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Valuation of groundwater chemistry and its related health hazards risk for humans is a prerequisite remedial measure for human health. The semi-urban region in southern India was selected to measure the groundwater quality and interpret the human health risk valuation with deference to different age groups of adults and children through oral intake and skin contact of elevated concentration of fluoride (F -) and nitrate (NO3 -) water in the absence of other alternatives. Water samples were collected from the semi-urban region for pre and post rainfall period and resolute its chemistry. However, Fconcentration ranges 0.28 -to 5.48 mgLand 0.21 -4.43 mgL -; and NO3concentration ranges 0.09 -to 897.28 mgLand 0.0 -to 606.10 mgLelevating the drinking standars of Fin 32% and 38% samples and of NO3in 62% and 38% during pre and post rainfall seasons respectively. The fluoridebearing minerals are the main sources of elevated concentration of Fand excessive use of nitrate fertilizers as the chief source of NO3concentration in the aquifer regime. Water Quality Index (WQI) ranged from 18.3-233 and 12.97-219.14; 20% and 22% showed poor water quality for pre and post rainfall seasons with WQI = >200. Piper plot suggests that 46% and 51% of samples signify carbonate water type (Ca 2+ -HCO 3  ), and 32% and 28% of groundwater samples show Ca 2+ + Na + + HCO3type water for pre and post rainfall seasons respectively. Gibb's plot suggests the dominance of water-rock interaction in the aquifer system. Further, the principal component analysis (PCA) supported the same factors contributing to the elevated concentration of Fand NO3in groundwater. The hazard quotient (HQ) through ingestion (HQing) and dermal (HQder) pathways of Fand NO3was observed higher than its acceptable limit of 1.0 for different age groups indicating the non-carcinogenic effect on human health and effective strategic measures to be implemented in the area for improvement of human health conditions.

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