U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 40Chapter IPart 146Subpart C - Subpart C—Criteria and Standards Applicable to Class II Wells
View all text of Subpart C [§ 146.21 - § 146.24]
§ 146.21 - Applicability.

This subpart establishes criteria and standards for underground injection control programs to regulate Class II wells.

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