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 Liao River Basin water in China 2021, by water quality
As of ***, around ** percent of the Liao 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 Liao River Basin water in China as of February 2021, by water quality grade [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 27, 2026, from /statistics/1065021/china-share-of-liao-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). "Distribution of Liao River Basin water in China as of February 2021, by water quality grade." Chart. April 7, 2021. ÌÇÐÄÆƽâ°æ. Accessed July 27, 2026. /statistics/1065021/china-share-of-liao-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). (2021). Distribution of Liao River Basin water in China as of February 2021, by water quality grade. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 27, 2026. /statistics/1065021/china-share-of-liao-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre). "Distribution of Liao River Basin Water in China as of February 2021, by Water Quality Grade." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 7 Apr 2021, /statistics/1065021/china-share-of-liao-river-basin-water-by-quality/
Ministry of Ecology and Environment (China) (China National Environmental Monitoring Centre), Distribution of Liao River Basin water in China as of February 2021, by water quality grade ÌÇÐÄÆƽâ°æ, /statistics/1065021/china-share-of-liao-river-basin-water-by-quality/ (last visited July 27, 2026)
Distribution of Liao 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: /statistics/1065021/china-share-of-liao-river-basin-water-by-quality/
