C/P | Significance |
<0.1 | Very slight contamination |
0.10 - 0.25 | Slight contamination |
0.26 - 0.50 | Moderate contamination |
0.81 - 0.75 | Severe contamination |
0.76 - 1.0 | Very severe contamination |
1.1 - 2.0 | Slight pollution |
2.1 - 4.0 | Moderate pollution |
4.1 - 8.0 | Severe pollution |
8.1 - 16.0 | Very severe pollution |
>16 | Excessive pollution |