This dataset represents the average level of conventional treatment at Shanghai water treatment plants, covering the whole-process production activities of tap water from raw water intake to plant effluent, specifically including conventional treatment units such as water intake, coagulation and sedimentation, filtration, disinfection, water storage and water transmission. The dataset focuses on recording the use of chemicals such as coagulants, disinfectants and sludge treatment agents, as well as related contents such as electricity consumption and the construction and maintenance of the water plant. The data are sourced from statistical yearbooks.