PEREC initiatives have been realized in partnership with:
- Alexandria Renew Enterprises
- Alice Ferguson Foundation
- NOVA Outside Alliance of Environmental Educators
- Interstate Commission on the Potomac River Basin
- Metropolitan Washington Council of Governments
- Prince William County Division of Solid Waste
- Prince William County [Virginia] Public Schools
- Fairfax County
- Fairfax County Park Authority
- City of Fairfax
- National Park Service, National Capital Region
- NOVA Parks
- Occoquan Watertrail League
- Occoquan Bay National Wildlife Refuge
- Elizabeth Hartwell Mason Neck National Wildlife Refuge
- Mason Neck State Park
- Meadowood BLM Area