The present study aims to analyze the monthly variations of heavy metals like Cu, Cd, Zn and Pb in water and sediment samples collected from Cuddalore coast during January to December 2011. The result showed that the accumulation of heavy metals in sediments was higher than the water due to the metal sink in sediment as well as the fresh water runoff. The Cuddalore coast receives the waste from SIPCOT industries, municipal wastes, mining wastes, aquaculture and agricultural discharges are the sources to pollute the study area. The availability of metals in water samples increased in the order: Cu