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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
All Titles
Title 40
Chapter I
Part 144
Subpart C - Subpart C—Authorization of Underground Injection by Rule
§ 144.21 -
§ 144.22 - Existing Class II enhanced recovery and hydrocarbon storage wells.
§ 144.23 - Class IV wells.
§ 144.24 - Class V wells.
§ 144.25 - Requiring a permit.
§ 144.26 - Inventory requirements.
§ 144.27 - Requiring other information.
§ 144.28 - Requirements for Class I, II, and III wells authorized by rule.
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