40 CFR 1.21: General.

EPA Headquarters is comprised of:

(a) The Office of the Administrator;

(b) Two Associate Administrators and four staff offices which advise the Administrator on cross-cutting Agency headquarters and regional issues and conduct programs with respect to EPA's interface with other national and international governmental organizations;

(c) The Office of Inspector General;

(d) The Office of General Counsel; and

(e) Nine operational offices, each headed by an Assistant Administrator, responsible for carrying out EPA's major environmental and administrative programs.