Subpart A [§ 125.1 - § 125.3] - Subpart A—Criteria and Standards for Imposing Technology-Based Treatment Requirements Under Sections 301(b) and 402 of the Act

Subpart B [§ 125.10 - § 125.11] - Subpart B—Criteria for Issuance of Permits to Aquaculture Projects

Subpart C - Subpart C [Reserved]

Subpart D [§ 125.30 - § 125.32] - Subpart D—Criteria and Standards for Determining Fundamentally Different Factors Under Sections 301(b)(1)(A), 301(b)(2) (A) and (E) of the Act

Subpart E - Subpart E—Criteria for Granting Economic Variances From Best Available Technology Economically Achievable Under Section 301(c) of the Act [Reserved]

Subpart F - Subpart F—Criteria for Granting Water Quality Related Variances Under Section 301(g) of the Act [Reserved]

Subpart G [§ 125.56 - § 125.68] - Subpart G—Criteria for Modifying the Secondary Treatment Requirements Under Section 301(h) of the Clean Water Act

Subpart H [§ 125.70 - § 125.73] - Subpart H—Criteria for Determining Alternative Effluent Limitations Under Section 316(a) of the Act

Subpart I [§ 125.80 - § 125.89] - Subpart I—Requirements Applicable to Cooling Water Intake Structures for New Facilities Under Section 316(b) of the Act

Subpart J [§ 125.90 - § 125.99] - Subpart J—Requirements Applicable to Cooling Water Intake Structures for Existing Facilities Under Section 316(b) of the Clean Water Act

Subpart K - Subpart K [Reserved]

Subpart L - Subpart L—Criteria and Standards for Imposing Conditions for the Disposal of Sewage Sludge Under Section 405 of the Act [Reserved]

Subpart M [§ 125.120 - § 125.124] - Subpart M—Ocean Discharge Criteria

Subpart N [§ 125.130 - § 125.139] - Subpart N—Requirements Applicable to Cooling Water Intake Structures for New Offshore Oil and Gas Extraction Facilities Under Section 316(b) of the Act