The two companies (Haoyuan Chemical Company and Taolin Lead-Zinc Ore Chemical Plant) that are thought to be responsible for the arsenide pollution of the Xinqiang river have been reportedly detained. (Xinhua 9/11) According to the Xinhua report,
"The two companies had not passed any environmental assessments and had no pollution treatment facilities. They have been discharging waste water with arsenide content more than 1,000 times higher than the national standard directly into Xinqiang River for a long time, said the official.
Haoyuan Chemical Company discharged nearly 50,000 tons of wastewater every month, and Taolin Lead-Zinc Ore Chemical Plant 280 tons, [a SEPA official] said, without revealing over what time period."