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