In 2020, among 112 selected key lakes across China, around 77 percent had been categorized with a water quality of Grade I to III, which serves mainly as drinking water and belongs to surface water source protection zone in China.
Key lake water quality on average in China in 2020, by quality
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Ministry of Ecology and Environment (China). (May 26, 2021). Key lake water quality on average in China in 2020, by quality [Graph]. In Statista. Retrieved August 15, 2022, from https://www.statista.com/statistics/1065068/china-distribution-of-water-quality-of-key-lakes-across-the-country/
Ministry of Ecology and Environment (China). "Key lake water quality on average in China in 2020, by quality." Chart. May 26, 2021. Statista. Accessed August 15, 2022. https://www.statista.com/statistics/1065068/china-distribution-of-water-quality-of-key-lakes-across-the-country/
Ministry of Ecology and Environment (China). (2021). Key lake water quality on average in China in 2020, by quality. Statista. Statista Inc.. Accessed: August 15, 2022. https://www.statista.com/statistics/1065068/china-distribution-of-water-quality-of-key-lakes-across-the-country/
Ministry of Ecology and Environment (China). "Key Lake Water Quality on Average in China in 2020, by Quality." Statista, Statista Inc., 26 May 2021, https://www.statista.com/statistics/1065068/china-distribution-of-water-quality-of-key-lakes-across-the-country/
Ministry of Ecology and Environment (China), Key lake water quality on average in China in 2020, by quality Statista, https://www.statista.com/statistics/1065068/china-distribution-of-water-quality-of-key-lakes-across-the-country/ (last visited August 15, 2022)