U.S. Code of Federal Regulations

Regulations most recently checked for updates: Oct 30, 2025

All TitlesTitle 40Chapter IPart 131Subpart 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.
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