Subpart A [§ 146.1 - § 146.10] - Subpart A—General Provisions

Subpart B [§ 146.11 - § 146.16] - Subpart B—Criteria and Standards Applicable to Class I Wells

Subpart C [§ 146.21 - § 146.24] - Subpart C—Criteria and Standards Applicable to Class II Wells

Subpart D [§ 146.31 - § 146.34] - Subpart D—Criteria and Standards Applicable to Class III Wells

Subpart E - Subpart E—Criteria and Standards Applicable to Class IV Injection Wells [Reserved]

Subpart F [§ 146.51 - § 146.51] - Subpart F—Criteria and Standards Applicable to Class V Injection Wells

Subpart G [§ 146.61 - § 146.73] - Subpart G—Criteria and Standards Applicable to Class I Hazardous Waste Injection Wells

Subpart H [§ 146.81 - § 146.95] - Subpart H—Criteria and Standards Applicable to Class VI Wells