Montana Underground Injection Wells regulations & environmental compliance analysis

Montana Underground Injection Wells: What you need to know

Governing Law and Regulations

Underground injection control (UIC), Class II wells: Administrative Rules of Montana (ARM) 36.22.1401 to 36.22.1425

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New and existing wells: ARM 36.22.1402

Applications: ARM 36.22.1403

Application signature: ARM 36.22.1407

Fees: ARM 36.22.1423

Regulatory Agencies

Montana Department of Natural Resources and Conservation Board of Oil and Gas Conservation (Board)

Montana Department of Environmental Quality (DEQ) Permitting and Compliance Division Water Protection Bureau

U.S. Environmental Protection Agency (EPA) Region 8

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. The federal rules that apply to underground injection are in effect in Montana. Montana has also established its own state-specific underground injection well program that covers Class II wells. See the national section UNDERGROUND INJECTION WELLS for additional information about the federal rules.

Administration and enforcement. EPA Region 8 enforces the hazardous waste UIC regulations in Montana because DEQ has not been delegated primary enforcement responsibility for Class I, III, IV, and V wells. The Board does have the lead enforcement role for the UIC program for oil- and gas-related injection wells on nontribal lands.

State Requirements


ARM 36.22.1401 to 36.22.1425

Montana issues permits for Class II injection wells. A Class II injection well:

  • Injects fluids brought to the surface in conjunction with conventional oil and gas production and may be commingled with wastewaters from gas plants that are an integral part of production operations unless those waters are classified as a ...

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