The study aims for the quantitative assessment of chlorophyll concentration and their distribution in the coastal waters of  Kalpakkam (Tamil Nadu, India) using the normalised water leaving radiance from the OCEANSAT-2 Ocean Colour Monitor (OCM-2) with in situ chlorophyll concentration. The site specific regional algorithm is based on the sigmoid relationship of the band ratio (nL_w490/nL_w555) and generates a polynomial relation. The validation of chlorophyll concentration yields a high correlation (r²=0.92) with 21 independent in situ samples. The study demonstrated the application potential of OCM-2 in assessing the biological conditions of coastal waters. The chlorophyll distribution predominates towards north depending on the local climatic conditions.