In October 2006, Congress passed Section 550 of the DHS Appropriations Act of 2007, Pub. L. 109-295, authorizing and requiring the Department of Homeland Security (DHS) to regulate security at chemical facilities that DHS determines, in its discretion, are high-risk. To implement this authority, DHS issued the Chemical Facility Anti-Terrorism Standards regulation (CFATS) in 2007. Under CFATS, facilities that have been finally determined by DHS to be high-risk are required to develop and implement Site Security Plans (SSPs) or Alternative Security Programs (ASPs) that meet applicable risk-based performance standards (RBPS).  This fact sheet outlines what those standards and how to complie to those standards.