| Sampling point | Wet coffee processing owners | Location in Kayanza Province |
| Nyakagezi (A) River | Public | Muhanga Commune |
| Ruvubu2 (B) River | Public | Gatara Commune |
| Gisiza (C) River | Public | Gahombo Commune |
| Nyandibika (D) River | Public | Muhanga Commune |
| Ruvubu (E) River | Private | Gatara Commune |
| Nantangaro (F) River | Private | Kayanza Commune |
| Ntampanda (G) River | Private | Kayanza Commune |
| Nabadandi (H) River | Cooperative | Kayanza Commune |
| Nakagogo (I) River | Cooperative | Matongo Commune |
| Kurugomero (J) River | Cooperative | Kabarore Commune |