Status of secondary contamination of bottled drinking water and its influencing factors

[Objective]To understand the status of microbe secondary contamination of bottled drinking water in the use of drinking water supply apparatus and explore its influencing factors,and provide scientific basis for improving the sanitary status of drinking water supply apparatus to decrease secondary contamination.[Methods]A total of 79 ordinary drinking water supply apparatus in use were randomly sampled as the objects of bacteriological investigation,among them,19 drinking water supply apparatus had not been cleaned and another 13 drinking water supply apparatus had been cleaned,and their status of microbe contamination were tracked and observed.[Results] The contamination rates of the water that discharged from cold water valve of 79 drinking water supply apparatus for total bacterial count,mould + yeast and coliform group were 82.3%,34.2% and 10.1%,respectively.thermotolerant coliform bacteria and pathogenic bacteria were not detected.After cleaning,the contamination rates of bottled drinking water showed significant difference as compared with the same apparatus before cleaning(χ2 = 12.764,P 0.01).[Conclusion] The serious microbe secondary contamination of bottled drinking water that caused by drinking water supply apparatus in use still exists in Jiangmen City.It is very necessary to clean drinking water supply apparatus regularly and appropriately.