[Chinese Mainland] GB 47945—2026 Discharge Standard of Water Pollutants for the Chishui River Basin, effective September 1: another example of a basin-specific discharge standard, with upgraded control in the core production area of sauce-flavor baijiu

Lead Summary: The GB 47945—2026 "Water Pollutant Discharge Standard for the Chishui River Basin" issued by the Ministry of Ecology and Environment officially came into effect on 2026年9月1日. This standard is issued for the first time, and specifies the main water pollutant discharge control requirements, monitoring requirements, and supervision and management requirements for pollutant discharging units and production facilities in key industries within the Chishui River Basin. Together with the "Main Water Pollutant Discharge Control Standard for the Danjiangkou Reservoir Area and Upstream" (GB 47946—2026) implemented on the same day, China's basin-type water pollutant discharge standard system has taken another step forward.

Standard Highlights: A Trinity of Control Requirements, Monitoring Requirements, and Regulatory Requirements

According to the standard information published by the Ministry of Ecology and Environment, the scope of application of GB 47945—2026 focuses on pollutant discharging units in key industries and production facilities within the Chishui River Basin, and its content framework consists of three parts:

• Water pollutant discharge control requirements — discharge control requirements are set for the main water pollutants of key industries and production facilities within the basin, constituting the core binding provisions of the standard;
• Monitoring requirements — the implementation specifications for pollutant discharging units in pollutant monitoring are clarified, providing a technical basis for compliance determination and enforcement evidence collection;
• Supervision and management requirements — the supervision and management mechanism for standard implementation is specified, connecting with pollutant discharge permits and routine enforcement.

The stated purpose of the standard is "to implement laws and regulations such as the Ecological Environment Code of the People's Republic of China, prevent and control pollution, improve ecological environment quality, and promote ecological environmental protection and high-quality development of the Chishui River Basin." It is worth noting that the standard information page clearly indicates that this standard is issued for the first time — this means that the Chishui River Basin previously had no dedicated basin-level water pollutant discharge standard, and relevant pollutant discharging units mainly implemented national industry-type or comprehensive discharge standards. Now there is a dedicated yardstick directly linked to the basin's environmental capacity.

Why the Chishui River: One River Carries a Hundred-Billion-Yuan Industry

The Chishui River is an important tributary of the upper Yangtze River. Due to the unique water quality, soil, and microbial environment within the basin, it has nurtured the core industrial belt of China's sauce-flavor baijiu, with large-scale brewing capacity concentrated along the river from Renhuai and Xishui to Gulin. Baijiu brewing is a typical industry generating high-concentration organic wastewater. Its wastewater is characterized by high COD concentration, highly variable biodegradability, and water volume that fluctuates significantly with the production cycle, and the characteristic pollutants in brewing wastewater are highly correlated with the sensitivity of the basin's water environment.

This places the formulation of discharge standards for the Chishui River Basin before a typical policy balancing problem: on the one hand, the basin's water environment quality is directly related to the quality foundation of sauce-flavor baijiu and the function of the upper Yangtze River ecological barrier, so protection requirements have high priority; on the other hand, stricter discharge standards will directly raise the wastewater treatment costs of brewing and related supporting enterprises, affecting regional industrial competitiveness. The value of basin-type standards lies precisely in shifting this balance from "one-size-fits-all industry limits" to "customized management matched to basin environmental objectives."

Basin-Type Standards: Discharge Management Moves from "Industry-General" to "One River, One Policy"

In the national water pollutant discharge standard system, the long-standing main lines have been industry-type standards (such as limits set by industry for textiles, papermaking, electroplating, etc.) and comprehensive standards (such as the "Integrated Wastewater Discharge Standard") running in parallel. In recent years, a clear change has emerged: formulating dedicated discharge standards for specific river basins and specific regions is becoming the new normal.

GB 47945—2026 and GB 47946—2026 (Danjiangkou Reservoir Area and Upstream), implemented in the same period, form a landmark combination — the two respectively target a tributary of the upper Yangtze River and the water source area of the South-to-North Water Diversion Middle Route Project, both belonging to basins that are ecologically sensitive with special functional positioning. The signal conveyed by this combination is clear:

• Standards are linked to basin functions — discharge requirements for water source areas, rare fish protection zones, and ecologically sensitive areas are no longer "set low rather than high," but instead limits are back-calculated according to basin environmental objectives;
• Standards connect with the Code — the formulation basis of multiple new standards explicitly incorporates the Ecological Environment Code of the People's Republic of China, making the legal foundation more rigid;
• Standards are combined with industrial characteristics — the regulatory targets of the Chishui River standard point to "pollutant discharging units in key industries and production facilities," which in essence recalibrates water pollutant control for characteristic industries such as brewing at the basin scale.

For pollutant discharging units, the implementation of basin-type standards means the dynamization of compliance benchmarks: the same industry may be subject to different discharge yardsticks in different basins, and enterprises' environmental protection facility design, process route selection, and operation management all need to be upgraded from "meeting industry national standards" to "meeting the dedicated requirements of the basin in which they are located."

What It Means for Enterprises: From End-of-Pipe Compliance to Whole-Process Control

The standard's three-part framework—emission control, monitoring, and supervision and management—in fact corresponds to the three stages of corporate compliance. Emission control requirements are the endpoint, monitoring requirements are the process trail, and supervision and management requirements are the external constraint. For key industry enterprises within the watershed, the focus of compliance work will undergo several substantive changes:

• Monitoring capability moved upstream—The inclusion of monitoring requirements in the standard means that enterprises must possess self-monitoring or commissioned monitoring capabilities that match the standard's requirements, and data quality and completeness will become a focus of enforcement;
• Pretreatment standards raised—When watershed limits are tightened, the design margin of enterprises' internal pretreatment facilities needs to be recalculated, and the Anaerobic pretreatment of high-concentration organic wastewater and the Denitrification and phosphorus removal process stages are often the first to bear the brunt;
• Reuse becomes a cost option—When emission constraints are tightened, the economic viability of advanced wastewater treatment and in-plant reuse improves accordingly, and Reclaimed Water Reuse shifts from an "environmental bonus point" to a "cost comparison benchmark."

In the course of long-term tracking of watershed governance policies, TIANYI TECH (TIANYI LIMITED) has observed that the shift of emission standards from the industry dimension to the watershed dimension is essentially making the scarce resource of "water environment capacity" explicit. For corporate clients, the earlier watershed standards are incorporated into the technical route assessment of environmental protection facilities, the better they can avoid passive retrofitting during the standard transition window. The solution consulting services we provide in the fields of wastewater treatment and Reclaimed Water Reuse are precisely centered on scenarios such as high-concentration organic wastewater treatment, advanced Denitrification and phosphorus removal, and Reclaimed Water Reuse, helping clients find a sustainable technical path between compliance and cost.

About TIANYI TECH: TIANYI TECH (TIANYI LIMITED) has long focused on frontier developments in global water environment governance and water resource recycling, and is deeply engaged in technical information and industry services in the fields of wastewater treatment and Reclaimed Water Reuse, committed to providing timely and professional industry observations and solution references for clients and industry partners.