The present study was made to assess spatial and temporal variation in physico-chemical characteristics of Uppanar estuary for the period of one year from January 2014 - December 2014. Various parameters like temperature, pH, salinity, dissolved oxygen, biological oxygen demand, nitrite-nitrogen, nitrate-nitrogen, ammonical-nitrogen, total nitrogen, total phosphate and reactive silicate was studied and was noticed ranged between 23.1°C to 35.5°C, 6.1 to 8.6, 6.85 psu to 33.99 psu, 2.19 to 5.97 mg/l, 0.125 mg/l to 2.920 mg/l, 0.105 µmol/l to 3.458 µmol/l, 4.265 µmol/l to 27.635 µmol/l, 3.565 µmol/l to 26.235 µmol/l, 8.632 µmol/l to 74.202 µmol/l, 0.458 µmol/l to 13.525 µmol/l TP and 10.235 µmol/l to 103.265 µmol/l respectively. The concentrations of nitrate, ammonia, inorganic phosphate silicate level were very high at station 5. The results indicated that the water quality of the Uppanar River was moderately polluted might be due to the continuous discharge of municipal and industrial effluents situated in an around the river.
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