Level one. Xuancheng sewage is treated by Xuancheng Xuanzhou Sewage Treatment Co., Ltd., which is mainly responsible for collecting and treating all industrial and domestic wastewater in the development zone, and then discharging it to natural water according to the first-class standard after treatment. Sewage discharge refers to the process of discharging domestic sewage, industrial wastewater, agricultural drainage and other water bodies containing harmful substances and pollutants into the natural environment.