The data revealed considerable variation, including extreme values in water quality parameters between the study locations
and sites. Based on the level to which the parameters fell below or above the ASEAN Marine Water Quality Criteria (AMWQC) stan-dard, generally they can be considered to range from poor to good condition at Phuket, Phi Phi and Surin, respectively (Table 3). Phu-ket has the highest nutrient concentration and turbidity levels,while Surin has the lowest.