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.
Citation formats
Distribution of Songhua River Basin water in China 2021, by water quality
As of *************, around ** percent of the Songhua 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.
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Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). (April 7, 2021). Distribution of Songhua River Basin water in China as of February 2021, by water quality grade [Graph]. In Statista. Retrieved May 09, 2026, from https://www.statista.com/statistics/1065010/china-share-of-songhua-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). "Distribution of Songhua River Basin water in China as of February 2021, by water quality grade." Chart. April 7, 2021. Statista. Accessed May 09, 2026. https://www.statista.com/statistics/1065010/china-share-of-songhua-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). (2021). Distribution of Songhua River Basin water in China as of February 2021, by water quality grade. Statista. Statista Inc.. Accessed: May 09, 2026. https://www.statista.com/statistics/1065010/china-share-of-songhua-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). "Distribution of Songhua River Basin Water in China as of February 2021, by Water Quality Grade." Statista, Statista Inc., 7 Apr 2021, https://www.statista.com/statistics/1065010/china-share-of-songhua-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre), Distribution of Songhua River Basin water in China as of February 2021, by water quality grade Statista, https://www.statista.com/statistics/1065010/china-share-of-songhua-river-basin-water-by-quality/ (last visited May 09, 2026)
Distribution of Songhua 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/1065010/china-share-of-songhua-river-basin-water-by-quality/
