[Code of Federal Regulations] [Title 40, Volume 21] [Revised as of July 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR158.180] [Page 97] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 158--DATA REQUIREMENTS FOR REGISTRATION--Table of Contents Subpart C--Product Chemistry Data Requirements Sec. 158.180 Enforcement analytical method. An analytical method suitable for enforcement purposes must be provided for each active ingredient in the product and for each other ingredient or impurity that is determined to be toxicologically significant.