• Bruce Freeman Rail Trail, Concord
• Carlisle Trails
• Charles River Watershed Association, Weston
  
• Concord Council on Aging-seasonal cleanup
  
• Concord, Division of Natural Resources
  
• Concord Public Works
  
• Drumlin Farm, Lincoln
• Earthworks, Boston
  
• Friends For Tomorrow, Lincoln
  
• Gaining Ground, Concord
  
• Habitat for Humanity, Lowell
  
• Mass Audubon Sanctuary, Belmont
  
• Mass Horticultural Society, Wellesley
  
• NE Wildflower Society, Framingham
  
• Orchard House, Concord
  
• Organization for Assabet River
  
• Sierra Club
  
• The Food Project, Lincoln
  
• Walden Keeping Track

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