CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS (Parts 400–471) > PART 406—GRAIN MILLS POINT SOURCE CATEGORY > SUBPART I—Ready-to-Eat Cereal Subcategory (§406.90 to §406.97) > 406.91—Specialized definitions.