As of February 2021, around 44 percent of the surface water in China had been categorized as Grade II, which serves mainly as drinking water and belongs to surface water source primary protection zone in China.
Distribution of surface water in China as of February 2021, by water quality
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Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). (April 7, 2021). Distribution of surface water in China as of February 2021, by water quality [Graph]. In Statista. Retrieved July 06, 2022, from https://www.statista.com/statistics/1064877/china-share-of-surface-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). "Distribution of surface water in China as of February 2021, by water quality." Chart. April 7, 2021. Statista. Accessed July 06, 2022. https://www.statista.com/statistics/1064877/china-share-of-surface-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). (2021). Distribution of surface water in China as of February 2021, by water quality. Statista. Statista Inc.. Accessed: July 06, 2022. https://www.statista.com/statistics/1064877/china-share-of-surface-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). "Distribution of Surface Water in China as of February 2021, by Water Quality." Statista, Statista Inc., 7 Apr 2021, https://www.statista.com/statistics/1064877/china-share-of-surface-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre), Distribution of surface water in China as of February 2021, by water quality Statista, https://www.statista.com/statistics/1064877/china-share-of-surface-water-by-quality/ (last visited July 06, 2022)