In 2020, around 52 percent of the river water samples across China had been categorized as Grade II, which serves mainly as drinking water and belongs to surface water source primary protection zone in China.
Average river water quality in China in 2019 and 2020, by quality
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; Grad IV: Industrial water use and recreational water use; Grade V: Agricultural water use and General landscape requirements.
Low quality surface water refers to surface water worse than Grade V.
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Ministry of Ecology and Environment (China). (May 26, 2021). Average river water quality in China in 2019 and 2020, by quality [Graph]. In Statista. Retrieved May 26, 2022, from https://www.statista.com/statistics/1065058/china-share-of-river-water-quality-across-the-country/
Ministry of Ecology and Environment (China). "Average river water quality in China in 2019 and 2020, by quality." Chart. May 26, 2021. Statista. Accessed May 26, 2022. https://www.statista.com/statistics/1065058/china-share-of-river-water-quality-across-the-country/
Ministry of Ecology and Environment (China). (2021). Average river water quality in China in 2019 and 2020, by quality. Statista. Statista Inc.. Accessed: May 26, 2022. https://www.statista.com/statistics/1065058/china-share-of-river-water-quality-across-the-country/
Ministry of Ecology and Environment (China). "Average River Water Quality in China in 2019 and 2020, by Quality." Statista, Statista Inc., 26 May 2021, https://www.statista.com/statistics/1065058/china-share-of-river-water-quality-across-the-country/
Ministry of Ecology and Environment (China), Average river water quality in China in 2019 and 2020, by quality Statista, https://www.statista.com/statistics/1065058/china-share-of-river-water-quality-across-the-country/ (last visited May 26, 2022)
