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China's GB 4287-2026 standard requires certain dyeing and finishing facilities to pass a fish embryo toxicity test on treated wastewater, effective Sept. 1 for new facilities and Jan. 1, 2028 for existing ones.
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The country’s new textile discharge standard adds a requirement for certain dyeing and finishing operations to demonstrate that fish embryos can survive exposure to their treated wastewater, introducing a biological check alongside existing chemical limits.. The standard, GB 4287-2026, took effect Sept. 1 for new, rebuilt and expanded facilities. Existing facilities must comply from Jan. 1, 2028, though provincial governments may approve an earlier rollout. Published jointly by China’s Ministry of Ecology and Environment and the State Administration for Market Regulation, it replaces four 2012 standards covering dyeing and finishing, silk reeling, wool and hemp.. The test uses newly fertilized zebrafish eggs exposed for 48 hours to a sample diluted to one-sixth of the test solution. At least 90 percent must survive at approximately 79 degrees Fahrenheit, according to the standard.
First public verification: Not reported