Which organization requires employers to post a safety poster in the workplace?

The organization that requires employers to post a safety poster in the workplace is OSHA, the Occupational Safety and Health Administration. OSHA mandates that employers display the "OSHA Job Safety and Health: It's the Law" poster to inform workers of their rights and responsibilities under the Occupational Safety and Health Act. This poster serves to educate employees about workplace safety and health issues, emphasizing their right to work in environments that are free from recognized hazards.

OSHA's requirements are part of its broader mandate to ensure safe and healthy working conditions for employees across various industries. By requiring the posting of this safety poster, OSHA aims to promote awareness and compliance among both employers and employees regarding health and safety standards.

The other organizations listed play significant roles in public health and safety but do not have the specific requirement for posting safety information in the workplace as outlined by OSHA. For example, the EPA (Environmental Protection Agency) focuses on environmental protection; the CDC (Centers for Disease Control and Prevention) addresses public health issues, including disease prevention; and NIOSH (National Institute for Occupational Safety and Health) conducts research and makes recommendations for preventing work-related injuries and illnesses, but it does not enforce workplace safety regulations or require specific posters to be displayed.