Objective To understand the efficiency of depurating techniques and equipments in the barreled water factories. Methods According to the related standards, GB50073-2001, JGJ71-1990 and GB/T 16294-1996, the air quality of the filling rooms in barreled water factories in Chongqing was investigated. Results The rates of exceed limits in suspend particles and bacteria were 17.4% and 5.8%, in relative humidity, illumination and noise were 94.2%, 95.3% and 98.8% respectively. Conclusion There are some problems to be resolved in ensuring the cleanliness of filling rooms. The design standard of the barreled water factories should strictly accord to the requirements of QS authentication.