This paper reviews on the water quality for Carey Island which is one of the mangrove islands in Malaysia. The mangrove area has vital functions of its mangrove tress. In order to control and protect the level of contamination at this area, a study on water quality has been carried out. Three rivers that selected as a point of study are Air Hitam, Judah and Keluang River. The parameters tested for the water quality are Temperature, pH, Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Turbidity, Total Suspended Solid (TSS), Total Organic Carbon (TOC) and Ammoniacal Nitrogen (NH 3 -N). The parameters were tested by in-situ and laboratory testing. Finally, it is found that the Air Hitam, Judah and Keluang rivers are experiencing contamination and pollution problems. Water Quality Index calculation shows that all the rivers fall under Class III River category. Air Hitam River has the worst quality followed by Keluang River and Judah River