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State Regulations: Illinois

State of Illinois

The Division of Oil and Gas (DOG) in the Office of Mines and Minerals (OMM) of the Illinois Department of Natural Resources (IDNR) protects Illinois land and water resources and promotes orderly resource development during exploration and production of oil and gas. Otherwise, the Illinois Environmental Protection Agency (IEPA) administers the major environmental protection laws. The Illinois Pollution Control Board (IPCB) is an independent state agency charged with promulgating environmental regulations and adjudicating a variety of environmental cases in Illinois.


Illinois Department of Natural Resources
Office of Mines and Minerals
Division of Oil and Gas
524 South Second Street
Springfield, IL 62701
(217) 782-7756 (phone)

Illinois Environmental Protection Agency
1021 North Grand Avenue East
Springfield, IL 62702
217-782-3397 (phone)

Illinois Pollution Control Board
600 South Second Street, Suite 402
Springfield, IL 62704
(217) 524-8500 (phone)
(217) 524-8508 (fax)

Disposal Practices and Applicable Regulations

The Division of Oil and Gas (DOG) regulates the injection of fluids, including produced water, into underground injection wells. Oil and gas rules in Part 240 of Title 62 of the Illinois Administrative Code require that anyone who wants to construct and operate a Class II injection well must first meet technical requirements and obtain a permit for that activity. The environmental protection regulations are contained in Title 35 of the Illinois Administrative Code.

  • Permit Application Procedures for Class II Wells (Section 240.300 et seq.).
    • The application must provide detailed information with respect to the well project.
    • Freshwater aquifer exceptions and exemptions must have been secured.
    • The submission of the proposed well construction and operating parameters must offer information relative to the injection rate, injection fluid, and proposed maximum injection pressure.
    • Proof of notice to the public, surface owner, and any permittee located within (1/4) mile must be submitted.

  • Well Construction, Operating, and Reporting Requirements for Class II Wells (Section 240.700 et seq.).
    • Surface casing and production casing requirements apply to newly drilled, conversion, and existing wells.
    • Internal and external mechanical integrity must be established.
    • Reporting must include the (OG-17) Secondary/Tertiary Oil Recovery Project Annual Report and the (OG-18) Annual Class II Well Report.
    • Only Class II fluids shall be disposed of in a water injection, saltwater disposal or commercial saltwater disposal well.