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Evaluation and assessment of drinking water quality index (DWQI) of aquifer water in Thirukkazhukundram block are done in this paper. Thirty groundwater samples from open and Bore wells were collected and analyzed for premonsoon (PRM 2016 August) and post-monsoon (POM 2017 February) physicochemical tests using APHA procedures. DWQI was calculated by giving weightage to pH,EC,TDS,TH,Ca,Mg,Na,K,HCO3,Cl,SO4.From this DWQI workout, we get to know that during PRM and POM all the places of sample collection are categorized to be fit for the drinking category from medium to excellent. The positive correlation between various ion pairs obtained from SPSS software for PRM and POM major ions respectively is due to chemical weathering, leaching of salts, and anthropogenic factors. Thus, proper planning and management of pollution-free groundwater could be propelled to upgrade the medium category groundwater too.

EVALUATION AND ESTIMATION OF DRINKING WATER QUALITY INDEX IN THIRUKKAZHUKUNDRAM BLOCK, TAMIL NADU, INDIA