| Alberta Adjacent Landowners Association | Legal Professionals |
| Alberta Property Rights Initiative | Municipal Councils |
| Competitive Enterprise Institute (U.S.) | National Citizens Coalition |
| Canadians for Charter Equality | Neebing Citizen Action Committee |
| Canadian Taxpayers Federation | Niagara Escarpment Commission |
| Centre for Freedom and Democracy | Ontario Institute of Agrologists |
| EcoLogic, Freedom 21 (U.S.) | Ontario Federation of Agriculture |
| Environment Canada | Ontario Ministry of Natural Resources |
| Environment Probe | Ontario Real Estate Association |
| Georgian Triangle Development Institute | Peel Halton Landowners Association |
| Global Architect Inc. | Peterborough Landowners Association |
| Government of Ontario | University of Guelph |
| Halton Federation of Agriculture | Westview Farm & Wood Products |
| InfoResults | York Durham Farmers Assessment Association |
ONTARIO PROPERTY AND ENVIRONMENTAL RIGHTS ALLIANCE