Justice Manual § 5-6.111

The Environmental Defense Section has Departmental responsibility for defending actions brought against the Administrator of the Environmental Protection Agency, and his or her subordinate officials, and against the Secretary of the Army, the Chief of Engineers of the United States Army, and their subordinate officials, challenging administrative actions which those officials have taken or failed to take under the statutes set forth in JM 5-6.130. Such actions may take the form of (a) challenges to regulations promulgated by these officials, (b) challenges to the propriety of the issuance or denial of permits, (c) assertions that actions required by law have not been taken, (d) challenges to measures taken or not taken with regard to administration or enforcement of the statutes listed in JM 5-6.130, and (e) any other defensive matters relating to the agencies' activities under the statutes listed in JM 5-6.130.

Additionally, the Environmental Defense Section has Departmental responsibility for litigation directed against any other federal agency or official alleged to have violated any duties under the statutes listed in JM 5-6.130; litigation directed at federal installations, properties, and activities charged with violating applicable discharge or emissions limitations, or other federal, state or local pollution laws; and suits or claims alleging that a federal agency is a liable party under the Comprehensive Environmental Response, Compensation, and Liability Act, 42 U.S.C. § 9601.