INVESTIGATION ON THE QUALITY OF CENTRALIZED WATER SUPPLY IN RURAL AREAS OF MIANYANG IN 2009

[Objective]To understand the hygienic status of centralized water supply in rural areas of Mianyang city,and provide scientific foundations for the government to make health policy.[Methods]Hygienic investigation was conducted on the quality of the project of centralized water supply and the quality of water in rural areas of mianyang in 2009.[Results]136 projects of centralized water supply in rural areas were investigated.A total of 544 water samples were taken,and 211 were qualified.The qualified rate of water samples was 38.78%,and was 47.43% and 30.15% in dry and rain seasons,respectively.The qualified rate of total coli groud,thermostable coli groud and total colony was 49.08%,70.96% and 70.40%,respectively.The qualified rate of other index was all over 95%.The source of underground water was accounted for 73.53%,and surface water was accounted for 26.47%;The full treatment was accounted for 29.41%.Treatment with only disinfection was accounted for 50%,clarification and filtration were accounted for 13.97%,and the water supplied without any treatment was accounted for 6.62%.[Conclusion]The facilities for water treatment in project of centralized water supply were not well equipped,disinfection equipments were not well be used,the qualified rate of the water was low and microbiological contamination was severe,some comprehensive measures should be strengthen to inspect the management of drinking water in rural areas and water should be sterilized regularity.