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Code of Federal Regulations
C.F.R. Title 40—Protection of Environment
CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER D—WATER PROGRAMS
PART 131—WATER QUALITY STANDARDS
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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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