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Underground Injection Wells
National Summary
The Safe Drinking Water Act (SDWA) protects all sources of drinking water, including underground sources (aquifers). Under the SDWA, the underground injection control (UIC) program regulates any injection of waste into the subsurface. The U.S. Environmental Protection Agency (EPA) groups underground injection wells into six classes for regulatory control purposes.
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TypeTitleDateState
Guidance Documents 2000 Memorandum: Well Classification Guidance for Downhole Hydrocarbon/Water Separators  National
Guidance Documents 2007 Memorandum: Using the Class V Experimental Technology Well Classification for Pilot Carbon Geologic Sequestration Projects  National
Proposed Regulations 40 CFR 147 - Request for Comments on Michigan Underground Injection Control Class II Program Application 04/15/2020National
Final Regulations 40 CFR 147 - State of Michigan Underground Injection Control (UIC) Class II Program; Primacy Approval 03/19/2021National
Proposed Regulations 40 CFR 147 - State of Michigan Underground Injection Control (UIC) Class II Program; Primacy Approval 03/19/2021National
Final Regulations 40 CFR 147 - State of Michigan Underground Injection Control (UIC) Class II Program; Primacy Approval 06/17/2021National
Final Regulations 40 CFR 147 - State of Michigan Underground Injection Control (UIC) Class II Program; Primacy Approval 07/28/2022National
Proposed Regulations 40 CFR 147 - State of New Mexico Underground Injection Control Program; Primacy Revisions 10/13/2020National
Proposed Regulations 40 CFR 147 - State of North Dakota Underground Injection Control Program; Class I, III, IV, and V Primacy Revisions 12/04/2018National
Final Regulations 40 CFR 147 - State of North Dakota Underground Injection Control Program; Class I, III, IV, and V Primacy Revisions 04/15/2019National
Notices 40 CFR 147 - Underground Injection Control (UIC) Program Revision; Washington 03/08/2013National
Proposed Regulations 40 CFR 147 - Wyoming Underground Injection Control Program; Class VI Primacy 04/14/2020National
Final Regulations 40 CFR 147 - Wyoming Underground Injection Control Program; Class VI Primacy 10/09/2020National
Final Regulations 40 CFR 47 - State of New Mexico Underground Injection Control Program; Primacy Revisions 01/03/2022National
Guidance Documents A Review of Contaminant Occurrence of Public Water Systems Related to Class V Injection Wells (Draft)  National
Guidance Documents Class I Underground Injection Control Program: Study of the Risks Associated with Class I Underground Injection Wells  National
Guidance Documents Class V Injection Wells - Notice of Final Determination  National
Guidance Documents Class VI Program: Financial Responsibility Guidance  National
Guidance Documents EPA Fact Sheet: Implementation of the Requirements for Oil and Gas Hydraulic Fracturing Activities Using Diesel Fuels  National
Guidance Documents Financial Responsibility Guidance for Owners and Operators of Class II Oil- and Gas-Related Injection Wells  National
Guidance Documents Geologic Sequestration of Carbon Dioxide: Underground Injection Control Program Class VI Well Construction Guidance  National
Notices Hazardous Waste Injection Restrictions; Petition for Exemption-Blanchard Refining Company LLC 07/17/2013National
Guidance Documents Hydraulic Fracturing Draft Study Plan  National
Notices Hydraulic Fracturing Research Related to Drinking Water Resources 11/09/2012National
Notices North Dakota Underground Injection Control Program Revision 08/09/2013National
Guidance Documents Protecting Drinking Water Through Underground Injection Control  National
Notices Science Advisory Board Staff Office Request for Nominations of Experts for the SAB Hydraulic Fracturing Advisory Panel 08/21/2012National
Guidance Documents Technical Program Overview: Underground Injection Control Regulations  National
Forms Underground Injection Control Forms  National
Notices Underground Injection Control Program; Hazardous Waste Injection Restrictions; Petition for Exemption--Class I Hazardous Waste Injection; BASF Corporation Freeport, Texas 04/18/2013National
Notices Underground Injection Control Program; Hazardous Waste Injection Restrictions; Petition for Exemption--Class I Hazardous Waste Injection; Cornerstone Chemical Company, Waggaman, LA 08/30/2012National
Notices Underground Injection Control Program; Hazardous Waste Injection Restrictions; Petition for Exemption--Class I Hazardous Waste Injection; Mosaic Fertilizer, LLC Uncle Sam, LA 12/17/2013National
Regulatory Analysis Underground Injection Wells  National
Questions & Answers What are the requirements for meeting Class II Water Injection Well Standards under the Clean Water Act? 10/14/2005National
Guidance Documents When Are Storm Water Discharges Regulated as Class V Wells?  National
Guidance Documents When is a Septic System Regulated as a Class V Well?  National
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