State and Local:
- Brandywine Conservancy
- Chesapeake Bay Foundation
- Chester County Conservation District
- Chester County Solid Waste Authority
- Chester County Water Resources Authority
- Clean Water Delaware
- Delaware Nature Society
- Delaware River Basin Commission
- Delaware Riverkeeper
- Green Valleys Watershed Association
- Penn State University Chester County Extension Office
- Pennsylvania Department of Conservation of Natural Resources
- Pennsylvania Department of Environmental Protection
- Pennsylvania Fish and Boat Commission
- Schuylkill Action Network
- Stormwater PA
- University of Delaware Water Resources Center
- White Clay Creek National Wild & Scenic Rivers Program
- White Clay Watershed Association
National and Federal:
- Center for Watershed Protection
- Clean Water Network
- National Fish and Wildlife Foundation
- National Institutes for Water Resources
- Natural Resources Conservation Service
- Pennsylvania Organization for Watersheds and Rivers
- United States Environmental Protection Agency
- United States Environmental Protection Agency, Region III
- United States Geological Survey
- International Rivers: People, Water, Life