Analysis of Microbial Indexes in Peripheral Water of Rural Centralized Water Supply in Hunan Province

Objective To investigate the microbial contamination of rural centralized water supply and explore efficient preventive measures,so as to provide a basis for the improvement of water quality of rural centralized water supply.Methods The drinking water quality of 2,006 centralized water supply points in rural areas of 93 counties(districts) in Hunan Province in 2011 was monitored according to the relevant national standards of water quality testing.The microbial indicators of samples in different conditions were analyzed statistically.Results The total qualified rate of microbial indicators in 4,012 peripheral water samples of rural centralized water supply was 40.28%.The microbial indicators showed statistically significant difference among centralized water supplies with different water treatment processes as well as various water source types(P0.001).The water quality in the dry season was better than that in the wet season(P0.001).The total number of colonies was positively correlated with turbidity.Conclusions The total qualified rate of microbial indicators in peripheral water of rural centralized water supply is related to the factors like water treatment process and water source types.It suggests that to improve the quality of rural centralized water supply,water treatment should be integrated,sanitary management of water factory should be strengthened,water source protection should be promoted,and health education should be popularized in rural areas.