Objective To explore the pollution characteristics of Pseudomonas aeruginosa in packaged drinking water. Methods The detection of Pseudomonas aeruginosa in packaged drinking water sold in the province and produced by local enterprises during the supervision and sampling of Hunan Province from 2022 to 2024 was analyzed. Results The detection rate of Pseudomonas aeruginosa in 3 years was 8.15%, which significantly decreased to 5.74% in 2024 due to strengthened supervision. Other drinking water (9.44%) and sealed packaging (8.65%) had the highest risk. Summer and autumn (11.34% in the third quarter) and areas such as Changde and Xiangxi (over 15%) were high-risk areas for pollution. Conclusion Focusing on strengthening the prevention and control of bacterial protective films in water sources, optimizing seasonal processes and regulating high-risk areas can effectively reduce the pollution of Pseudomonas aeruginosa, thereby improving the sampling pass rate of packaged drinking water products. The research results provide key data support for the quality and safety of packaged drinking water in Hunan Province. The multiple risk superposition mechanism of “climate process management” revealed has practical guidance significance for the prevention and control of food microorganisms in humid and hot regions of Southern China.