Water quality monitoring results analysis of rural drinking water safety projects in Shenyang,China,2016-2022
Objective To understand the sanitary condition and health risk factors of rural drinking water in Shenyang,China from 2016 to 2022,and to provide a scientific basis and technical support for the decision-making by relevant departments.Methods From 2016 to 2022,field surveys were conducted at 1910 monitoring sites in 9 townships in Shenyang,and rural drinking water samples were collected in dry and wet seasons.The water quality was tested in accordance with the Standard Examination Method for Drinking Water(GB/T 5750-2006)and the sanitation and safety were evaluated according to the Standards for Drinking Water Quality(GB 5749-2006).The chi-square test was used to compare the qualification rates among different groups.Results from 2016 to 2022,a total of 3 820 water samples were collected and tested,with an overall qualified rate of 85.73％(3 275/3 820).The qualified rate of water samples significantly increased from 67.46％in 2016 to 93.98％in 2022.Statistical differences were observed in the qualified rates among different years,hydrological periods(dry season and wet season),types of water samples and disinfection methods.The main unqualified indicators from 2016 to 2022 included turbidity(4.06％),manganese(3.82％),total coliforms(2.88％),visible foreign substances(1.44％),nitrates(1.41％),total bacterial counts(1.31％),iron(1.15％),and color(1.10％).Conclusion The quality of drinking water in rural areas of Shenyang has been improved gradually from 2016 to 2022.It is necessary to pay special attention to the indicators failing to reach the standards,such as nitrate nitrogen,fluoride,iron,ammonia nitrogen,manganese,turbidity,visible matter,and attach importance to the potential health risks,thus ensuring the sanitation and safety of drinking water in the rural areas.
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