RIN stands for "Regulation Identifier Number." A RIN is assigned by the Regulatory Information Service Center, a component of the U.S. General Services Administration, to identify each rule listed in EPA’s Semiannual Regulatory Agenda and Annual Regulatory Plan. Also, RINs are included in the headings of our rules when they are published in the Federal Register to make it easier for you to track our actions.

An example of an EPA RIN is 2050-AG37. It is composed of two parts. The first part (i.e., 2050) identifies which office within EPA is in charge of the action. In this case, it is the Office of Land and Emergency Management. The second part (i.e., AG37) is an alpha-numeric code automatically generated as rules are assigned a RIN.