IDEM is primarily organized [PDF] into six main offices: Chief of Staff, Legal Counsel, Air Quality, Land Quality, Water Quality, and Program Support.

The Chief of Staff’s Office includes:

• Communications and External Relations;
• Human Resources;
• Finance Division;
• Information Services;
• Business and Legislative Relations; and
• Agricultural Relations.

The Office of Program Support in divided into four (4) sections:

• Recycling, Education and Quality Assurance
• Pollution Prevention and Compliance Assistance
• Health and Safety
• Four Regional Offices (Northern, Northwest, Southeast, Southwest)

IDEM Organizational Structure:

• Commissioner - Bruno L. Pigott
  • Administrative Assistant - Mary Fields
  • Chief of Staff - Brian Rockensuess
    • Business Services and Contracts - Michelle Wright
    • Chief Financial Officer - Kim Diller
    • Deputy Chief of Staff - Vacant
    • Director of Human Resources - Corliss White
    • Director of Communications and External Relations - Ryan Clem
  • General Counsel Office of Legal Counsel and Criminal Investigations - Nancy King
    • Deputy Assistant Commissioner Office of Legal Counsel and Criminal Investigations - Valerie Tachtiris
  • Assistant Commissioner Office of Air Quality - Keith Baugues
    • Deputy Assistant Commissioner Office of Air Quality - Matthew Stuckey
  • Assistant Commissioner Office of Land Quality - Peggy Dorsey
    • Deputy Assistant Commissioner Office of Land Quality - Doug Louks
    • Deputy Assistant Commissioner Office of Land Quality - Corey Webb
  • Assistant Commissioner Office of Water Quality - Martha Clark Mettler
    • Deputy Assistant Commissioner Office of Water Quality - Paul Higginbotham
  • Assistant Commissioner Office of Program Support and Agricultural Liaison - Julia Wickard
    • Deputy Assistant Commissioner Office of Program Support - Robert Lugar
    • Director of the Northwest Regional Office - Hala Kuss
    • Director of the Northern Regional Office - Jim Weingart
    • Director of the Southeast Regional Office - Mark Amick
    • Director of the Southwest Regional Office - David Holder