CFR›Title 40›Chapter I›Part 451 ContainsSections 451.1–451.3; Subparts A–BCorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 PART 451—CONCENTRATED AQUATIC ANIMAL PRODUCTION POINT SOURCE CATEGORY Contents 451.1 § 451.1 General applicability. 451.2 § 451.2 General definitions. 451.3 § 451.3 General reporting requirements. A Subpart A—Flow-Through and Recirculating Systems Subcategory Sections 451.10–451.14 B Subpart B—Net Pen Subcategory Sections 451.20–451.24 Authority7 U.S.C. 135 et seq., 136-136y; 15 U.S.C. 2001, 2003, 2005, 2006, 2601-2671, 21 U.S.C. 331j, 346a, 348; 31 U.S.C. 9701; 33 U.S.C. 1251 et seq., 1311, 1313d, 1314, 1318, 1321, 1326, 1330, 1342, 1344, 1345(d) and (e), 1361; 42 U.S.C. 241, 242b, 243, 246, 300f, 300g, 300g-1, 300g-2, 300g-3, 300g-4, 300g-5, 300g-6, 300j-2, 300j-3, 300j-4, 300j-9, 1857 et seq., 6901-6992k, 7401-7671q, 7542, 9601-9657, 11023, 11048; E.O. 11735, 38 FR 21243, 3 CFR, 1971-1975 Comp., 973.Source69 FR 51927, Aug. 23, 2004, unless otherwise noted. Previous 450 Part 450—Construction and Development Point Source Category Next 454 Part 454—Gum and Wood Chemicals Manufacturing Point Source Category