Agencies – state, local & federal
- Andrews Air Force Base
- Antietam National Battlefield
- Arlington County Department of Parks, Recreation & Cultural Resources
- Bolling AFB
- Bolling Company Grade Officer's Council
- Bureau of Land Management
- CBIRF Marines
- Charles County Corrections State Highway Administration
- Charles County Litter Crew
- City of Alexandria
- City of Frederick
- City of Rockville
- Commonwealth of Virginia Department of Conservation and Recreation
- Community Employment Program at Way Station
- Court Appointed Special Advocates of Frederick County
- DC Department of Transportation
- DC Metro Police Department- 6th District
- DC Public Works
- DC- Solid Waste Environmental Enforcement Program (SWEEP)
- Department of Conservation and Recreation
- Department of Housing and Community Affairs & MNCP
- Department of Natural Resources
- Fairfax County
- Fairfax County Government Employees
- Fairfax County Park Authority
- Fairfax Water Authority
- Fort Belvoir
- Frederick County Department of Public Works
- Frederick County Humane Society
- Frederick County Senior Recreation Council
- Fulton County Conservation District
- George Washington Birthplace National Monument
- Greenbelt Council
- Harpers Ferry National Historical Park
- Interstate Commission on the Potomac River Basin (ICPRB)
- Mason Neck National Wildlife Refuge
- Mason Neck State Park
- MD Department of Natural Resources, Wildlife & Heritage Service
- MD State Parks
- Maryland National Capitol Parks and Planning Commission (MNCPPC)
- MNCPPC/Montgomery Parks
- Point Lookout State Park
- Prince Georges Department of Volunteer Services
- Prince William County, Historic Preservation Division
- Prince William Soil & Water Conservation District
- St. Mary's Department of Corrections
- St. Mary's County Museum Division
- Town of Dumfries
- Town of Herndon
- Town of Occoquan
- U.S. Navy –
- Dahlgren
- Indian Head
- Naval Research Lab (NRL)
- US Marines
- White House Communications Agency
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Schools and Universities
- Brunswick High School - HOPE Club, NHS & SGA
- Bullis School
- Catoctin High School - Junior Class, NHS & Peer Mediation
- Colvin Run Elementary School
- Edison High School Junior ROTC
- Fairfax Community College - Students for International Studies
- Flint Hill Lower School - 4th Grade
- Frederick High School - Senior Class
- Georgetown University
- Godwin Middle School
- Herndon High School NJROTC and SAGA Clubs
- Hood College
- McConnellsburg High School Earth Club
- Middletown Middle School Builders Club
- Mount Saint Mary's University
- New Life Christian School
- North Point High School
- Osborne Park High School
- Oneness Family School
- Poolsville High School
- Prince Georges Community College (PGCC) -Stem Collegians Center
- Pyle Middle School
- Silver Wings-MD & Del Universities
- South Lakes Environmental Club, IB Biology
- South County Secondary School
- South Lakes High School Environmental Club, NHS
- Springbrook High School
- St. Mary’s School of Piscataway
- St. Mary's College
- Thomas Stone High School
- Tuscarora High School Key Club
- University of MD Human-Computer Interaction Lab
- Urbana High School
- Walkersville High School – NHS & Key Club
- Walt Whitman High School
- Washington Waldorf School
- Woodbridge High School and JROTC
- Yorktown High School - NHS
Businesses
- 4114 Davis Place Condominiums
- Ashton Family LLP
- Aveda
- Belmont Bay Farm Ltd.
- Beveridge & Diamond, P.C.
- Calleva Outfitters
- CH2M Hill
- ESI Waste
- Exxon Mobil Corporation
- Hallco Enterprises
- Halliburton Corp.
- Hunting Terrace Apartments
- Invitrogen
- Jacobs & Associates
- Lansdowne Resort
- Marriot Corporation
- Mirant Power Co.
- Mirant-Morgantown Generating Station
- Noman M. Cole Jr. Pollution Control Plant
- Patagonia
- Potomac Crossing Consultants -Woodrow Wilson Bridge Project
- Starbucks
- Tamarack Stables
- Stress-Free Settlements
- United Health Care
- Valero Energy
- WestGroup
- Winchester Homes
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Youth Organizations
- Boy Scouts of America -
- Troops 52, 113, 158, 214, 217, 224, 245, 270, 410, 424, 913, 1011, 1083, 1570, 1255, 2051, 1580, 1577,
- Cub Scouts Packs 270, 425, 570, 1070, 1081, 1116, 1196, 1385, 1570
- Country Clovers 4-H Club
- Discovery Creek Museum
- Earth Conservation Corps (ECC)
- Fort Washington Pool Association
- Fulton County Juvenile Probation
- Grace United Church of Christ Youth Group
- Girl Scouts of the United States of America -
- Troops 127, 948, 1028, 1031, 1169, 1375, 1478, 1571, 3467
- Brownie Troops 379, 1629, 1640
- Cadet Troops 1088, 1275, NW
- Daisy Troop 1758, 5686
- Senior Troop 1526
- Service Unit 23-5
- Holy Family Catholic Church Youth Group
- Lion's Camp Merrick
- Metrolite Pathfinder Club
- Metro S.D.A. Sister to Sister Youth Ministry
- Monocacy Valley Church Youth Group
- Potomac River Rats
- Sister to Sister youth Ministry (Metropolitan)
- St. Luke's Lutheran Youth Department
- Student Conservation Association
- Student Environmental Coalition (Chi Beta)
- 4-H
- Calico Clovers
- Grace Super Sew-ers
- Lewistown Mountainview
- Youth Service America
Religious Organizations
- Apples United Church of Christ
- Bahai Group
- Chevy Chase Presbyterian Church Earth Stewards
- Frederick Rescue Mission
- Grace United Church of Christ
- Graceham Moravian Church - J C Crusaders
- Holy Family Catholic Church
- Hope Lutheran Church
- Indian Head Church
- Machar - Washington Congregation for Humanistic Judaism
- Metro Seventh Day Adventist
- Monocacy Valley Church
- North Chevy Chase Community Church
- River Road Unitarian Church
- St John's Church - Broad Creek
- St. John's Episcopal Church
- St. Luke's Lutheran
- St. Mary’s of Piscataway
- St. Paul Lutheran Church
- St. Timothy's Catholic Church
- The Water Boyz for Jesus
- Vessel Ministries & From the Heart Ministries
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- 16th Street Neighborhood Association
- Abilities Network
- ABWR Environmetal Education Center
- Accokeek Foundation/National Colonial Farm
- Adelphi Hills Community Association
- Alexandria Chapter of Food Not Bombs
- Alexandria Community Rowing
- Alpha Phi Alpha Fraternity, XI ALPHA LAMBDA Chapter
- American Rivers
- AmeriCorps
- Anacostia Watershed Society
- Arlington Democrats
- Arlingtonians for a Cleaner Environment (ACE)
- Audubon At Home in Middleridge
- Battersea Home Owners' Association
- Belmont Bay Civic Association
- Blue Banner Neighborhood
- Braddock District Democratic Committee
- Broad Creek Yacht & Recreation Club
- Brunswick Food Bank
- Bull Run Rotary
- Burleith Citizen's Association
- C& O Canal Association
- C&O Canal NHP Bike Patrol-Cumberland
- CAFPROC (Citizens Association For Preserving and Restoring Our Community)
- Calvert Manor Civic Association
- Calvin Park Civic Association
- Campagna Center's Retirement Home
- CCG
- Center for Peace
- Charles County Kiwanis Club
- Chase Hill Civic Association
- Chudzik family
- Civic Association of Hollin Hills
- Civil War Trust
- Clearwater Nature Center
- Coastal Conservation Association - Mason Springs Conservancy
- Cobb Island Citizens Association
- Cobb Island Volunteer Fire Department
- Communication Service for the Deaf
- Community Health Charities
- Crestwood Citizen's Association
- Daybreak Adult Day Services
- DC JCC
- Defenders of Potomac River Parkland
- EarthEcho International
- Earth Share Federation
- Emmitsburg Fire Department - Explorer Post 6
- Environmental Science Research Institute (ESRI)
- Fairfax Clean Council
- Fairfax Trails & Streams
- First River Farms HOA
- Fish America
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- Forest Heights Neighbors
- Fox Run HOA
- Frederick County Special Olympics
- Frederickson Family
- Friends of Accotink Creek
- Friends of Cub Run
- Friends of Folly Lick
- Friends of Hidden Pond
- Friends of Leesylvania
- Friends of Little Hunting Creek
- Friends of Little Rocky Run
- Friends of the Occoquan (FOTO)
- Friends of Quander Brook & Belle Haven Watershed
- Friends of Rock Creek's Environment (FORCE)
- Friends of Runnymede Park
- Friends of Sligo Creek
- Friends of the Potomac
- Friends of Whetstone Lake (FOWL)
- Friends of Whitehaven Park
- Fulton County Sportsman League
- Glover Park Citizens' Association
- Great Falls Trail Blazers
- Greater Tyson’s Greek Civic Association
- Greenbelt Recycling & Environment Committee
- Greenspring Village Retirement Home.
- Gusnton Manor Property Owners Association
- Hallowing Point River Estates
- Halpine View Apartments
- Harbor View Recreation Center
- Humane Society of Charles County
- International Association of Administrative Professionals (IAAP)
- ICMA
- Jeanne Bussard Center
- Jefferson County Watersheds Coalition
- Jeremy Foundation, Inc.
- Keep Loudon Beautiful
- Kings Grant
- Landscape and Nature Discoveries
- Lansdowne Conservancy
- Lewisdale Civic Association
- LIFE & Discovery
- Lions Club - Leytonsville, LaPlata, and DC
- London Wood Condo Association
- Lorton Community Resource Center
- Lorton Station HOA
- Margaritaville
- Mason Neck Citizen's Association
- Mason Neck Lions Club
- McLean Chamber of Commerce
- Melwood
- Middleridge Civic Association
- Middletown Leo Club
- Mid-River Club
- Montgomery County Young Democrats
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- Nanjemoy Community Group
- Nanjemoy Vision
- National Oceanic & Atmospheric Administration (NOAA)
- Naval District of Washington
- Naval Support Facility Indian Head
- National Park Service
- National Capital Parks –East
- National Capital Region
- Neighbors of Northwest Branch
- Neighbors of Rock Creek
- New Forest Society
- Newington Forest Community Association
- Northern Virginia Conservation Trust
- Northern Virginia Regional Park Authority
- Occoquan Watershed
- Olde Surrey Men's Club
- Piscataway Hills Citizens Association
- Point of View
- Port Tobacco River Conservancy, Inc.
- Potomac Appalachian Trail Club
- Potomac Conservancy
- Potomac Heritage Trail Association
- Prince William Clean Council
- Randolph Civic Association
- Recreational Boating and Fishing Foundation
- Reston Association
- Reston Environmental Action
- River Farms Homeowners Association
- Riverview Community Association
- SEAC
- Service Learning Advisory Board (SLAB)
- Second Street & Hope
- Seven Oaks/Evanswood Civic Association
- Shenandoah River Outfitters Association
- Sierra Club - Montgomery County Group
- Sierra Club of Great Falls
- Smallmouth Bass Club
- Southeast DC Partners
- Southeast Whitehouse
- Southern Maryland Carousel Group
- Springvale Civic Association
- State Farm Foundation
- Stone Manor HOA
- Suburban Frederick Kiwanis Family
- Surfrider - DC Chapter
- Swan Creek Club
- Trout Unlimited - Northern Virginia
- Under the Sea
- Volunteer Frederick
- Washington Parks & People
- Westmoreland Hills Garden Club
- Wicomico Scenic River Commission
- World Resources Institute
- YMCA Southeast Branch
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