| Sampling points | Seasons | Category |
| SS1 | Rainy | C |
| Dry | B | |
| WS1 | Rainy | D |
| Dry | D | |
| SS2 | Rainy | C |
| Dry | B | |
| WS2 | Rainy | C |
| Dry | A | |
| WS3 | Rainy | D |
| Dry | D |