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Regulations last checked for updates: May 17, 2025
Title 40 - Protection of Environment last revised: Nov 17, 2025
All Titles
Title 40
Chapter I
Part 131
Subpart B - Subpart B—Establishment of Water Quality Standards
§ 131.9 - Protection of Tribal reserved rights.
§ 131.10 - Designation of uses.
§ 131.11 - Criteria.
§ 131.12 - Antidegradation policy and implementation methods.
§ 131.13 - General policies.
§ 131.14 - Water quality standards variances.
§ 131.15 - Authorizing the use of schedules of compliance for water quality-based effluent limits in NPDES permits.
authority:
33 U.S.C. 1251
source:
48 FR 51405, Nov. 8, 1983, unless otherwise noted.
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