| Burlington. Legislative Services, Advisory Committees | Burlington |
| BurlingtonGreen Environmental Association | Burlington |
| Canada. Natural Resources Canada, Office of Energy Efficiency | Ottawa |
| Canadian Environmental Law Association | Toronto |
| Canadian Wildlife Health Cooperative, Ontario / Nunavut Region | Guelph |
| CLEAResult Canada, Central East, Authorized Delivery agent for Enbridge Home Winterproofing and IESO Energy Affordability Programs | Toronto |
| Conservation Halton | Burlington |
| Conservation Halton, Financial Assistance Programs | Burlington |
| Conservation Halton, Public Education/Outreach Programs | Burlington |
| Conservation Halton, Campbellville - Mountsberg Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Crawford Lake Conservation Area, Conservation Land & Recreational Trails | Milton |
| Credit Valley Conservation Authority, Limehouse Conservation Area, Conservation Land & Recreational Trails | Halton Hills |
| Credit Valley Conservation Authority, Silver Creek Conservation Area, Conservation Land & Recreational Trails | Halton Hills |
| Field and Stream Rescue Team | Burlington |
| Freshwater Conservation Canada - Greg Clark Chapter, Environmental Improvement Group | Halton Region |
| Friends of the Earth Canada | Ottawa |
| Greenpeace Canada, Community Programs | Toronto |
| Halton Bluebird Club | Oakville |
| Halton Environmental Network | Oakville |
| Halton North Peel Naturalist Club | Georgetown |
| Halton. Public Works, Halton Solid Waste Management Advisory Committee | Oakville |
| MiltonGreen Environmental Association | Milton |
| Niagara Escarpment Commission | Georgetown |
| Oakville Community Centre for Peace, Ecology and Human Rights | Oakville |
| Oakville. Parks and Open Space, Parks & Gardens | Oakville |
| Oakvillegreen Conservation Association | Oakville |
| Ontario. Ministry of Environment, Conservation and Parks, Peterborough - Mailing Address, Natural Resources Information and Support Centre | Peterborough |
| Ontario. Ministry of the Environment, Conservation and Parks, Halton-Peel MECP District | Burlington |
| Ontario. Ministry of the Environment, Conservation and Parks, Ontario Parks | Peterborough |
| Ontario. Ministry of the Environment, Conservation and Parks, Public Information Centre | Toronto |
| Ontario. Ministry of the Environment, Conservation and Parks, Spills Action Centre | Toronto |
| Plenty Canada | Lanark Highlands |
| Prime Earth, Youth Empowerment & Environmental Conservation Organization | Burlington |
| Protecting Escarpment Rural Land | Burlington |
| Sustainable Milton | Milton |
| Toronto Wildlife Centre | Toronto |
