Evaluation on Eutrophic States of Drinking Water Resource from Reservoirs in Chongqing

The eutrophic state and water quality of 12 drinking water resources were evaluated by using the comprehensive nutritive index.The results show that the drinking water resources is polluted by nutritive salts and organic materials,and the values of CODMn、TN、TP and Chla were 1.79~8.13 mg/L,0.778~4.12 mg/L,0.013~0.067 mg/L and 2.99~212 mg/m3 respectively.The water quality of 6 built reservoirs is up to eutrophic level and the water quality of 2 building reservoirs and 4 building reservoirs is the slight eutrophic level and middle eutrophic level separatively.The water quality is mainly polluted by chemical fertilizer,poultry and animal culture,and aquatic culture.