Major Partners
- C & O Canal Association
- Fairfax County Park Authority
- Friends of Rock Creek Park's Environment (FoRCE)
- Interstate Commission on the Potomac River Basin ICPRB
- Livable Communities Initiative
- Maryland-National Capital Park and Planning Commission
- Montgomery County Parks
- National Park Service
- Northern Virginia Soil and Water Conservation District
- PA Cleanways
- Potomac Conservancy
- Potomac Riverkeepers
- REI
- Reston Association
- Volunteer Frederick—BIG Sweep
Sponsors
- Beveridge & Diamond, P.C.
- Chesapeake Bay Trust
- Crowell & Moring, LLP
- Patagonia
- Telemundo
- Winchester Homes
Educational Institutions
- Annandale High School Environmental Club Friends of Accotink Creek
- Barnsley Elementary School
- Belmont Ridge Middle School Ecology Club
- Catoctin High School - National Honor Society
- Clarksburg Elementary School Students
- Colvin Run Elementary School National Park Service
- Department of Education (Hispanic)
- Flint Hill Private School science class
- George Mason University - Institute for Conflict Analysis and Resolution
- Gov. Thomas Johnson High School - SHOP
- Gunston Middle School
- Han Su Tae Kwon Do School
- Howard University -- Students
- Howard University— Film Organization
- Howard University—Ecology Class
- Jack's second grade class
- Laurel High School Environmental Science classes
- Oakdale Middle School
- Oxon Hill High School
- Piccowaxen Middle School
- Poolesville High School
- Poolesville High School— Paddle Club
- Potomac Elementary School Parent Teacher Association
- Pyle Middle School
- Rock Creek Valley Elementary School
- Rockville High School
- South Lakes High School Environmental Club Science Class
- South Lakes High School Leadership Class
- St Mary's Ryken
- St. John's Evangelical Lutheran Church
- St. John's School O'Melveny & Myers
- St. Mary's College InterVarsity
- St. Mary's of Piscataway Church
- T.C. Williams High School
- Tuscarora High School
- Tuscarora High School Key Club
- Tuscarora High School National Honor Society
- University of Maryland Center for Advanced Study of Language
- University of San Diego Alumni Association DC Chapter
- Urbana High School National Honor Society
- W.T. Woodson Science Honor Society
- Walkersville High School - National Honor Society
- Walkersville Middle School
- Windsor Knolls Middle School Student Government Association
- Wood Middle School
Regional
- Boy Scouts of America
- Clean Water Action
- Girl Scouts of America
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Federal
- National park Service- National Capital Region
- National Oceanic Atmospheric Administration
- US Air Force
- Bolling Air Force Base
- Andrews Air Force Base
- US Department of Navy
- Indian Head Naval Warfare Center
- US Environmental Protection Agency
- US Bureau of Land Management
- US National Fish and Wildlife Service
- United States Postal Service
Military
- National park Service- National Capital Region
- National Oceanic Atmospheric Administration
- US Air Force
- Bolling Air Force Base
- Andrews Air Force Base
- US Department of Navy
- Indian Head Naval Warfare Center
- US Environmental Protection Agency
- US Bureau of Land Management
- Air Force
- CBIRF Marines
- Col. Norris Camp #1398
- Families from Andrews Air Force Base
- Navy
- Navy Civilian Employees
- United States Coast Guard
- United States Coast Guard Auxiliary
Businesses
- Alexandria Sanitation Authority
- Aveda Cosmetics
- Booz Allen Hamilton
- CASA - Court Appointed Special Advocates for Children
- Clouis Corporation
- Coca-Cola Enterprises
- Costco Foods
- Dunkin' Donuts
- Earth Tech
- Ecolab
- Frederick County Bank
- Frederick News-Post
- Landscape and Nature Discoveries, Inc.
- Market Bagel and Deli
- Marriott
- Mirant Potomac River, LLC
- NuStar Company
- Potomac Crossing Consultants
- Techknow Engineering, LLC,
- WEST*GROUP
Religious Organizations
- Apples United Church of Christ
- Bethesda Jewish Congregation
- Bethesda United Church of Christ
- Breathe of Life SDA church
- Bush Creek Church of the Brethren
- Chevy Chase Presbyterian Church
- Christian Fellowship Club
- Christian Men's Network of Frederick
- Damascus United Methodist Church
- Epicenter Church
- Foundry United Methodist Church
- Graceham Moravian Church - JC Crusaders
- Interfaith Youth Core
- Millian Methodist Church Youth Group
- Monocacy Valley Church
- Mountain View Community Church
- New Life Church Vessel Ministries
- Pathfinders
- Peoples Congregational Church
- Presbyterian Church
- Project of Calvary Road Christian School
- The Waterboyz for Jesus
- Trinity Assembly of God
- Unitarian Universalist Church in Reston
Families
- Andrew & Carrie Love
- Carpinone Family
- Chudzik Family
- Cummins family
- Jones Family Friends of Mason Neck State Park
- Ms. Amanda Bressler
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Youth Organizations
- 4-H Achievers
- 4-H Creative Critters
- Boy Scout of America
- Crew 1083, 1081,439,1083, 137, 1378, 1988 Pack 1756, 214, 253, 410, 424, 52, 1070, 1636, 1812, 217, 270, 1778, 310, Den 544, 548, 856, Den 5, Pack 1116, Pack 137
- Boys and Girls Club of Frederick County
- Brownie Girl Scout
- Troop 81502, 1307, 1629, 2046
- Calico Clovers 4-H Club
- Cub Scout
- Pack 1069, 1070, 1345, 1509, 270, 423 Den 5, 423, 425, 521, 32, 421
- Fairfax 4-H Extension Program
- Girl Scout Cadette
- Troop 81033, 81088, 1028, 127, 1801, 1875, 3695, 81169, 81594, 81478, 81579, 2581
- Grace Super Sewers 4-H Club
- Islamic Society of Frederick Youth Group
- Lewistown Mountain View 4-H Club
- Muslim American Society Youth of D.C.
- Venture Crew from Troop 1321
- Youth Service America
Pennsylvania
- Pennsylvania Department of Environmental Protection
- PACleanways
- Penn Dot
- Adams, Bedford, Franklin, Somerset and Fulton Counties
Maryland
- Accokeek Foundation
- Charles County Commissioners
- Charles County Department of Public Facilities
- Maryland Department of Natural Resources
- Maryland National Capital Park and Planning Commission
- Montgomery County Department of Environmental Protection
- Montgomery County Parks
- Maryland State parks
- Nanjemoy Community
- Prince George’s County Department of Environmental resources
- Prince George’s Livable Communities Initiative
- St. Mary’s Department of parks and Recreation
- Waste Management of Southern Maryland
Washington DC
- Capital River Relief
- DC Department of Public Works
- DC Parks and Recreation
- Office of the City administrator
- Washington DC Council Members
- Washington parks and People
West Virginia
- Jefferson County Watershed Coalition
- Potomac Valley Audubon Society
- Sleepy Creek Watershed Association
- West Virginia department of Environmental Protection
- West Virginia Make it Shine
- Blue Heron Foundation
- Eastern Panhandle Conservation District
Virginia
- Alexandria Parks Department
- Arlington Council Members
- Arlington Department of Environmental Services
- Arlingtonians for a Clean Environment
- Fairfax County Board of Supervisors
- Fairfax County Department of Public Works and Environmental Services
- Fairfax county Park Authority
- Fairfax Watershed network
- Northern Virginia Regional Park Authority
- Reston Association
- Virginia department of Environmental Quality
- Virginia State Parks
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- Access Fund
- Adopt-a-Highway
- Adventurers Scout Council
- Alexandria Community Rowing
- Alexandria Sanitation Authority
- Antietam Creek Watershed Association
- Audubon At Home in Middleridge
- Bel Air Civic Association
- Braddock District Democratic Committee
- Brookmont neighborhood
- Brunswick Food Bank
- CAFPROC-Citizens Association For Preserving Our Community
- Canoe Cruisers Association
- Charles County Corrections
- Charles County Service Group
- Charles County Sheriff
- Charles County Teachers
- Chase Hill Civic Association
- Chesapeake Section America Waters Works
- CHS Peer Mediators
- Citizens for Humanity
- Citizens to Save South Valley Park
- City of Alexandria
- City of Frederick
- City of Greenbelt
- City of Rockville
- Civic League of North Portal Estates
- Civil War Preservation Trust
- Coastal Conservation Association
- Cobb Island Citizens Association
- Cobb Island Fire Department
- Cobb Island Gardening Club
- Court Support and Offender Services Agency
- Crestwood Citizens Association
- Cumberland C&O Bike Patrol
- Dairy Maid
- Dandelion Christian Child Care
- DC Surfrider
- DC Yahooers
- DC Young Professionals/Kiwanis
- Detrick Road Cleanup Crew
- Fairfax Trails and Streams
- Frederick County Volunteer & Medical Reserve Corps
- Frederick Police Explorer Post 714
- Frederick Walkers
- Friends of Accotink Creek also conducts fall cleanups
- Friends of Chapman's State Park
- Friends of Dyke Marsh
- Friends of Little Hunting Creek
- Friends of Little Rocky Run
- Friends of Still Creek
- Friends of Occoquan
- Friends of the Cacapon River
- Friends of the National Zoo
- Friends of the Potomac River Refuges
- Friends of Waterford Park
- FSK Apartment Associates
- Fuller4Eartth
- Governor's Office on Service and Volunteerism
- Great Falls Citizens Association
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- Great Falls Trail Blazers
- Great Falls Volunteer Fire Department
- Greater Tysons Green Civic Association
- Green Valley YMCA
- Group Home for Boys
- GSCNC Cadette/Senior Troop 81786
- GSCNC Mountain View Europe Group
- Hallco Enterprises
- Hallowing Point River Estates
- Harpers Ferry Outdoor Festival
- Harvard Club
- Heartly House
- Heinz Center
- Holy Family Catholic Community
- Hope Alive
- Hospice of Frederick County
- Humane Society TWLA Club
- Installation Directorate
- International Finance Corporation
- INVISTA
- Jeanne Bussard Center
- Juvenile Services Organization
- Kalorama Citizens Association (KCA)
- Key 103.1 WAFY
- KIND Club
- Kingston Chase Homeowners Association
- Lakeford Community Association
- Lions Club,
- Local Canoe Club
- Mantua Home Owners Association
- Mason Neck Citizens Association
- Mason Neck Lions Club
- Mason Neck Lions Club Fairfax Yacht Club
- Mason Neck Lions Club Friends of Meadowood
- Mason Springs Conservancy
- MasonDixon Canoe Club
- Melwood
- Mid Atlantic Water Program
- Mid-Atlantic Climbers
- Middleridge Civic Association
- Montgomery Rams Football Team
- Morgan-Keller
- Mount Zephyr Citizen's Association
- Moyaone Reserve
- National Zoological Park/FONZ Green Team
- Northern Massachusetts Avenue Business Improvements Districts (NoMa BID)
- Northern Virginia Ethical Society
- Northwest Frederick County Civic Assoc.
- Opequon Creek Project Team
- Piliero Mazza
- Piney Point Lighthouse Museum Volunteers
- Piscataway Hills Community Association
- Point of Rocks Ruritan Club
- Potomac Almanac
- Potomac Appalachian Trail Club Project Performance Corporation
- Potomac Crossing Consultants
- Prince William Trails and Streams Coalition
- Protiviti
- Randolph Civic Foundation (RCA/RCF)
- Red Cross
- REI Staff volunteers
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- Residents of Swan Creek Club Development
- Retired and Senior Volunteer Program (RSVP)
- River & Trail Outfitters
- Rivers of the World Foundation
- Rock Creek Gardens Condominiums
- Roots and Shoots
- Sandy Spring Bank
- Scientists of National Zoological Park
- Scott Key Center
- Seneca Creek Watershed Partnership
- Senior Recreation Council
- Shenandoah Chapter of Trout Unlimited
- Shepherd Park Citizens Association
- Sierra Club
- Sierra Club-Great Falls Group
- Single Professionals of Loudoun
- Sir Speedy
- Sleepy Creek Watershed Association
- Small Angels Rescue, Inc.
- Sons of Confederate Veterans
- South Lakes Gold Silver Seniors Volunteer Fairfax
- South Mountain Heritage Society
- South Silver Spring Neighborhood Association
- Southern Maryland Audubon Society
- Springvale Civic Association
- Stafford County Parks and Recreation
- State Department of Ocean Affairs
- State Farm Foundation (lead Agency)
- Stratford Landing Citizens' Association
- Sycamore Island Club members
- The Common Market
- The Gazette
- The Izaak Walton League of America - IWLA
- The Jeffrey Hayek Memorial Fund c/o The Community Foundation of Frederick Co.
- The Jeremy Foundation
- The Swan Point Yacht Club
- Theodore Roosevelt Association
- Thomas Boathouse women's team
- Thompson Boat Center Racing Team
- ThorpeWood
- Tiburon Home Owners Association and Friends
- Villages of Urbana
- Virginia Department of Transportation
- Virginia Water Environment Association
- Volunteer Frederick Youth Action Corps
- Ward 4 Democrats
- Washington DC Area Parrot Head
- Washington Metropolitan Area Corporate Counsel Association
- Water Community
- Watershed Management Branch of Public Works
- Wells Fargo Home Mortgage
- West Hampton Community
- West Montgomery County Citizens Association
- Whetstone Run
- Woodley Hills Community Association
- Yamuna Foundation for Blue Water
- YMCA of Frederick County
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