85.
The centralized treatment rate of urban domestic sewage shall be no less than 85%. The calculation formula is: centralized treatment rate of urban domestic sewage = urban domestic sewage treatment volume (10,000 tons)/total urban domestic sewage discharge (10,000 tons) × 100.
The daily operation of cities produces a large amount of sewage, including domestic sewage, industrial wastewater, rainwater runoff, etc. This sewage should be effectively treated rather than discharged directly to avoid causing water pollution, exacerbating water shortages, and promoting sustainable urban economic and social development.