Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 ChinaCollege of Resources and Environment University of Chinese Academy of Sciences Beijing 100049 China;
Research Institute for Environmental Innovation(Suzhou) Tsinghua Suzhou 215163 China;
College of Environment&Ecology Xiamen University Xiamen 361102 China;
School of Environment Tsinghua University Beijing 100084 China;
Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 ChinaCollege of Environment&Ecology Xiamen University Xiamen 361102 China;
Department of Environmental Science and Engineering College of Chemical Engineering Huaqiao University Xiamen 361021 China;
Drinking water biosafety; Water source switching; Drinking water distribution system; Transition effects; High-throughput sequencing;