40 CFR 131.10 : Protection Of Environment (§ 1.1 To Parts 1851-1899) — (Parts 100-103 To § 135.13) — Environmental Protection Agency (Continued) (Parts 100-103 To § 135.13) — Water Programs (Parts 100-103 To § 135.13) — Water Quality Standards (§ 131.1 To § 131.44) — Establishment Of Water Quality Standards (§ 131.10 To § 131.15) — Designation of uses.