As of February 2021, around 29 percent of the Huai 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 Huai River Basin water in China as of February 2021, 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). (April 7, 2021). Distribution of Huai River Basin water in China as of February 2021, by water quality grade [Graph]. In Statista. Retrieved November 03, 2024, from https://www.statista.com/statistics/1065011/china-share-of-huai-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). "Distribution of Huai River Basin water in China as of February 2021, by water quality grade." Chart. April 7, 2021. Statista. Accessed November 03, 2024. https://www.statista.com/statistics/1065011/china-share-of-huai-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). (2021). Distribution of Huai River Basin water in China as of February 2021, by water quality grade. Statista. Statista Inc.. Accessed: November 03, 2024. https://www.statista.com/statistics/1065011/china-share-of-huai-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). "Distribution of Huai River Basin Water in China as of February 2021, by Water Quality Grade." Statista, Statista Inc., 7 Apr 2021, https://www.statista.com/statistics/1065011/china-share-of-huai-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre), Distribution of Huai River Basin water in China as of February 2021, by water quality grade Statista, https://www.statista.com/statistics/1065011/china-share-of-huai-river-basin-water-by-quality/ (last visited November 03, 2024)
Distribution of Huai River Basin water in China as of February 2021, by water quality grade [Graph], Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre), April 7, 2021. [Online]. Available: https://www.statista.com/statistics/1065011/china-share-of-huai-river-basin-water-by-quality/
