Credential Study Guides
NEHA Credential Study Guides have been developed by industry professionals to help prepare candidates for credential exams. We suggest the following manuals but they are not meant to be the only study reference for candidates in order to achieve a passing score. Candidates should look at all study references, depending on their work experience and education, in order to achieve a passing score.
REHS / RS Credential
REHS/RS Study Guide (Fourth Edition)
CP-FS Manual, (Third Edition)
CCFS Manual (Second Edition)
Installation of Wastewater Treatment Systems (Currently Unavailable)