As of July 2019, around 30.8 percent of the Liao River Basin water in China was categorized as Grade II, which serves mainly as drinking water and belongs to surface water source primarily in a protection zone in China.
Distribution of Liao River Basin water in China as of July 2019, by water quality grade
According to Surface Water Environment Quality Standards of China, the water quality is categorized as follows:
Grade I: source water and national nature reserve; Grade II: drinking water and surface water source primary protection zone; Grade III: drinking water and surface water source secondary protection zone; Grade IV: industrial water use and recreational water use; Grade V: agricultural and general landscape water use.
Low quality surface water refers to surface water below Grade V.
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Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). (August 19, 2019). Distribution of Liao River Basin water in China as of July 2019, by water quality grade [Graph]. In Statista. Retrieved June 04, 2020, from https://www.statista.com/statistics/1065021/china-share-of-liao-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). "Distribution of Liao River Basin water in China as of July 2019, by water quality grade." Chart. August 19, 2019. Statista. Accessed June 04, 2020. https://www.statista.com/statistics/1065021/china-share-of-liao-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). (2019). Distribution of Liao River Basin water in China as of July 2019, by water quality grade. Statista. Statista Inc.. Accessed: June 04, 2020. https://www.statista.com/statistics/1065021/china-share-of-liao-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). "Distribution of Liao River Basin Water in China as of July 2019, by Water Quality Grade." Statista, Statista Inc., 19 Aug 2019, https://www.statista.com/statistics/1065021/china-share-of-liao-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre), Distribution of Liao River Basin water in China as of July 2019, by water quality grade Statista, https://www.statista.com/statistics/1065021/china-share-of-liao-river-basin-water-by-quality/ (last visited June 04, 2020)
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