| Value | Category | Cases | |
|---|---|---|---|
| 1 | Wastewater | 26 |
1%
|
| 2 | Dumping site | 29 |
1.1%
|
| 3 | Public restrooms | 2 |
0.1%
|
| 4 | Transportation | 11 |
0.4%
|
| 5 | Agricultural wastes | 17 |
0.7%
|
| 6 | Industrial activities | 8 |
0.3%
|
| 7 | others | 8 |
0.3%
|
| Sysmiss | 2511 |