Abstract: ObjectiveTo analyze hygienic quality of drinking water in Jinzhou municipality of Liaoning province before and after a routine hygienic supervision.MethodsWith random sampling,we collected 105 and 180 drinking water samples before and after a supervision at 46 secondary water supply units,2 self-built water plants and two public water plants between May 2015 and May 2016.Hygienic quality of the water samples was detected and compared to assess the effect of the supervision process.ResultsAfter the implementation of the quantitative supervision,the qualification rate of peripheral water (81.74%,106/130) and output water (98.00%,49/50) increased significantly compared to those before the supervision (both P<0.05) and the proportion of water supply capablility improvement increased from 70.00% to 95.00% significantly among the water supply units surveyed (P<0.05).ConclusionStrengthening routine hygienic supervision on water supply facilities is helpful to ensure hygienic quality of public drinking water supplied by the facilities.