Organizations that regularly need volunteer assistance:
Abington EAC
Cheltenham EAC
Fairmount Park Commission
Friends of High School Park
Greater Philadelphia Cares
Greater Philly Environmental Network [Check out their huge database of events!]
Green Jenkintown
Philadelphia Orchard Project

Organizations that provide volunteers:
Arcadia University Biology Club
Arcadia University Environmental Network
City Year, Frankford High School

Environmental Advisory Councils (EACs):
Abington EAC
Cheltenham EAC
Green Jenkintown

Friends Groups:
Friends of Cliveden Park
Friends of Grove Park
Friends of High School Park
Friends of Tacony Creek Park