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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Jun 14, 2025
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Title 40
Chapter I
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
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