level of Na+ +K+ in these samples may be attributed to seawater intrusion. The geochemistry of water samples in C3 are more likely to originate from rock weathering. This has been supported by Gibbs diagram. The groundwater geochemistry in the study area is mostly of natural origin, but is influenced to some degree by human activity.  Evaluacion de la calidad del agua subterranea a traves de tecnicas estadisticas multivariadas en el area Udayagiri, distrito Nellore, Andhra Pradesh, en el sur de India Resumen Se realizaron estudios hidrogeoquimicos en y alrededor del area Udayagiri de Andhra Pradesh para evaluar la quimica del agua subterranea e identificar los procesos hidrogeoquimicos dominantes y los mecanismos responsables de la evolucion en la composicion quimica del agua subterranea. Se utilizaron estadisticas descriptivas, matrices de correlacion, analisis de componentes principales, al igual que analisis de grupos, para obtener y entender los procesos hidrogeoquimicos en el area de estudio. Los analisis de componentes principales identificaron cuatro procesos determinantes que influenciaron la quimica del agua subterranea, estos son, la precipitacion y disolucion de minerales, l intrusion de agua marina, el intercambio de cationes y el equilibrio de carbonatos. De esta forma se obtuvieron tres grupos, C1, C2, y C3. Las muestras del grupo C1 contienen un alto nivel de Cl- , lo que podria deberse a la intensa evaporacion y contaminacion de los lixiviados de rellenos sanitarios. Muchas de las muestras del grupo C2 se ubican cerca del mar y el alto nivel de Na++K+ podria atriburise a la intrusion de agua marina. La geoquimica de las muestras de agua en el grupo C3 probablemente se desprende de la meteorizacion de rocas. El diagrama de Gibbs valida estos resultados. La geoquimica del agua subterranea en el area de estudio es principalmente de origen natural pero tambien esta influenciado por la actividad humana en algun grado.

Assessment of Groundwater Quality of Udayagiri area, Nellore District, Andhra Pradesh, South India Using Multivariate Statistical Techniques