Rock Creek Park, National Park Service District of Columbia Department of Environment Interstate Commission on the Potomac River BasinMaryland Department of the Environment, Middle Potomac Tributary Team Maryland Department of Natural ResourcesMaryland National Capital Parks and Planning Commission Montgomery County Department of Environmental ProtectionCity of Rockville
Alice Ferguson Foundation Anacostia Watershed Society Audubon Naturalist Society Dumbarton Oaks Park ConservancyFriends of Peirce MillFriends of Sligo CreekLittle Falls Watershed AllianceNational Capital Chapter of Trout UnlimitedNeighbors of the Northwest BranchPotomac Appalachian Trail ClubPotomac Conservancy Save Klingle Valley Sierra Club Montgomery County ChapterStormwater PartnersTregaron ConservancyWashington Parks and People
Center for Watershed ProtectionRiver NetworkStudent Conservation Association
Many agencies and local, regional, and national nonprofit organizations have an interest in protection of Rock Creek's natural areas or nearby waterways.