Quality of finished water of rural water plants in Chongqing Municipality, 2015
ZHAO Yi-nan*, ZHONG Xiao-ni, XIANG Xin-zhi, LUO Shu-quan, WANG Zheng-hong, ZHOU Qian-ru, ZHOU Chun-bei
*School of Public Health and Management, Research Center for Medicine and Social Development, Innovation Center for Social Risk Governance in Health, Chongqing Medical University, Chongqing 400016, China
Abstract：Objective To comprehensively investigate the current situation of finished water quality of rural water plants in Chongqing Municipality in 2015, and to provide improvement measures and suggestions for rural drinking water safety. Methods A stratified random sampling method was used to select 846 water plants in 38 districts and counties in Chongqing Municipality, and their general situations were investigated. Finished water samples were collected in wet and dry seasons respectively, and then 20 indicators regarding the quality of finished water were detected and evaluated. Results A total of 1,691 water samples were monitored in 2015, of which the qualified rates in wet and dry seasons were 28.72% and 38.11% respectively (P<0.0001). The qualified rates of microbiological indicators, disinfectant residual indicators and turbidity indicator of the finished water samples were all less than 70%, but those of the other indicators were all higher than 90%. Under the same water season, the qualified rate was higher in river water than in other source water, higher in complete-treated water than in other-process-treated water as well as higher in water disinfected by chlorine dioxide than in water disinfected by other methods, with statistically significant differences (all P<0.05). Conclusions The qualified rate of finished water of rural water plants in Chongqing Municipality in 2015 was generally low. It is necessary to strengthen the standardized management of water plants with water supply capacity < 1,000 m3/d, increase the amount of disinfectant during wet season, add water disinfection facilities and use them in accordance with the requirements so as to avoid the epidemics or outbreaks of water-borne diseases.
2018, Vol. 25 
