Federal OSHA jurisdiction over private sector employers
The District of Columbia does not operate an OSHA-approved state plan. Federal OSHA directly covers most private sector employers and workers in the District under the Occupational Safety and Health Act of 1970 (29 U.S.C. § 651 et seq.). State and local government employees in the District are not covered by federal OSHA.
Source: OSHA Coverage (osha.gov)
D.C. government employee workplace safety program
D.C. government employees are not covered by federal OSHA. Although the D.C. Council enacted a comprehensive occupational safety and health statute in 1989 (D.C. Law 7-186, codified at D.C. Code Title 32, Chapter 11), that statute has never taken effect because it is contingent on approval of a state plan by the U.S. Secretary of Labor under 29 U.S.C. § 667—approval that has not been obtained. The District's Office of Risk Management (ORM) provides consultation services to D.C. agencies, including assistance with safety program development based on federal OSHA standards, annual site inspections, and accident investigations.
Source: D.C. Code § 32-1124 | ORM Occupational Safety and Health