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December 2025
Journal of Environmental Health Volume 89, Number 5 View the Full Issue in English or Spanish View the Issue Indexed on ScholasticaAbout the Cover Radon causes an estimated 21,000 lung cancer deaths annually in the U.S. Despite availab...
REHS/RS Credential Reciprocity
If you hold a state REHS or RS credential, you may be eligible to receive the ßÏÀÖÔ° REHS/RS credential without re-examination (reciprocity).EligibilityTo be eligible for reciprocity you must:Have a valid, current state registration; andHave a bac...
State Exams
The following information is for state administrators and/or candidates ordering an exam to become a state-appointed Registered Sanitarian (RS), Registered Environmental Health Specialist (REHS), Licensed Environmental Health Professional (LEHP)...
REHS/RS Study Materials
Review these study references that are recommended to assist candidates in preparing for the Registered Environmental Health Specialist/Registered Sanitarian (REHS/RS) credential exam.Practice Exam Our practice exam for the REHS/RS credential ha...
REHS/RS Credential Exam Content & Scores
The REHS/RS exam consists of two parts with a total of 225 multiple choice questions.Part 1 asks 113 questionsPart 2 asks 112 questionsCandidates have three hours and 40 minutes to complete the entire exam or one hour and 50 minutes for each par...
REHS/RS Credential Eligibility & Application
Eligibility Requirements Candidate must meet all of the criteria for Track A, Track B, or Track C to be eligible to apply for the REHS/RS exam. Track A – Environmental Health Degree Candidates mus...
Registered Environmental Health Specialist/Registered Sanitarian Credential
The REHS/RS is our most predominant credential. Professionals who hold this credential demonstrate competency in an impressive range of environmental health topics including vector control, water quality, hazardous materials, air quality, bu...