The Ministry of Ecology and Environment announced the national surface water environmental quality in the fourth quarter of 2023 and from January to December.

2025年8月28日 | admin | B2

On January 25th, the Ministry of Ecology and Environment announced to the media the national surface water environmental quality in the fourth quarter of 2023 (October-December) and January-December.

I. General situation

In the fourth quarter, among the 3,641 national surface water assessment sections, the proportion of sections with excellent water quality (Class I-III) was 89.8%, up 0.2 percentage points year-on-year; The proportion of inferior V section was 0.8%, up 0.1 percentage points year-on-year. The main pollution indicators are chemical oxygen demand, total phosphorus and permanganate index.

From January to December, among the surface water assessment sections in 3641 countries, the proportion of sections with excellent water quality (Class I-III) was 89.4%, up 1.5 percentage points year-on-year; The proportion of inferior V section was 0.7%, which was the same as that of the same period of last year. The main pollution indicators are chemical oxygen demand, total phosphorus and permanganate index.

Figure 1 Proportion of surface water quality categories in China from January to December

Second, the water quality of major rivers

In the fourth quarter, the proportion of sections with excellent water quality (Class I-III) in seven major river basins, such as Yangtze River, Yellow River, Pearl River, Songhua River, Huaihe River, Haihe River and Liaohe River, and rivers in the northwest, southwest and Zhejiang and Fujian provinces was 92.1%, up by 0.2 percentage points year-on-year; The proportion of inferior V section was 0.6%, up 0.2 percentage points year-on-year. The main pollution indicators are chemical oxygen demand, permanganate index and five-day biochemical oxygen demand. Among them, the water quality of the Yangtze River basin, the northwest rivers, the Zhejiang-Fujian rivers, the southwest rivers, the Pearl River and the Yellow River basin is excellent; The water quality of Huaihe River, Haihe River, Liaohe River and Songhua River basins is good.

From January to December, the proportion of sections with excellent water quality (Class I-III) in seven major river basins, such as the Yangtze River, Yellow River, Pearl River, Songhua River, Huaihe River, Haihe River and Liaohe River, and rivers in the northwest, southwest and Zhejiang and Fujian provinces was 91.7%, up 1.5 percentage points year-on-year; The proportion of inferior V section was 0.4%, which was the same as that of the same period of last year. The main pollution indicators are chemical oxygen demand, permanganate index and five-day biochemical oxygen demand. Among them, the water quality of the Yangtze River basin, Zhejiang and Fujian rivers, northwest rivers, southwest rivers, Pearl River and Yellow River basins is excellent; The water quality of Huaihe River, Liaohe River and Haihe River basins is good; Songhua river basin is slightly polluted.

Figure 2 Proportion of water quality categories in seven major river basins, southwest and northwest rivers and rivers in Zhejiang and Fujian from January to December.

Iii. Water quality and nutritional status of key lakes (reservoirs)

In the fourth quarter, among the 208 key lakes (reservoirs) monitored, the number of lakes and reservoirs with excellent water quality (Class I-III) accounted for 76.4%, up 2.8 percentage points year-on-year; The number of lakes and reservoirs with inferior grade V water quality accounted for 3.8%, down 1.0 percentage points year-on-year. The main pollution indicators are total phosphorus, chemical oxygen demand and permanganate index. Among the 201 lakes (reservoirs) whose nutritional status was monitored, 9 were moderately eutrophic, accounting for 4.5%; 46 were mildly eutrophic, accounting for 22.9%; The rest of the lakes (reservoirs) are in the state of medium nutrition or poor nutrition. Among them, Taihu Lake and Chaohu Lake are slightly polluted and slightly eutrophic, and the main pollution index is total phosphorus; Dianchi Lake is moderately polluted and moderately eutrophic, and the main pollution indexes are chemical oxygen demand, total phosphorus and permanganate index. Both Erhai Lake and Baiyangdian Lake have good water quality and moderate nutrition. The water quality of Danjiangkou Reservoir is excellent and moderate.

From January to December, among the 209 key lakes (reservoirs) monitored, the number of lakes and reservoirs with excellent water quality (Class I-III) accounted for 74.6%, up 0.8 percentage points year-on-year; The number of lakes and reservoirs with inferior grade V water quality accounted for 4.8%, which was flat year-on-year. The main pollution indicators are total phosphorus, chemical oxygen demand and permanganate index. Among the 205 lakes (reservoirs) monitoring the nutritional status, 8 are moderately eutrophic, accounting for 3.9%; 48 were mildly eutrophic, accounting for 23.4%; The rest of the lakes (reservoirs) are in the state of medium nutrition or poor nutrition. Among them, Taihu Lake and Chaohu Lake are slightly polluted and slightly eutrophic, and the main pollution index is total phosphorus; Dianchi Lake is slightly polluted and moderately eutrophic, and the main pollution indexes are chemical oxygen demand, total phosphorus and permanganate index. Both Erhai Lake and Baiyangdian Lake have good water quality and moderate nutrition. The water quality of Danjiangkou Reservoir is excellent and moderate.

Table 1 Water Quality and Nutritional Status of Six Lakes (Reservoirs) from January to December

Fig. 3 Water quality and nutritional status of six lakes (reservoirs) from January to December.

Four, prefecture level and above cities national surface water assessment section ranking

From January to December, among the cities at the prefecture level and above in China, the water environmental quality of national surface water assessment sections in 30 cities such as Liuzhou, Lishui and Chongzuo was relatively good (from 1st to 30th), while the water environmental quality of national surface water assessment sections in 30 cities such as wujiaqu city, Shangqiu and Kaifeng was relatively poor (from 1st to 30th). See Table 1-2.

The changes of water environmental quality of national surface water assessment sections in 30 cities such as Shihezi, Baicheng and Lvliang are relatively good (from 1st to 30th), while the changes of water environmental quality of national surface water assessment sections in 30 cities such as Benxi, Ningbo and Changzhou are relatively poor (from 1st to 30th). See attached table 3-4.

Schedule 1

From January to December, 2023, the water environment quality of the national surface water assessment section ranked the top 30 cities and their water bodies.

Schedule 2

From January to December, 2023, the water environment quality of the national surface water assessment section ranked the last 30 cities and their water bodies.

Note: The water quality of the water body marked with * in the table meets Class I or Class II of Environmental Quality Standard for Surface Water (GB3838-2002)Ⅰ); There is serious human interference in the section of Liutuan Bridge in Bailang River, Weifang City, and the worst value substitution treatment is carried out for this section.

Schedule 3

From January to December, 2023, the changes of water environment quality in the national surface water assessment section ranked the top 30 cities and their water bodies.

Note: A negative value indicates that the environmental quality of surface water is getting better year-on-year, while a positive value indicates that it is getting worse year-on-year, the same below.

Schedule 4

From January to December, 2023, the changes of water environment quality in the national surface water assessment section ranked the last 30 cities and their water bodies.

Note: The water quality of the water body marked with * in the table meets Class I or Class II of Environmental Quality Standard for Surface Water (GB3838-2002)Ⅰ); There is serious human interference in the sections of Sunjiawan and Langhekou of Guanshan River in Shiyan City and Sizaopu Gate in Ningbo City, and the worst value substitution treatment is carried out for the above three sections.