In order to explore the water environment quality and its change of centralized drinking water sources of a waterworks in Xiangtan City,based on the monthly water quality monitoring data from January 2013 to December 2019,the 18 indexes of Cr6+,As,Cd,chloroform,carbon tetrachloride,Pb,Hg,Cu,Zn,F,volatile phenol,CN,NH3-N,Fe,Mn,(NO3-),Se and petroleum were evaluated.Results showed that this waterworks was mainly polluted by volatile phenols,fecal coliform bacteria,Hg and TP.Their monthly average values exceed the water standard of ClassⅡwith a r...