Registered Environmental Health Specialist (REHS) Practice Test

Prerequisites are set by the credentialing body, NEHA, and often include a bachelor's degree from an accredited college or university with a minimum of 30 semester hours in natural, physical, or biological sciences. Most candidates are also required to have two or more years of full-time professional experience in environmental health. Some jurisdictions may have specific, additional requirements. It is essential to verify the exact prerequisites with NEHA or your local/state health department, as they serve as the credentialing agents.

The REHS exam is a computer-based test consisting of approximately 200 multiple-choice questions. The questions are drawn from the eight domains outlined in the official exam blueprint: Drinking Water Quality, Emergency Response, Environmental Investigation, Food Safety and Sanitation, Housing and Community Environments, Recreational Water, Solid and Hazardous Waste, and Wastewater Management. The exam is scored on a scaled basis, with a passing score typically set at 75% (or 150 on a 200-point scale). The scaled scoring accounts for minor variations in difficulty across different exam forms.

REHS credential holders are positioned for advanced career paths in both public and private sectors. In public health agencies, common progressions include roles such as Senior Environmental Health Specialist, Program Manager, Division Director, and ultimately Director of Environmental Health or Public Health. In the private sector, opportunities expand into corporate environmental compliance management, consulting firm leadership, hospitality safety management, and regulatory affairs for industries like food manufacturing or waste management. The credential is a recognized benchmark for expertise, often leading to increased supervisory responsibility, higher salary brackets, and greater influence in policy development.

Yes, the REHS/RS credential is the most nationally recognized and portable certification in the environmental health profession. It is endorsed by the U.S. Department of Defense and accepted by most state and local health departments. The certification requires renewal every two years to maintain active status. Renewal mandates the completion of a specified number of continuing education contact hours (typically 24-48 hours per biennium) to ensure professionals stay current with evolving science, technology, and regulations.

The REHS is a broad, comprehensive credential covering all major domains of environmental health practice. In contrast, the CP-FS, while also administered by NEHA, is a specialized certification focused exclusively on food safety and protection. The REHS encompasses food safety as one of its eight core domains but also validates expertise in water quality, waste management, housing, and emergency response. The REHS is generally considered the pinnacle credential for generalist environmental health practitioners, while specialized credentials like the CP-FS complement it for professionals focusing on a specific niche.