On May 8, 2013, EPA published a final rule amending 40 CFR Part 158, the section of the regulations setting forth the data requirements that support an application to register a pesticide product. This final rule, which is codified as 40 CFR Part 158 Subpart W (158W), contains the data requirements specifically applicable to antimicrobial pesticides. The rule was effective starting on July 8, 2013. On April 28, 2015, EPA issued a letter to pesticide registrants to summarize how the Agency has been implementing 158W with respect to existing registered antimicrobial pesticides, as well as new and pending antimicrobial pesticide applications. See more about data requirements for pesticide registration.

• 158W Implementation Letter (PDF)(3 pp, 466 K)