Part 131. PART 131—WATER QUALITY STANDARDS

• SUBPART A [§ 131.1 - § 131.8] - Subpart A—General Provisions
• SUBPART B [§ 131.9 - § 131.15] - Subpart B—Establishment of Water Quality Standards
• SUBPART C [§ 131.20 - § 131.22] - Subpart C—Procedures for Review and Revision of Water Quality Standards
• SUBPART D [§ 131.31 - § 131.47] - Subpart D—Federally Promulgated Water Quality Standards