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| Department of Environment and Natural Resources (DENR) (6) |
| Iloilo (6) |
| water pollution (6) |
| environmental restoration (5) |
| rivers (4) |
| coliforms (3) |
| Drilon, Franklin (3) |
| Hechanova, Noel (3) |
| Man-induced effects (3) |
| river restoration (3) |