Section 5(a) of the Inspector General Act of 1978, as amended, requires each Inspector General to issue semiannual reports to Congress and include an identification of each significant recommendation described in previous semiannual reports on which corrective action has not been completed. The Office of Inspector General (OIG) prepares the Compendium of Unimplemented Recommendations (Compendium) to satisfy this requirement. The Compendium highlights for U.S. Environmental Protection Agency (EPA) management those significant recommendations that have remained unimplemented past the date agreed upon by EPA and the OIG. It also provides a listing of all of the other significant recommendations with future completion dates. This Compendium is being issued in conjunction with the OIG Semiannual Report to Congress for the reporting period April 1, 2011, through September 30, 2011. The Compendium helps Agency management stay informed about EPAs outstanding commitments, and its progress in taking agreed-upon corrective actions on OIG recommendations to improve programs and operations.