| 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 | 160 | 2.5 | 51.3 | 32.5 | 6.9 | 2.5 | 4.4 |
| 黄 河 | Huanghe River | 61 | 29.5 | 31.1 | 9.8 | 11.5 | 18.0 | |
| 珠 江 | Zhujiang River | 54 | 1.9 | 74.1 | 14.8 | 5.6 | 3.7 | |
| 松花江 | Songhuajiang River | 88 | 8.0 | 51.1 | 26.1 | 9.1 | 5.7 | |
| 淮 河 | Huanhe River | 95 | 5.3 | 42.1 | 30.5 | 4.2 | 17.9 | |
| 海 河 | Haihe River | 64 | 1.6 | 18.8 | 18.8 | 14.1 | 14.1 | 32.8 |
| 辽 河 | Liaohe River | 55 | 3.6 | 30.9 | 9.1 | 30.9 | 10.9 | 14.5 |
| 资料来源：环境保护部。 | ||||||||
| Source: Ministry of Environmental Protection. | ||||||||
