| 主要水系 | 监测断面 | 分类水质断面占全部断面百分比(%) | ||||||
| 个数(个) | Proportion of Monitored Section Water Quality (%) | |||||||
| Main Water | Number of | Ⅰ类 | Ⅱ类 | Ⅲ类 | Ⅳ类 | Ⅴ类 | 劣Ⅴ类 | |
| System | Monitoring | GradeⅠ | GradeⅡ | Grade Ⅲ | Grade Ⅳ | Grade Ⅴ | Worse | |
| Sections | than | |||||||
| (unit) | GradeⅤ | |||||||
| 长 江 | Changjiang River | 159 | 4.4 | 51.0 | 32.7 | 6.9 | 1.9 | 3.1 |
| 黄 河 | Huanghe River | 62 | 1.6 | 33.9 | 24.2 | 19.3 | 8.1 | 12.9 |
| 珠 江 | Zhujiang River | 54 | 5.5 | 74.1 | 14.8 | 1.9 | 3.7 | |
| 松花江 | Songhuajiang River | 87 | 6.9 | 55.2 | 28.7 | 4.6 | 4.6 | |
| 淮 河 | Huanhe River | 94 | 7.5 | 48.9 | 21.3 | 7.4 | 14.9 | |
| 海 河 | Haihe River | 64 | 4.7 | 14.1 | 20.3 | 14.1 | 9.3 | 37.5 |
| 辽 河 | Liaohe River | 55 | 1.8 | 34.5 | 5.5 | 40.0 | 10.9 | 7.3 |
| 资料来源：环境保护部。 | ||||||||
| Source: Ministry of Environmental Protection. | ||||||||
