Recently, the Ministry of Ecology and Environment and the State Administration of Market Supervision and Administration jointly issued the "Danjiangkou Reservoir Area and Upstream Major Water Pollutants (Total Antimony, Total Molybdenum, etc.) Emission Control Standards (Trial)" (GB 47946-2026)(hereinafter referred to as "Danjiangkou Standard").

　　Danjiangkou Reservoir is the water source of the middle route of the South-to-North Water Transfer Project, which plays an important role in the optimal allocation of national water resources and inter-basin water transfer strategy. At present, the standards implemented by the main emission sources in the basin are not uniform, the control of total molybdenum and total antimony is insufficient, and the non-point source emissions in the basin account for a relatively high proportion but lack of targeted control requirements. In order to solve the above problems, further enhance the systematic and scientific nature of river basin governance, build a river basin governance system of "upstream and downstream linkage, left and right shore co-governance, and a game of chess in the whole region", and formulate the "Danjiangkou Standard".

　　"Danjiangkou standard" is the first river basin type emission standard issued in the form of national standard, which fills the gap of national unified emission standard for inter provincial river basins. The standard adheres to the principle of "one river basin, one set of standards and one ruler", realizes the unified discharge scale, unified control rules and unified law enforcement bottom line of all administrative regions in the river basin, and breaks the barriers of administrative division to water environment governance. It is an important innovation to promote the prevention and control of water pollution in key river basins, It is of great significance to promote the construction of ecological environment governance system integrating upstream and downstream in important river basins.

　　In terms of control requirements, the standard focuses on three key points: first, in view of the loose emission limits implemented by centralized sewage treatment facilities in some cities and towns, the corresponding emission limits are tightened; The second is to improve the total molybdenum and antimony emission control requirements of molybdenum industry and antimony industry, promote pollutant emission reduction and strengthen the prevention of environmental risks such as heavy metals. The third is to make up for the short board of non-point source control and clarify the control requirements for various non-point source emission sources, in view of the collection and treatment of antimony-containing non-point source sewage, it is proposed that the local overall consideration of the distance between the mining area and the water source area, river water volume and other factors, according to the total antimony control target of the section to reasonably determine the total antimony emission concentration limit of the treatment facilities, at the same time, based on the water quality standard calculation recommended bottom limit.

　　The "Danjiangkou Standard" embodies the work policy of precise pollution control, scientific pollution control, and pollution control according to law. It is an innovative measure to promote the coordinated protection of the upper and lower reaches of the river basin and the left and right banks. It is important to improve the accuracy of river basin governance, support the continuous improvement of water quality, and ensure the middle route of the South-to-North Water Transfer Project. Water source safety is of great significance.