- The 300 Committee
- Association to Preserve Cape Cod
- Back River Watershed Association
- Barnstable Land Trust
- Brewster Conservation Trust
- Brewster FLATS
- Burns Environmental Services
- Buzzards Bay Coalition
- Cape Cod Commission
- Cape Cod National Seashore Advisory Committee
- Chatham Conservation Foundation
- The Compact of Cape Cod Conservation Trusts
- Dukes County Natural Resources
- Eastham Conservation Foundation
- Eel River Watershed Association
- Forest Stewards Guild
- Friends of the Cape Cod National Seashore
- Friends of Ellisville Marsh
- Friends of Hawksnest State Park
- Friends of Myles Standish State Forest
- Friends of Nickerson State Park
- Friends of Scusset Beach Reservation
- Goldenrod Foundation
- Green Burial Council
- Green Burial Massachusetts
- Harvard Forest
- Harwich Conservation Trust
- Herring Ponds Watershed Association
- Herring River Restoration Committee
- Island Foundation
- Jones River Watershed Association
- Keep Massachusetts Beautiful
- Land Planning, Inc.
- Mass Audubon
- Mass Audubon Ecological Extension Service
- Massachusetts Department of Conservation and Recreation
- Massachusetts Division of Ecological Restoration
- Massachusetts Energy & Environmental Affairs
- Massachusetts Land Trust Coalition
- MIT Sea Grant
- Nantucket Conservation Foundation
- Nantucket Memorial Airport
- National Park Service
- Natural Heritage and Endangered Species Program
- The Nature Conservancy
- Neponset River Watershed Association
- NOAA
- North and South River Watershed Association
- Northeast Forest and Fire Management
- Orenda Wildlife Trust
- Oyster Pond Environmental Trust
- Pembroke Watershed Association
- Pleasant Bay Alliance
- Salt Pond Areas Bird Sanctuaries
- Save the Bay - Narragansett Bay
- Six Ponds Improvement Association
- Taunton River Watershed Alliance
- Tidmarsh Farms
- Town of Barnstable Division of Marine and Environmental Affairs
- Town of Barnstable Natural Resources
- Town of Barnstable Planning Board
- Town of Bourne Conservation Commission
- Town of Bourne Natural Resources
- Town of Bourne Planning Board
- Town of Brewster Natural Resources Department
- Town of Brewster Planning Board
- Town of Carver Conservation Commission
- Town of Carver Planning and Community Development
- Town of Chatham Conservation Agent
- Town of Chatham Natural Resources
- Town of Chatham Planning Board
- Town of Chilmark Planning Board
- Town of Cohasset Conservation Commission
- Town of Dennis Natural Resources
- Town of Dennis Planning Board
- Town of Duxbury Community Preservation Committee
- Town of Duxbury Conservation Commission
- Town of Duxbury Department of Public Works - Lands & Natural Resources
- Town of Duxbury Planning Board
- Town of Eastham Conservation and Wetlands
- Town of Eastham Natural Resources Department
- Town of Eastham Planning Board
- Town of Edgartown Conservation Commission
- Town of Edgartown Planning Board
- Town of Falmouth Conservation Commission
- Town of Falmouth Natural Resources
- Town of Falmouth Planning Department
- Town of Halifax Conservation Commission
- Town of Harwich Natural Resources
- Town of Harwich Planning Board
- Town of Hingham Conservation Commission
- Town of Kingston Conservation Commission
- Town of Kingston Planning Department
- Town of Marion Conservation Commission
- Town of Marion Planning Board
- Town of Marshfield Conservation Commission
- Town of Mashpee Conservation Commission
- Town of Mashpee Natural Resources
- Town of Mashpee Planning Board
- Town of Mattapoisett Animal Control and Shellfish Department
- Town of Mattapoisett Planning Board
- Town of Nantucket Natural Resources
- Town of Nantucket Planning Board
- Town of Norwell Conservation Commission
- Town of Oak Bluffs Planning Board
- Town of Orleans Conservation Commission
- Town of Orleans Natural Resources
- Town of Orleans Planning Board
- Town of Pembroke Community Preservation Committee
- Town of Pembroke Conservation Commission
- Town of Plymouth Community Preservation Committee
- Town of Plymouth Conservation Commission
- Town of Plymouth Department of Marine and Environmental Affairs
- Town of Plymouth Natural Resources & Coastal Beaches Committee
- Town of Plymouth Open Space Committee
- Town of Plymouth Planning Board
- Town of Plymouth Tidal Beaches Advisory Committee
- Town of Plympton Conservation Commission
- Town of Provincetown Conservation Commission
- Town of Provincetown Department of Harbor and Pier
- Town of Provincetown Environmental Planning and Conservation
- Town of Provincetown Planning Board
- Town of Rochester Conservation Commission
- Town of Rochester Planning Board
- Town of Sandwich Conservation Commission
- Town of Sandwich Planning Board
- Town of Scituate Conservation Commission
- Town of Seekonk Conservation Commission
- Town of Tisbury Planning Board
- Town of Truro Conservation Commission
- Town of Truro Planning Board
- Town of Wareham Conservation Commission
- Town of Wareham Planing Board
- Town of Wellfleet Conservation Commission
- Town of Wellfleet Health/Conservation Department
- Town of Wellfleet Natural Resources
- Town of Wellfleet Planning Board
- Town of West Tisbury Conservation Commission
- Town of West Tisbury Planning Board
- Town of Yarmouth Natural Resources
- Town of Yarmouth Planning Board
- The Trustees of Reservations
- U.S. Fish and Wildlife Service
- Vineyard Conservation Society
- Wampanoag Tribe of Gay Head
- Waquoit Bay National Estuarine Research Reserve
- Wareham Land Trust
- Watershed Action Alliance of Southeastern Massachusetts
- Weir River Watershed Association
- Westport River Watershed Alliance
- White Horse Beach Association
- Wildlands Trust of Southeastern Massachusetts