The present study was investigated the physico-chemical characteristics along the coastal waters of Puthupattinam, Southeast coast of India. The atmospheric and surface water temperature was maximum of 35.4±1.43 and 33.1±1.69°C during the summer season and minimum of 30.3±1.78 and 29.7±1.29°C during post-monsoon season. The maximum turbidity was 6.98±1.23 NTU during monsoon season and minimum of 5.03±0.88 during summer season. The salinity and pH of the coastal waters showed maximum of 36.0±1.96ppt and 8.3±0.35 during summer season and minimum of 31.9±1.53 ppt and 7.7±0.33 during monsoon season. The ammonia level was maximum of 0.5±0.1 mg/l during summer season. The DO, BOD and COD level of the coastal waters showed the maximum of 7.02±0.54 mg/l during monsoon, 0.99±0.04 mg/l during premonsoon season and 89.3±1.21mg/l during summer season. The nitrate, nitrite, phosphate, silicate, total nitrogen and POC level of the coastal waters showed the maximum of 8.2±1.00, 1.7±0.20, 0.64±0.02, 7.3±0.40, 10.1±0.69 and 2.2±0.76 mg/l during monsoon season.
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