Subpart B. Establishment of Water Quality Standards

• § 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.