简介：Waterpollutionisoneofthemajorenvironmentalproblems,especiallyinurbanareas.Duetorapidurbanexpansionandindustrialization,waterpollutioninZhengzhouCity,thecapitalofHenanProvinceincentralChinahasbecomeaseriousproblemforitsdevelopment.Inthisstudy,thesurfacewaterqualitywasevaluatedusingNemerowComprehensivePollutionIndex(NCPI),andthechangetrendwascalculatedusingmethodsofMann-KendalltestandSen’sslopeestimator,basedonthemonitoringdatafrom1998to2008.TheresultsshowthattheNCPIrangedfrom3to50in70%ofthemonitoringcases,implyingthatmostriverswereseriouslypolluted.However,thisseriouspolltuonisexpectedtobegraduallyimproved,astheconcentrationofwaterpollutantsandNCPIdeclinedsignificantlyinmostrivers.Waterpollutioninreservoirswasmuchlowerthanrivers,andtheNCPIinthethreemonitoredreservoirswaslowerthan3inmostyears,andshowsadownwardtrend.Althoughthesurfacewaterqualitywasgraduallyimproved,greateffortsarestillneededtoenhancetheprotectionandimprovementofsurfacewaterenvironment.