Water quality status of Uppanar estuary was studied using various physico-chemical characteristics of one year (January 2016 to December 2016). Results indicate variation in the water temperature between 23.62°C to 31.05°C. Transparency ranged between 35.75 to 53.02 cm. pH value ranged between 7.72 to 8.42. Salinity varied between 17.27 to 26.27 ppt. The value of dissolved oxygen varied from 4.24 to 6.23 mg/L. The Calcium level fluctuated between 123.15 to 244.45 mg/L. Values of nitrate varied from 0.40 to 0.59 mg/L, while, values of ammonia ranged between 0.04 to 0.17 mg/L. respectively. In the present observation, eight various physico-chemical parameters of Uppanar esturine water samples were studied during the study period of January 2016 to December 2016.
