[Code of Federal Regulations] [Title 40, Volume 29] [Revised as of July 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR466.20] [Page 608] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 466_PORCELAIN ENAMELING POINT SOURCE CATEGORY--Table of Contents Subpart B_Cast Iron Basis Material Subcategory Sec. 466.20 Applicability; description of the cast iron basis material subcategory. This subpart applies to discharges to waters of the United States and introductions of pollutants into publicly owned treatment works from porcelain enameling of cast iron basis materials.