Region 8

Underground Injection Control

Region 8 States selector map

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In a cooperative effort between EPA, state and tribal governments, the UIC Program works toward protecting underground sources of drinking water (USDW) from contamination by regulating the construction and operation of injection wells. Underground injection wells are primarily used to dispose of wastes into the subsurface and have the potential to adversely affect USDWs. Five classes of wells are defined according to the type of waste that is disposed and where the waste is injected. Detailed information on regulations can be found at EPA Regulations.

A brief description of the well types:

Class I: Industrial and Municipal Wells that Inject Beneath Lowermost USDW
Class II: Associated with Oil and Gas Production
Class III: Associated with Mineral Recovery
Class IV: Wells Injecting Hazardous Waste into USDWs (prohibited)
Class V: Injection Wells Not Included in Other Classes (typically Shallow Disposal Systems)

UIC Announcements


North Dakota’s UIC Class VI Primacy Application

View all documents pertaining to this application


Powertech (USA) Inc.'s Dewey Burdock Uranium Is-Situ Recovery UIC Permit Application: Class III Permit Application for deep injection wells related to uranium production and used for disposal of process waste fluids.

Dewey Burdock Application

Class V Permit Application (note: VERY large PDF file)(159 pp, 80 MB)

UIC Public Notices

UIC Class II Area Permit MT22326-00000 - Provident Energy of Montana - Austin, Texas 

The EPA Region 8 UIC Program is soliciting public comment on the proposed issuance of Area UIC Permit MT22326-00000 for the Two Medicine Cut Bank Sand Unit of the Cut Bank Oil Field. This Permit would replace existing injection well permit MT22274-10103 for the Tribal Max 1-2817 and would authorize six additional injection wells for the purpose of an enhanced oil recovery pilot project. If the pilot is successful, the approximately 12 square mile permit area could eventually contain as many as 25 injection wells. The injection zone for the area permit is the Cut Bank Formation and injectate would be a combination of water produced from the Cut Bank and Madison formations within the permit area. The public notice period for the proposed action will end 30 days from the last date of publication of an announcement in the Glacier Reporter in Browning, Montana, the Cut Bank Pioneer Press in Cut Bank, Montana, and the Shelby Promoter in Shelby, Montana. For additional information, contact Jason Deardorff of the EPA Region 8 UIC Program by email at or by phone at 800-227-8917 extension 312-6583, or 303-312-6583.

    Notice of Proposed Area Permit Action

UIC Class II Public Notice of Proposed Actions

These actions would authorize the injection of fluids into the subsurface for the purpose of either enhancing the production of oil and gas resources or disposal of produced water associated with these operations, and may include a proposed Aquifer Exemption of the Proposed Injection Zone(s).

All written comments and requests for additional information should be addressed to the EPA contact person at the following address:

U.S. EPA Region 8 (8P-W-UIC)
1595 Wynkoop Street
Denver, CO 80202-1129

Complete permit applications and related documents are also available for review and reproduction at this address from 10 a.m. to 4 p.m., Monday through Friday, federal holidays excluded. To make an appointment, please call the EPA contact.





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