Influencing factors of excessive microbe contents in rural drinking water

Objective To analyze the influencing factors of excessive microbe contents in rural drinking water in Jiangxi province and to provide evidence for policy making.Methods According to the results of microbe detection of 2 451 rural drinking water samples from 50 counties(cities,districts)of Jiangxi province in 2012,influences of different season,water source,scale of water supply facility,method of water processing and way of disinfection on microbe content in the water were analyzed.Results The exceeding standard rates of total number of colonies,total coliforms,and heat-resistant coliform bacteria were higher in wet season than that in dry season(21.87% vs 17.97%,55.45% vs 49.80%,and 42.43% vs 37.74%,respectively).The exceeding standard rate of total number of colonies was lower in surface water than that in ground water(17.61% vs 21.19%).The exceeding standard rates of total number of colonies and heat-resistant coliform bacteria were lower in large-scale faccilities than that in small facilities.(25.88% vs 54.63% and 19.44% vs 41.63%,respectively).The exceeding standard rates of total number of colonies(12.07% vs 24.32% and 9.15% vs 20.15%),total coliforms(20.64% vs 60.50% and 17.07% vs 60.50%),and heat-resistant coliform bacteria(13.79% vs 44.63% and 13.29% vs 50.42%)were lower in fully treated and disinfected water than that in filtered and untreated Water.The exceeding standard rates of total number of colonies,total coliforms and heat-resistant coliform bacteria were lower in the water disinfected with liquid chlorine than that disinfected with other disinfection methods.Conclusion Different season,type of water source,scale of water supply facility,method of water processing and way of disinfection are influencing factors of microbe content in rural drinking water.