Credential Study Guides

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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)


ADDITIONAL REHS/RS Credential Study References



CP-FS Credential 

NEHA's (CP-FS) Manual (Third Edition) - Study Guide
CP-FS Manual,  (Third Edition)





CCFS Credential

Certified in Comprehensive Food Safety (CCFS) Manual
CCFS Manual (Second Edition)


ADDITIONAL CCFS Credential Study References


CIOWTS Credential

Installation of Wastewater Treatment Systems
Installation of Wastewater Treatment Systems (Currently Unavailable)


Additional CIOWTS Credential Study References


To purchase credential study guides, please contact Trisha Bramwell,, 303.802.2166. To learn more about credentialing, e-mail