The present study was carried out to determine the physico-chemical characteristics and heavy metals in Ennore - back water and Manali - CPCL (Chennai Petroleum Corporation Limited) for groundwater during six month (January 2017-June 2017). The water quality parameters were then compared with the quality standards. The water quality standards are vital for marine biota. Regular monitoring and assessment of these parameters will therefore maintain the dignity and social value of Ennore creek. The increased prominence of the petroleum industry in Manali has given rise to a concomitant upsurge of ecological disturbances together with groundwater pollution. Samples were collected monthly in the morning during low tide in Ennore and in the evening at CPCL to determine the important physico chemical parameters viz. turbidity, Electrical Conductivity (EC), Total Solids (TS), Total Dissolved Solids (TDS), salinity, pH, Dissolved Oxygen (DO), Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), calcium, chloride, sodium, potassium and nutrients like nitrate, nitrite, silicate and phosphate. It is attributed due to the constricted outlet of the creek and large scale inflow of pollutants due to precipitation. Further the factor analysis indicates that the parameters responsible for water quality variations are mainly related to the influence of municipal sewage, agricultural effluents and industrial waste water in back water and in ground water as well.
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