| 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 | 1.9 | 50.6 | 36.9 | 6.3 | 1.2 | 3.1 |
| 黄 河 | Huanghe River | 61 | 1.6 | 25.8 | 30.7 | 17.7 | 8.1 | 16.1 |
| 珠 江 | Zhujiang River | 54 | 79.6 | 14.8 | 5.6 | |||
| 松花江 | Songhuajiang River | 88 | 5.7 | 50.0 | 30.7 | 7.9 | 5.7 | |
| 淮 河 | Huanhe River | 95 | 6.4 | 53.2 | 18.1 | 10.6 | 11.7 | |
| 海 河 | Haihe River | 64 | 1.6 | 18.8 | 18.7 | 9.3 | 12.5 | 39.1 |
| 辽 河 | Liaohe River | 55 | 1.8 | 36.4 | 7.3 | 45.5 | 3.6 | 5.4 |
| 资料来源：环境保护部。 | ||||||||
| Source: Ministry of Environmental Protection. | ||||||||
