EP 1.1: Environmental Protection Agency (1970- )
EP 2.1: Office of Water (1970- )
EP 3.1: Office of Solid Waste (1970-?)
EP 4.1: Air and Radiation Office
EP 4.52: Air Quality Planning and Standards Office
EP 5.1: Office of Chemical Safety and Pollution Prevention (1980- )
EP 6.1: Office of Radiation and Indoor Air (1970- )
EP 6.52: Office of Transportation and Air Quality
EP 7.1: Technology Transfer and Outreach (1971- )
EP 8.1: Office of Wetlands, Oceans and Watersheds
EP 9.2: Office of Emergency Management
EP 10.2: Office of Solid Waste and Emergency Response
EP 10.102: Technology Innovation and Field Services Division (1990- )
EP 11.1: Office of Research and Development
EP 12.1: Office of Inspector General
EP 13.2: Office of Enforcement and Compliance Assurance (1992- )
