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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 40
Chapter I
Part 131
Subpart C - Subpart C—Procedures for Review and Revision of Water Quality Standards
§ 131.20 - State review and revision of water quality standards.
§ 131.21 - EPA review and approval of water quality standards.
§ 131.22 - EPA promulgation of water quality standards.
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