| Earth Day Canada | |
| Environment Network | Collingwood |
| GreenUP, Peterborough - Aylmer St N, Administration | Peterborough |
| Lake Huron Coastal Centre, No Physical Address | Goderich |
| Nottawasaga Valley Conservation Authority, Tiffin Centre for Conservation | Utopia |
| Ontario Nature, Toronto | Toronto |
| Ontario Public Interest Research Group, Peterborough | Peterborough |
| Ramara Township, Brechin - 2297 Hwy 12, Infrastructure | Ramara |
| Rescue Lake Simcoe Coalition | Aurora |
| Severn Sound Environmental Association | Tay |
| Severn Sound Source Protection Authority, Drinking Water Source Protection | Tay |
| Simcoe County Greenbelt Coalition, Mailing Address | Simcoe |
| Sustainability Project (The) | South Bruce Peninsula |