China Implements Stricter Textile Wastewater Regulations

China has introduced a significant update to its wastewater regulations for the textile industry, mandating that dyeing and finishing plants demonstrate that their treated effluent does not harm fish embryos. This new national standard, GB 4287-2026, came into effect on September 1, 2026, for new, rebuilt, and expanded facilities, while existing plants must comply by January 1, 2028.

The updated regulations, published by the Ministry of Ecology and Environment and the State Administration for Market Regulation, replace four earlier standards and extend coverage to include chemical fibre weaving and industrial textile products. The new requirements focus on fish egg toxicity testing alongside traditional chemical discharge limits, emphasizing the overall environmental impact of textile wastewater.

Under the new testing procedure, newly fertilized zebrafish embryos are exposed to diluted treated wastewater, with a survival rate of at least 90% required to meet the standards. Facilities with strict discharge permits must conduct these tests at least twice a year, while others must test annually.

Unlike conventional monitoring that assesses specific pollutants, whole-effluent toxicity testing evaluates the combined biological effects of treated wastewater. This approach can reveal harmful interactions between substances, although it does not pinpoint the source of contamination. Effective management of chemical inputs and wastewater treatment is essential for addressing potential issues.

Bluesign, a Swiss textile sustainability organization, has advocated for fish egg toxicity testing for over a decade and is now proposing to expand biological wastewater testing across various textile manufacturing operations. The organization emphasizes the importance of understanding wastewater management practices among suppliers for international brands sourcing textiles from China.