Part 131 — Water Quality Standards

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• Subpt. A General Provisions §§131.1 to 131.8
• Subpt. B Establishment of Water Quality Standards §§131.9 to 131.15
• Subpt. C Procedures for Review and Revision of Water Quality Standards §§131.20 to 131.22
• Subpt. D Federally Promulgated Water Quality Standards §§131.31 to 131.48