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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 A - Subpart A—General Provisions
§ 131.1 - Scope.
§ 131.2 - Purpose.
§ 131.3 - Definitions.
§ 131.4 - State authority.
§ 131.5 - EPA authority.
§ 131.6 - Minimum requirements for water quality standards submission.
§ 131.7 - Dispute resolution mechanism.
§ 131.8 - Requirements for Indian Tribes to administer a water quality standards program.
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