In 2018, among 111 selected key lakes across China, around 30.6 percent had been categorized with a water quality of Grade II, which serves mainly as drinking water and belongs to surface water source primary protection zone in China.
Key lake water quality on average in China in 2018, 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 29, 2019). Key lake water quality on average in China in 2018, by quality [Graph]. In Statista. Retrieved July 13, 2020, 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 2018, by quality." Chart. May 29, 2019. Statista. Accessed July 13, 2020. https://www.statista.com/statistics/1065068/china-distribution-of-water-quality-of-key-lakes-across-the-country/
Ministry of Ecology and Environment (China). (2019). Key lake water quality on average in China in 2018, by quality. Statista. Statista Inc.. Accessed: July 13, 2020. 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 2018, by Quality." Statista, Statista Inc., 29 May 2019, 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 2018, by quality Statista, https://www.statista.com/statistics/1065068/china-distribution-of-water-quality-of-key-lakes-across-the-country/ (last visited July 13, 2020)
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